From: Tomas Winkler <tomas.winkler@intel.com>
To: gregkh@linuxfoundation.org
Cc: arnd@arndb.de, linux-kernel@vger.kernel.org,
Alexander Usyskin <alexander.usyskin@intel.com>,
Tomas Winkler <tomas.winkler@intel.com>
Subject: [char-misc-next 10/14] mei: wait for hbm start non-interruptible
Date: Thu, 21 Aug 2014 14:29:19 +0300 [thread overview]
Message-ID: <1408620563-25834-10-git-send-email-tomas.winkler@intel.com> (raw)
In-Reply-To: <1408620563-25834-1-git-send-email-tomas.winkler@intel.com>
From: Alexander Usyskin <alexander.usyskin@intel.com>
We cannot handle user interrupt in context of hbm start
so we only wait for time out which is reasonably short.
1. Add kdoc
2. Rename state to better reflect its function
3. Simplify wait condition and rename
wait_recvd_msg to wait_hbm_start
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/hbm.c | 26 ++++++++++++++++----------
drivers/misc/mei/hbm.h | 6 ++++--
drivers/misc/mei/init.c | 2 +-
drivers/misc/mei/mei_dev.h | 2 +-
4 files changed, 22 insertions(+), 14 deletions(-)
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index cda9141..2968b52 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -172,21 +172,27 @@ bool mei_hbm_cl_addr_equal(struct mei_cl *cl, void *buf)
cl->me_client_id == cmd->me_addr;
}
-
+/**
+ * mei_hbm_start_wait - wait for start response message.
+ *
+ * @dev: the device structure
+ *
+ * returns 0 on success and < 0 on failure
+ */
int mei_hbm_start_wait(struct mei_device *dev)
{
int ret;
- if (dev->hbm_state > MEI_HBM_START)
+
+ if (dev->hbm_state > MEI_HBM_STARTING)
return 0;
mutex_unlock(&dev->device_lock);
- ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
- dev->hbm_state == MEI_HBM_IDLE ||
- dev->hbm_state >= MEI_HBM_STARTED,
+ ret = wait_event_timeout(dev->wait_hbm_start,
+ dev->hbm_state != MEI_HBM_STARTING,
mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
mutex_lock(&dev->device_lock);
- if (ret <= 0 && (dev->hbm_state <= MEI_HBM_START)) {
+ if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
dev->hbm_state = MEI_HBM_IDLE;
dev_err(&dev->pdev->dev, "waiting for mei start failed\n");
return -ETIME;
@@ -227,7 +233,7 @@ int mei_hbm_start_req(struct mei_device *dev)
return ret;
}
- dev->hbm_state = MEI_HBM_START;
+ dev->hbm_state = MEI_HBM_STARTING;
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
return 0;
}
@@ -726,7 +732,7 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
}
if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
- dev->hbm_state != MEI_HBM_START) {
+ dev->hbm_state != MEI_HBM_STARTING) {
dev_err(&dev->pdev->dev, "hbm: start: state mismatch, [%d, %d]\n",
dev->dev_state, dev->hbm_state);
return -EPROTO;
@@ -739,7 +745,7 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
return -EIO;
}
- wake_up_interruptible(&dev->wait_recvd_msg);
+ wake_up(&dev->wait_hbm_start);
break;
case CLIENT_CONNECT_RES_CMD:
@@ -866,7 +872,7 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
dev_dbg(&dev->pdev->dev, "hbm: stop request: message received\n");
dev->hbm_state = MEI_HBM_STOPPED;
if (mei_hbm_stop_req(dev)) {
- dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
+ dev_err(&dev->pdev->dev, "hbm: stop request: failed to send stop request\n");
return -EIO;
}
break;
diff --git a/drivers/misc/mei/hbm.h b/drivers/misc/mei/hbm.h
index 683eb28..80920f0 100644
--- a/drivers/misc/mei/hbm.h
+++ b/drivers/misc/mei/hbm.h
@@ -25,13 +25,15 @@ struct mei_cl;
* enum mei_hbm_state - host bus message protocol state
*
* @MEI_HBM_IDLE : protocol not started
- * @MEI_HBM_START : start request message was sent
+ * @MEI_HBM_STARTING : start request message was sent
+ * @MEI_HBM_STARTED : start reply message was received
* @MEI_HBM_ENUM_CLIENTS : enumeration request was sent
* @MEI_HBM_CLIENT_PROPERTIES : acquiring clients properties
+ * @MEI_HBM_STOPPED : stopping exchange
*/
enum mei_hbm_state {
MEI_HBM_IDLE = 0,
- MEI_HBM_START,
+ MEI_HBM_STARTING,
MEI_HBM_STARTED,
MEI_HBM_ENUM_CLIENTS,
MEI_HBM_CLIENