[char-misc-next 1/5 RESEND] mei: add mei_hbuf_acquire wrapper

[char-misc-next 1/5 RESEND] mei: add mei_hbuf_acquire wrapper

[Tomas Winkler]

A client has to acquire host buffer
before writing, we add lock like wrapper
to replace the code snippet

if (dev->hbuf_is_ready)
        dev->hbuf_is_ready = false;

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/misc/mei/amthif.c    |  7 +-----
 drivers/misc/mei/client.c    | 56 ++++++++++++++++++++++++++++----------------
 drivers/misc/mei/hw-me.c     |  2 ++
 drivers/misc/mei/hw-txe.c    | 17 +++++---------
 drivers/misc/mei/interrupt.c |  6 ++---
 drivers/misc/mei/mei_dev.h   |  2 ++
 drivers/misc/mei/wd.c        | 14 +++++------
 7 files changed, 57 insertions(+), 47 deletions(-)

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index 61275e6..e7ba880 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -296,9 +296,8 @@ static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb)
 	if (ret < 0)
 		return ret;
 
-	if (ret && dev->hbuf_is_ready) {
+	if (ret && mei_hbuf_acquire(dev)) {
 		ret = 0;
-		dev->hbuf_is_ready = false;
 		if (cb->request_buffer.size > mei_hbuf_max_len(dev)) {
 			mei_hdr.length = mei_hbuf_max_len(dev);
 			mei_hdr.msg_complete = 0;
@@ -330,10 +329,6 @@ static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb)
 			list_add_tail(&cb->list, &dev->write_list.list);
 		}
 	} else {
-		if (!dev->hbuf_is_ready)
-			dev_dbg(&dev->pdev->dev, "host buffer is not empty");
-
-		dev_dbg(&dev->pdev->dev, "No flow control credentials, so add iamthif cb to write list.\n");
 		list_add_tail(&cb->list, &dev->write_list.list);
 	}
 	return 0;
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index e443bf1..286bc57 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -371,6 +371,23 @@ void mei_host_client_init(struct work_struct *work)
 	mutex_unlock(&dev->device_lock);
 }
 
+/**
+ * mei_hbuf_acquire: try to acquire host buffer
+ *
+ * @dev: the device structure
+ * returns true if host buffer was acquired
+ */
+bool mei_hbuf_acquire(struct mei_device *dev)
+{
+	if (!dev->hbuf_is_ready) {
+		dev_dbg(&dev->pdev->dev, "hbuf is not ready\n");
+		return false;
+	}
+
+	dev->hbuf_is_ready = false;
+
+	return true;
+}
 
 /**
  * mei_cl_disconnect - disconnect host client from the me one
@@ -402,8 +419,7 @@ int mei_cl_disconnect(struct mei_cl *cl)
 		return -ENOMEM;
 
 	cb->fop_type = MEI_FOP_CLOSE;
-	if (dev->hbuf_is_ready) {
-		dev->hbuf_is_ready = false;
+	if (mei_hbuf_acquire(dev)) {
 		if (mei_hbm_cl_disconnect_req(dev, cl)) {
 			rets = -ENODEV;
 			cl_err(dev, cl, "failed to disconnect.\n");
@@ -503,9 +519,8 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
 
 	cb->fop_type = MEI_FOP_CONNECT;
 
-	if (dev->hbuf_is_ready && !mei_cl_is_other_connecting(cl)) {
-		dev->hbuf_is_ready = false;
-
+	/* run hbuf acquire last so we don't have to undo */
+	if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
 		if (mei_hbm_cl_connect_req(dev, cl)) {
 			rets = -ENODEV;
 			goto out;
@@ -663,8 +678,7 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
 		goto err;
 
 	cb->fop_type = MEI_FOP_READ;
-	if (dev->hbuf_is_ready) {
-		dev->hbuf_is_ready = false;
+	if (mei_hbuf_acquire(dev)) {
 		if (mei_hbm_cl_flow_control_req(dev, cl)) {
 			cl_err(dev, cl, "flow control send failed\n");
 			rets = -ENODEV;
@@ -799,21 +813,29 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
 
 
 	cb->fop_type = MEI_FOP_WRITE;
+	cb->buf_idx = 0;
+	cl->writing_state = MEI_IDLE;
+
+	mei_hdr.host_addr = cl->host_client_id;
+	mei_hdr.me_addr = cl->me_client_id;
+	mei_hdr.reserved = 0;
+	mei_hdr.msg_complete = 0;
+	mei_hdr.internal = cb->internal;
 
 	rets = mei_cl_flow_ctrl_creds(cl);
 	if (rets < 0)
 		goto err;
 
-	/* Host buffer is not ready, we queue the request */
-	if (rets == 0 || !dev->hbuf_is_ready) {
-		cb->buf_idx = 0;
-		/* unseting complete will enqueue the cb for write */
-		mei_hdr.msg_complete = 0;
+	if (rets == 0) {
+		cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
+		rets = buf->size;
+		goto out;
+	}
+	if (!mei_hbuf_acquire(dev)) {
+		cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
 		rets = buf->size;
 		goto out;
 	}
-
-	dev->hbuf_is_ready = false;
 
 	/* Check for a maximum length */
 	if (buf->size > mei_hbuf_max_len(dev)) {
@@ -824,12 +846,6 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
 		mei_hdr.msg_complete = 1;
 	}
 
-	mei_hdr.host_addr = cl->host_client_id;
-	mei_hdr.me_addr = cl->me_client_id;
-	mei_hdr.reserved = 0;
-	mei_hdr.internal = cb->internal;
-
-
 	rets = mei_write_message(dev, &mei_hdr, buf->data);
 	if (rets)
 		goto err;
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 847c9e5..b0c42d6 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -513,6 +513,8 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
 		}
 	}
 
+	dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
+
 	rets = mei_irq_write_handler(dev, &complete_list);
 
 	dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c
index 19579e5..ab0442e 100644
--- a/drivers/misc/mei/hw-txe.c
+++ b/drivers/misc/mei/hw-txe.c
@@ -604,7 +604,6 @@ static int mei_txe_write(struct mei_device *dev,
 		mei_txe_input_payload_write(dev, i + 1, reg);
 	}
 
-	dev->hbuf_is_ready = false;
 	/* Set Input-Doorbell */
 	mei_txe_input_doorbell_set(hw);
 
@@ -982,20 +981,16 @@ irqreturn_t mei_txe_irq_thread_handler(int irq, void *dev_id)
 		dev->hbuf_is_ready = true;
 
 	if (hw->aliveness && dev->hbuf_is_ready) {
-		/* if SeC did not complete reading the written data by host */
-		if (!mei_txe_is_input_ready(dev)) {
-			dev_dbg(&dev->pdev->dev, "got Input Ready Int, but SEC_IPC_INPUT_STATUS_RDY is 0.\n");
-			goto end;
-		}
 
+		/* get the real register value */
+		dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
 		rets = mei_irq_write_handler(dev, &complete_list);
-		if (rets)
-			dev_err(&dev->pdev->dev,
-				"mei_irq_write_handler ret = %d.\n", rets);
+		if (rets && rets != -EMSGSIZE)
+			dev_err(&dev->pdev->dev, "mei_irq_write_handler ret = %d.\n",
+				rets);
+		dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
 	}
 
-
-
 	mei_irq_compl_handler(dev, &complete_list);
 
 end:
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 6c4597e..aed03ef 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -446,10 +446,10 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 	s32 slots;
 	int ret;
 
-	if (!mei_hbuf_is_ready(dev)) {
-		dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
+
+	if (!mei_hbuf_acquire(dev))
 		return 0;
-	}
+
 	slots = mei_hbuf_empty_slots(dev);
 	if (slots <= 0)
 		return -EMSGSIZE;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 030b29e..52499bc 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -630,6 +630,8 @@ static inline int mei_count_full_read_slots(struct mei_device *dev)
 	return dev->ops->rdbuf_full_slots(dev);
 }
 
+bool mei_hbuf_acquire(struct mei_device *dev);
+
 #if IS_ENABLED(CONFIG_DEBUG_FS)
 int mei_dbgfs_register(struct mei_device *dev, const char *name);
 void mei_dbgfs_deregister(struct mei_device *dev);
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
index 8c30282..afe976a 100644
--- a/drivers/misc/mei/wd.c
+++ b/drivers/misc/mei/wd.c
@@ -158,9 +158,8 @@ int mei_wd_stop(struct mei_device *dev)
 	if (ret < 0)
 		goto out;
 
-	if (ret && dev->hbuf_is_ready) {
+	if (ret && mei_hbuf_acquire(dev)) {
 		ret = 0;
-		dev->hbuf_is_ready = false;
 
 		if (!mei_wd_send(dev)) {
 			ret = mei_cl_flow_ctrl_reduce(&dev->wd_cl);
@@ -265,8 +264,8 @@ static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
  */
 static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
 {
-	int ret = 0;
 	struct mei_device *dev;
+	int ret;
 
 	dev = watchdog_get_drvdata(wd_dev);
 	if (!dev)
@@ -282,10 +281,12 @@ static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
 
 	dev->wd_state = MEI_WD_RUNNING;
 
+	ret = mei_cl_flow_ctrl_creds(&dev->wd_cl);
+	if (ret < 0)
+		goto end;
 	/* Check if we can send the ping to HW*/
-	if (dev->hbuf_is_ready && mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
+	if (ret && mei_hbuf_acquire(dev)) {
 
-		dev->hbuf_is_ready = false;
 		dev_dbg(&dev->pdev->dev, "wd: sending ping\n");
 
 		if (mei_wd_send(dev)) {
@@ -295,8 +296,7 @@ static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
 		}
 
 		if (mei_cl_flow_ctrl_reduce(&dev->wd_cl)) {
-			dev_err(&dev->pdev->dev,
-				"wd: mei_cl_flow_ctrl_reduce() failed.\n");
+			dev_err(&dev->pdev->dev, "wd: mei_cl_flow_ctrl_reduce() failed.\n");
 			ret = -EIO;
 			goto end;
 		}
-- 
1.8.5.3

[char-misc-next 2/5 RESEND] mei: revamp writing slot counting

[Tomas Winkler]

Since txe use doorbell and not circular buffer
we have to cheat in write slot counting, txe always consume all the
slots upon write. In order for it to work we need to track
slots using mei_hbuf_empty_slots() instead of tracking it in mei layer

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/misc/mei/amthif.c    | 19 ++++++-----
 drivers/misc/mei/client.c    | 19 +++++------
 drivers/misc/mei/client.h    |  4 +--
 drivers/misc/mei/hw-me.c     |  2 +-
 drivers/misc/mei/hw-txe.c    | 21 +++++++-----
 drivers/misc/mei/hw-txe.h    |  1 +
 drivers/misc/mei/interrupt.c | 78 +++++++++++++++++---------------------------
 drivers/misc/mei/mei_dev.h   |  4 +--
 8 files changed, 68 insertions(+), 80 deletions(-)

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index e7ba880..bff9a07 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -436,23 +436,23 @@ unsigned int mei_amthif_poll(struct mei_device *dev,
 
 
 /**
- * mei_amthif_irq_write_completed - processes completed iamthif operation.
+ * mei_amthif_irq_write - write iamthif command in irq thread context.
  *
  * @dev: the device structure.
- * @slots: free slots.
  * @cb_pos: callback block.
  * @cl: private data of the file object.
  * @cmpl_list: complete list.
  *
  * returns 0, OK; otherwise, error.
  */
-int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
-				  s32 *slots, struct mei_cl_cb *cmpl_list)
+int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+			 struct mei_cl_cb *cmpl_list)
 {
 	struct mei_device *dev = cl->dev;
 	struct mei_msg_hdr mei_hdr;
 	size_t len = dev->iamthif_msg_buf_size - dev->iamthif_msg_buf_index;
 	u32 msg_slots = mei_data2slots(len);
+	int slots;
 	int rets;
 
 	rets = mei_cl_flow_ctrl_creds(cl);
@@ -469,13 +469,15 @@ int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
 	mei_hdr.reserved = 0;
 	mei_hdr.internal = 0;
 
-	if (*slots >= msg_slots) {
+	slots = mei_hbuf_empty_slots(dev);
+
+	if (slots >= msg_slots) {
 		mei_hdr.length = len;
 		mei_hdr.msg_complete = 1;
 	/* Split the message only if we can write the whole host buffer */
-	} else if (*slots == dev->hbuf_depth) {
-		msg_slots = *slots;
-		len = (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
+	} else if (slots == dev->hbuf_depth) {
+		msg_slots = slots;
+		len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
 		mei_hdr.length = len;
 		mei_hdr.msg_complete = 0;
 	} else {
@@ -485,7 +487,6 @@ int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
 
 	dev_dbg(&dev->pdev->dev, MEI_HDR_FMT,  MEI_HDR_PRM(&mei_hdr));
 
-	*slots -=  msg_slots;
 	rets = mei_write_message(dev, &mei_hdr,
 			dev->iamthif_msg_buf + dev->iamthif_msg_buf_index);
 	if (rets) {
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 286bc57..d3653dc 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -698,27 +698,26 @@ err:
 }
 
 /**
- * mei_cl_irq_write_complete - write a message to device
+ * mei_cl_irq_write - write a message to device
  *	from the interrupt thread context
  *
  * @cl: client
  * @cb: callback block.
- * @slots: free slots.
  * @cmpl_list: complete list.
  *
  * returns 0, OK; otherwise error.
  */
-int mei_cl_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
-				     s32 *slots, struct mei_cl_cb *cmpl_list)
+int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+		     struct mei_cl_cb *cmpl_list)
 {
 	struct mei_device *dev;
 	struct mei_msg_data *buf;
 	struct mei_msg_hdr mei_hdr;
 	size_t len;
 	u32 msg_slots;
+	int slots;
 	int rets;
 
-
 	if (WARN_ON(!cl || !cl->dev))
 		return -ENODEV;
 
@@ -735,6 +734,7 @@ int mei_cl_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
 		return 0;
 	}
 
+	slots = mei_hbuf_empty_slots(dev);
 	len = buf->size - cb->buf_idx;
 	msg_slots = mei_data2slots(len);
 
@@ -743,13 +743,13 @@ int mei_cl_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
 	mei_hdr.reserved = 0;
 	mei_hdr.internal = cb->internal;
 
-	if (*slots >= msg_slots) {
+	if (slots >= msg_slots) {
 		mei_hdr.length = len;
 		mei_hdr.msg_complete = 1;
 	/* Split the message only if we can write the whole host buffer */
-	} else if (*slots == dev->hbuf_depth) {
-		msg_slots = *slots;
-		len = (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
+	} else if (slots == dev->hbuf_depth) {
+		msg_slots = slots;
+		len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
 		mei_hdr.length = len;
 		mei_hdr.msg_complete = 0;
 	} else {
@@ -760,7 +760,6 @@ int mei_cl_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
 	cl_dbg(dev, cl, "buf: size = %d idx = %lu\n",
 			cb->request_buffer.size, cb->buf_idx);
 
-	*slots -=  msg_slots;
 	rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx);
 	if (rets) {
 		cl->status = rets;
diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h
index c8396e5..c11b663 100644
--- a/drivers/misc/mei/client.h
+++ b/drivers/misc/mei/client.h
@@ -102,8 +102,8 @@ int mei_cl_disconnect(struct mei_cl *cl);
 int mei_cl_connect(struct mei_cl *cl, struct file *file);
 int mei_cl_read_start(struct mei_cl *cl, size_t length);
 int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking);
-int mei_cl_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
-				s32 *slots, struct mei_cl_cb *cmpl_list);
+int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+		     struct mei_cl_cb *cmpl_list);
 
 void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb);
 
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index b0c42d6..84165cc 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -354,7 +354,7 @@ static int mei_me_write_message(struct mei_device *dev,
 
 	dw_cnt = mei_data2slots(length);
 	if (empty_slots < 0 || dw_cnt > empty_slots)
-		return -EIO;
+		return -EMSGSIZE;
 
 	mei_me_reg_write(hw, H_CB_WW, *((u32 *) header));
 
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c
index ab0442e..69a5ce7 100644
--- a/drivers/misc/mei/hw-txe.c
+++ b/drivers/misc/mei/hw-txe.c
@@ -565,7 +565,9 @@ static int mei_txe_write(struct mei_device *dev,
 	struct mei_txe_hw *hw = to_txe_hw(dev);
 	unsigned long rem;
 	unsigned long length;
+	int slots = dev->hbuf_depth;
 	u32 *reg_buf = (u32 *)buf;
+	u32 dw_cnt;
 	int i;
 
 	if (WARN_ON(!header || !buf))
@@ -575,11 +577,9 @@ static int mei_txe_write(struct mei_device *dev,
 
 	dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(header));
 
-	if ((length + sizeof(struct mei_msg_hdr)) > PAYLOAD_SIZE) {
-		dev_err(&dev->pdev->dev, "write length exceeded = %ld > %d\n",
-			length + sizeof(struct mei_msg_hdr), PAYLOAD_SIZE);
-		return -ERANGE;
-	}
+	dw_cnt = mei_data2slots(length);
+	if (dw_cnt > slots)
+		return -EMSGSIZE;
 
 	if (WARN(!hw->aliveness, "txe write: aliveness not asserted\n"))
 		return -EAGAIN;
@@ -604,6 +604,9 @@ static int mei_txe_write(struct mei_device *dev,
 		mei_txe_input_payload_write(dev, i + 1, reg);
 	}
 
+	/* after each write the whole buffer is consumed */
+	hw->slots = 0;
+
 	/* Set Input-Doorbell */
 	mei_txe_input_doorbell_set(hw);
 
@@ -631,7 +634,8 @@ static size_t mei_txe_hbuf_max_len(const struct mei_device *dev)
  */
 static int mei_txe_hbuf_empty_slots(struct mei_device *dev)
 {
-	return dev->hbuf_depth;
+	struct mei_txe_hw *hw = to_txe_hw(dev);
+	return hw->slots;
 }
 
 /**
@@ -977,11 +981,12 @@ irqreturn_t mei_txe_irq_thread_handler(int irq, void *dev_id)
 		}
 	}
 	/* Input Ready: Detection if host can write to SeC */
-	if (test_and_clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause))
+	if (test_and_clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause)) {
 		dev->hbuf_is_ready = true;
+		hw->slots = dev->hbuf_depth;
+	}
 
 	if (hw->aliveness && dev->hbuf_is_ready) {
-
 		/* get the real register value */
 		dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
 		rets = mei_irq_write_handler(dev, &complete_list);
diff --git a/drivers/misc/mei/hw-txe.h b/drivers/misc/mei/hw-txe.h
index 857d88c..3d8d6e5 100644
--- a/drivers/misc/mei/hw-txe.h
+++ b/drivers/misc/mei/hw-txe.h
@@ -44,6 +44,7 @@ struct mei_txe_hw {
 	void __iomem *mem_addr[NUM_OF_MEM_BARS];
 	u32 aliveness;
 	u32 readiness;
+	u32 slots;
 
 	wait_queue_head_t wait_aliveness;
 	bool recvd_aliveness;
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index aed03ef..e6151e2 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -165,25 +165,24 @@ static int mei_cl_irq_read_msg(struct mei_device *dev,
  *
  * @cl: client
  * @cb: callback block.
- * @slots: free slots.
  * @cmpl_list: complete list.
  *
  * returns 0, OK; otherwise, error.
  */
 static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
-			s32 *slots, struct mei_cl_cb *cmpl_list)
+				     struct mei_cl_cb *cmpl_list)
 {
 	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
 	int ret;
 
-	u32 msg_slots =
-		mei_data2slots(sizeof(struct hbm_client_connect_response));
+	slots = mei_hbuf_empty_slots(dev);
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_response));
 
-	if (*slots < msg_slots)
+	if (slots < msg_slots)
 		return -EMSGSIZE;
 
-	*slots -= msg_slots;
-
 	ret = mei_hbm_cl_disconnect_rsp(dev, cl);
 
 	cl->state = MEI_FILE_DISCONNECTED;
@@ -201,24 +200,23 @@ static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
  *
  * @cl: client
  * @cb: callback block.
- * @slots: free slots.
  * @cmpl_list: complete list.
  *
  * returns 0, OK; otherwise, error.
  */
 static int mei_cl_irq_close(struct mei_cl *cl, struct mei_cl_cb *cb,
-			s32 *slots, struct mei_cl_cb *cmpl_list)
+			    struct mei_cl_cb *cmpl_list)
 {
 	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
 
-	u32 msg_slots =
-		mei_data2slots(sizeof(struct hbm_client_connect_request));
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
+	slots = mei_hbuf_empty_slots(dev);
 
-	if (*slots < msg_slots)
+	if (slots < msg_slots)
 		return -EMSGSIZE;
 
-	*slots -= msg_slots;
-
 	if (mei_hbm_cl_disconnect_req(dev, cl)) {
 		cl->status = 0;
 		cb->buf_idx = 0;
@@ -242,27 +240,23 @@ static int mei_cl_irq_close(struct mei_cl *cl, struct mei_cl_cb *cb,
  *
  * @cl: client
  * @cb: callback block.
- * @slots: free slots.
  * @cmpl_list: complete list.
  *
  * returns 0, OK; otherwise, error.
  */
 static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
-			   s32 *slots, struct mei_cl_cb *cmpl_list)
+			   struct mei_cl_cb *cmpl_list)
 {
 	struct mei_device *dev = cl->dev;
-	u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
-
+	u32 msg_slots;
+	int slots;
 	int ret;
 
+	msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
+	slots = mei_hbuf_empty_slots(dev);
 
-	if (*slots < msg_slots) {
-		/* return the cancel routine */
-		list_del(&cb->list);
+	if (slots < msg_slots)
 		return -EMSGSIZE;
-	}
-
-	*slots -= msg_slots;
 
 	ret = mei_hbm_cl_flow_control_req(dev, cl);
 	if (ret) {
@@ -283,30 +277,26 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
  *
  * @cl: client
  * @cb: callback block.
- * @slots: free slots.
  * @cmpl_list: complete list.
  *
  * returns 0, OK; otherwise, error.
  */
 static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
-			   s32 *slots, struct mei_cl_cb *cmpl_list)
+			      struct mei_cl_cb *cmpl_list)
 {
 	struct mei_device *dev = cl->dev;
+	u32 msg_slots;
+	int slots;
 	int ret;
 
-	u32 msg_slots =
-		mei_data2slots(sizeof(struct hbm_client_connect_request));
+	msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
+	slots = mei_hbuf_empty_slots(dev);
 
 	if (mei_cl_is_other_connecting(cl))
 		return 0;
 
-	if (*slots < msg_slots) {
-		/* return the cancel routine */
-		list_del(&cb->list);
+	if (slots < msg_slots)
 		return -EMSGSIZE;
-	}
-
-	*slots -=  msg_slots;
 
 	cl->state = MEI_FILE_CONNECTING;
 
@@ -494,13 +484,7 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 				dev_dbg(&dev->pdev->dev, "wd send failed.\n");
 			else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
 				return -ENODEV;
-
 			dev->wd_pending = false;
-
-			if (dev->wd_state == MEI_WD_RUNNING)
-				slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
-			else
-				slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
 		}
 	}
 
@@ -515,28 +499,28 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 		switch (cb->fop_type) {
 		case MEI_FOP_CLOSE:
 			/* send disconnect message */
-			ret = mei_cl_irq_close(cl, cb, &slots, cmpl_list);
+			ret = mei_cl_irq_close(cl, cb, cmpl_list);
 			if (ret)
 				return ret;
 
 			break;
 		case MEI_FOP_READ:
 			/* send flow control message */
-			ret = mei_cl_irq_read(cl, cb, &slots, cmpl_list);
+			ret = mei_cl_irq_read(cl, cb, cmpl_list);
 			if (ret)
 				return ret;
 
 			break;
 		case MEI_FOP_CONNECT:
 			/* connect message */
-			ret = mei_cl_irq_connect(cl, cb, &slots, cmpl_list);
+			ret = mei_cl_irq_connect(cl, cb, cmpl_list);
 			if (ret)
 				return ret;
 
 			break;
 		case MEI_FOP_DISCONNECT_RSP:
 			/* send disconnect resp */
-			ret = mei_cl_irq_disconnect_rsp(cl, cb, &slots, cmpl_list);
+			ret = mei_cl_irq_disconnect_rsp(cl, cb, cmpl_list);
 			if (ret)
 				return ret;
 		default:
@@ -551,11 +535,9 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 		if (cl == NULL)
 			continue;
 		if (cl == &dev->iamthif_cl)
-			ret = mei_amthif_irq_write_complete(cl, cb,
-						&slots, cmpl_list);
+			ret = mei_amthif_irq_write(cl, cb, cmpl_list);
 		else
-			ret = mei_cl_irq_write_complete(cl, cb,
-						&slots, cmpl_list);
+			ret = mei_cl_irq_write(cl, cb, cmpl_list);
 		if (ret)
 			return ret;
 	}
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 52499bc..36640b9 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -515,8 +515,8 @@ struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
 
 void mei_amthif_run_next_cmd(struct mei_device *dev);
 
-int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
-				  s32 *slots, struct mei_cl_cb *cmpl_list);
+int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
+			struct mei_cl_cb *cmpl_list);
 
 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
 int mei_amthif_irq_read_msg(struct mei_device *dev,
-- 
1.8.5.3

[char-misc-next 3/5 RESEND] mei: make return values consistent across the driver

[Tomas Winkler]

From: Alexander Usyskin <alexander.usyskin@intel.com>

1. Propagate ENOTTY  to user space if the client is not present
in the system
2. Use ETIME consistently on timeouts
3. Return EIO on write failures
4. Return ENODEV on recoverable device failures such as resets

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/misc/mei/amthif.c    | 12 +++++-------
 drivers/misc/mei/client.c    | 26 ++++++++++++++------------
 drivers/misc/mei/hbm.c       |  2 +-
 drivers/misc/mei/hw-me.c     |  8 ++++----
 drivers/misc/mei/interrupt.c |  4 ++--
 drivers/misc/mei/main.c      |  2 +-
 drivers/misc/mei/nfc.c       |  6 +++---
 drivers/misc/mei/wd.c        |  6 +++---
 8 files changed, 33 insertions(+), 33 deletions(-)

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index bff9a07..f05d54d 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -78,10 +78,9 @@ int mei_amthif_host_init(struct mei_device *dev)
 
 	i = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
 	if (i < 0) {
-		ret = i;
 		dev_info(&dev->pdev->dev,
-			"amthif: failed to find the client %d\n", ret);
-		return ret;
+			"amthif: failed to find the client %d\n", i);
+		return -ENOTTY;
 	}
 
 	cl->me_client_id = dev->me_clients[i].client_id;
@@ -174,14 +173,13 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
 	/* Only possible if we are in timeout */
 	if (!cl || cl != &dev->iamthif_cl) {
 		dev_dbg(&dev->pdev->dev, "bad file ext.\n");
-		return -ETIMEDOUT;
+		return -ETIME;
 	}
 
 	i = mei_me_cl_by_id(dev, dev->iamthif_cl.me_client_id);
-
 	if (i < 0) {
 		dev_dbg(&dev->pdev->dev, "amthif client not found.\n");
-		return -ENODEV;
+		return -ENOTTY;
 	}
 	dev_dbg(&dev->pdev->dev, "checking amthif data\n");
 	cb = mei_amthif_find_read_list_entry(dev, file);
@@ -222,7 +220,7 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
 			dev_dbg(&dev->pdev->dev, "amthif Time out\n");
 			/* 15 sec for the message has expired */
 			list_del(&cb->list);
-			rets = -ETIMEDOUT;
+			rets = -ETIME;
 			goto free;
 		}
 	}
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index d3653dc..aac7cdb 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -664,7 +664,7 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
 	i = mei_me_cl_by_id(dev, cl->me_client_id);
 	if (i < 0) {
 		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
-		return  -ENODEV;
+		return  -ENOTTY;
 	}
 
 	cb = mei_io_cb_init(cl, NULL);
@@ -852,13 +852,12 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
 	cl->writing_state = MEI_WRITING;
 	cb->buf_idx = mei_hdr.length;
 
-	rets = buf->size;
 out:
 	if (mei_hdr.msg_complete) {
-		if (mei_cl_flow_ctrl_reduce(cl)) {
-			rets = -ENODEV;
+		rets = mei_cl_flow_ctrl_reduce(cl);
+		if (rets < 0)
 			goto err;
-		}
+
 		list_add_tail(&cb->list, &dev->write_waiting_list.list);
 	} else {
 		list_add_tail(&cb->list, &dev->write_list.list);
@@ -868,15 +867,18 @@ out:
 	if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
 
 		mutex_unlock(&dev->device_lock);
-		if (wait_event_interruptible(cl->tx_wait,
-			cl->writing_state == MEI_WRITE_COMPLETE)) {
-				if (signal_pending(current))
-					rets = -EINTR;
-				else
-					rets = -ERESTARTSYS;
-		}
+		rets = wait_event_interruptible(cl->tx_wait,
+				cl->writing_state == MEI_WRITE_COMPLETE);
 		mutex_lock(&dev->device_lock);
+		/* wait_event_interruptible returns -ERESTARTSYS */
+		if (rets) {
+			if (signal_pending(current))
+				rets = -EINTR;
+			goto err;
+		}
 	}
+
+	rets = buf->size;
 err:
 	return rets;
 }
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index a28cc92..9555791 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -161,7 +161,7 @@ int mei_hbm_start_wait(struct mei_device *dev)
 	if (ret <= 0 && (dev->hbm_state <= MEI_HBM_START)) {
 		dev->hbm_state = MEI_HBM_IDLE;
 		dev_err(&dev->pdev->dev, "waiting for mei start failed\n");
-		return -ETIMEDOUT;
+		return -ETIME;
 	}
 	return 0;
 }
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 84165cc..7e769c5 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -244,7 +244,7 @@ static int mei_me_hw_ready_wait(struct mei_device *dev)
 	mutex_lock(&dev->device_lock);
 	if (!err && !dev->recvd_hw_ready) {
 		if (!err)
-			err = -ETIMEDOUT;
+			err = -ETIME;
 		dev_err(&dev->pdev->dev,
 			"wait hw ready failed. status = %d\n", err);
 		return err;
@@ -303,7 +303,7 @@ static bool mei_me_hbuf_is_empty(struct mei_device *dev)
  *
  * @dev: the device structure
  *
- * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise empty slots count
+ * returns -EOVERFLOW if overflow, otherwise empty slots count
  */
 static int mei_me_hbuf_empty_slots(struct mei_device *dev)
 {
@@ -326,7 +326,7 @@ static size_t mei_me_hbuf_max_len(const struct mei_device *dev)
 
 
 /**
- * mei_write_message - writes a message to mei device.
+ * mei_me_write_message - writes a message to mei device.
  *
  * @dev: the device structure
  * @header: mei HECI header of message
@@ -381,7 +381,7 @@ static int mei_me_write_message(struct mei_device *dev,
  *
  * @dev: the device structure
  *
- * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise filled slots count
+ * returns -EOVERFLOW if overflow, otherwise filled slots count
  */
 static int mei_me_count_full_read_slots(struct mei_device *dev)
 {
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index e6151e2..31cb345 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -350,7 +350,7 @@ int mei_irq_read_handler(struct mei_device *dev,
 		dev_err(&dev->pdev->dev, "less data available than length=%08x.\n",
 				*slots);
 		/* we can't read the message */
-		ret = -ERANGE;
+		ret = -EBADMSG;
 		goto end;
 	}
 
@@ -483,7 +483,7 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 			if (mei_wd_send(dev))
 				dev_dbg(&dev->pdev->dev, "wd send failed.\n");
 			else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
-				return -ENODEV;
+				return -EIO;
 			dev->wd_pending = false;
 		}
 	}
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 434242b..49e3bb8 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -340,7 +340,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 
 	id = mei_me_cl_by_id(dev, cl->me_client_id);
 	if (id < 0) {
-		rets = -ENODEV;
+		rets = -ENOTTY;
 		goto out;
 	}
 
diff --git a/drivers/misc/mei/nfc.c b/drivers/misc/mei/nfc.c
index 7626dde..3095fc5 100644
--- a/drivers/misc/mei/nfc.c
+++ b/drivers/misc/mei/nfc.c
@@ -364,7 +364,7 @@ static int mei_nfc_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
 	if (!wait_event_interruptible_timeout(ndev->send_wq,
 				ndev->recv_req_id == ndev->req_id, HZ)) {
 		dev_err(&dev->pdev->dev, "NFC MEI command timeout\n");
-		err = -ETIMEDOUT;
+		err = -ETIME;
 	} else {
 		ndev->req_id++;
 	}
@@ -502,7 +502,7 @@ int mei_nfc_host_init(struct mei_device *dev)
 	i = mei_me_cl_by_uuid(dev, &mei_nfc_info_guid);
 	if (i < 0) {
 		dev_info(&dev->pdev->dev, "nfc: failed to find the client\n");
-		ret = -ENOENT;
+		ret = -ENOTTY;
 		goto err;
 	}
 
@@ -520,7 +520,7 @@ int mei_nfc_host_init(struct mei_device *dev)
 	i = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
 	if (i < 0) {
 		dev_info(&dev->pdev->dev, "nfc: failed to find the client\n");
-		ret = -ENOENT;
+		ret = -ENOTTY;
 		goto err;
 	}
 
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
index afe976a..4644b62 100644
--- a/drivers/misc/mei/wd.c
+++ b/drivers/misc/mei/wd.c
@@ -53,7 +53,7 @@ static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
  *
  * @dev: the device structure
  *
- * returns -ENENT if wd client cannot be found
+ * returns -ENOTTY if wd client cannot be found
  *         -EIO if write has failed
  *         0 on success
  */
@@ -73,7 +73,7 @@ int mei_wd_host_init(struct mei_device *dev)
 	id = mei_me_cl_by_uuid(dev, &mei_wd_guid);
 	if (id < 0) {
 		dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
-		return id;
+		return -ENOTTY;
 	}
 
 	cl->me_client_id = dev->me_clients[id].client_id;
@@ -185,7 +185,7 @@ int mei_wd_stop(struct mei_device *dev)
 		ret = 0;
 	} else {
 		if (!ret)
-			ret = -ETIMEDOUT;
+			ret = -ETIME;
 		dev_warn(&dev->pdev->dev,
 			"wd: stop failed to complete ret=%d.\n", ret);
 	}
-- 
1.8.5.3

[char-misc-next 4/5 RESEND] mei: wd: simplify wd_send command

[Tomas Winkler]

Add reduce credits to wd_send to remove code
repetition and simplify error handling

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
---
 drivers/misc/mei/interrupt.c |  7 +++---
 drivers/misc/mei/wd.c        | 52 +++++++++++++++++++++++---------------------
 2 files changed, 30 insertions(+), 29 deletions(-)

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 31cb345..834220a 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -480,10 +480,9 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 	if (mei_cl_is_connected(&dev->wd_cl)) {
 		if (dev->wd_pending &&
 		    mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
-			if (mei_wd_send(dev))
-				dev_dbg(&dev->pdev->dev, "wd send failed.\n");
-			else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
-				return -EIO;
+			ret = mei_wd_send(dev);
+			if (ret)
+				return ret;
 			dev->wd_pending = false;
 		}
 	}
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
index 4644b62..13bb7a9 100644
--- a/drivers/misc/mei/wd.c
+++ b/drivers/misc/mei/wd.c
@@ -111,13 +111,16 @@ int mei_wd_host_init(struct mei_device *dev)
  * returns 0 if success,
  *	-EIO when message send fails
  *	-EINVAL when invalid message is to be sent
+ *	-ENODEV on flow control failure
  */
 int mei_wd_send(struct mei_device *dev)
 {
+	struct mei_cl *cl = &dev->wd_cl;
 	struct mei_msg_hdr hdr;
+	int ret;
 
-	hdr.host_addr = dev->wd_cl.host_client_id;
-	hdr.me_addr = dev->wd_cl.me_client_id;
+	hdr.host_addr = cl->host_client_id;
+	hdr.me_addr = cl->me_client_id;
 	hdr.msg_complete = 1;
 	hdr.reserved = 0;
 	hdr.internal = 0;
@@ -126,10 +129,24 @@ int mei_wd_send(struct mei_device *dev)
 		hdr.length = MEI_WD_START_MSG_SIZE;
 	else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
 		hdr.length = MEI_WD_STOP_MSG_SIZE;
-	else
+	else {
+		dev_err(&dev->pdev->dev, "wd: invalid message is to be sent, aborting\n");
 		return -EINVAL;
+	}
+
+	ret = mei_write_message(dev, &hdr, dev->wd_data);
+	if (ret) {
+		dev_err(&dev->pdev->dev, "wd: write message failed\n");
+		return ret;
+	}
 
-	return mei_write_message(dev, &hdr, dev->wd_data);
+	ret = mei_cl_flow_ctrl_reduce(cl);
+	if (ret) {
+		dev_err(&dev->pdev->dev, "wd: flow_ctrl_reduce failed.\n");
+		return ret;
+	}
+
+	return 0;
 }
 
 /**
@@ -159,16 +176,9 @@ int mei_wd_stop(struct mei_device *dev)
 		goto out;
 
 	if (ret && mei_hbuf_acquire(dev)) {
-		ret = 0;
-
-		if (!mei_wd_send(dev)) {
-			ret = mei_cl_flow_ctrl_reduce(&dev->wd_cl);
-			if (ret)
-				goto out;
-		} else {
-			dev_err(&dev->pdev->dev, "wd: send stop failed\n");
-		}
-
+		ret = mei_wd_send(dev);
+		if (ret)
+			goto out;
 		dev->wd_pending = false;
 	} else {
 		dev->wd_pending = true;
@@ -289,18 +299,10 @@ static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
 
 		dev_dbg(&dev->pdev->dev, "wd: sending ping\n");
 
-		if (mei_wd_send(dev)) {
-			dev_err(&dev->pdev->dev, "wd: send failed.\n");
-			ret = -EIO;
+		ret = mei_wd_send(dev);
+		if (ret)
 			goto end;
-		}
-
-		if (mei_cl_flow_ctrl_reduce(&dev->wd_cl)) {
-			dev_err(&dev->pdev->dev, "wd: mei_cl_flow_ctrl_reduce() failed.\n");
-			ret = -EIO;
-			goto end;
-		}
-
+		dev->wd_pending = false;
 	} else {
 		dev->wd_pending = true;
 	}
-- 
1.8.5.3

[char-misc-next 5/5 RESEND] mei: wd: fix stop completion failure

[Tomas Winkler]

While running Documentation/watchdog/src/watchdog-simple.c
and quiting by Ctrl-C, fallowing error is displayed:
mei_me 0000:00:16.0: wd: stop failed to complete ret=-512.

The whatchdog core framework is not able to propagate
-ESYSRESTART or -EINTR. Also There is no much sense in
restarting the close system call so instead of using
wait_event_interruptible_timeout we can use wait_event_timeout
with reasonable 10 msecs timeout.

Reported-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/misc/mei/interrupt.c |  2 +-
 drivers/misc/mei/wd.c        | 32 +++++++++++++++++---------------
 2 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 834220a..5aab335 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -474,7 +474,7 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 
 	if (dev->wd_state == MEI_WD_STOPPING) {
 		dev->wd_state = MEI_WD_IDLE;
-		wake_up_interruptible(&dev->wait_stop_wd);
+		wake_up(&dev->wait_stop_wd);
 	}
 
 	if (mei_cl_is_connected(&dev->wd_cl)) {
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
index 13bb7a9..e084adf 100644
--- a/drivers/misc/mei/wd.c
+++ b/drivers/misc/mei/wd.c
@@ -155,9 +155,11 @@ int mei_wd_send(struct mei_device *dev)
  * @dev: the device structure
  * @preserve: indicate if to keep the timeout value
  *
- * returns 0 if success,
- *	-EIO when message send fails
+ * returns 0 if success
+ * on error:
+ *	-EIO    when message send fails
  *	-EINVAL when invalid message is to be sent
+ *	-ETIME  on message timeout
  */
 int mei_wd_stop(struct mei_device *dev)
 {
@@ -173,12 +175,12 @@ int mei_wd_stop(struct mei_device *dev)
 
 	ret = mei_cl_flow_ctrl_creds(&dev->wd_cl);
 	if (ret < 0)
-		goto out;
+		goto err;
 
 	if (ret && mei_hbuf_acquire(dev)) {
 		ret = mei_wd_send(dev);
 		if (ret)
-			goto out;
+			goto err;
 		dev->wd_pending = false;
 	} else {
 		dev->wd_pending = true;
@@ -186,21 +188,21 @@ int mei_wd_stop(struct mei_device *dev)
 
 	mutex_unlock(&dev->device_lock);
 
-	ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
-					dev->wd_state == MEI_WD_IDLE,
-					msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
+	ret = wait_event_timeout(dev->wait_stop_wd,
+				dev->wd_state == MEI_WD_IDLE,
+				msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
 	mutex_lock(&dev->device_lock);
-	if (dev->wd_state == MEI_WD_IDLE) {
-		dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
-		ret = 0;
-	} else {
-		if (!ret)
-			ret = -ETIME;
+	if (dev->wd_state != MEI_WD_IDLE) {
+		/* timeout */
+		ret = -ETIME;
 		dev_warn(&dev->pdev->dev,
 			"wd: stop failed to complete ret=%d.\n", ret);
+		goto err;
 	}
-
-out:
+	dev_dbg(&dev->pdev->dev, "wd: stop completed after %u msec\n",
+			MEI_WD_STOP_TIMEOUT - jiffies_to_msecs(ret));
+	return 0;
+err:
 	return ret;
 }
 
-- 
1.8.5.3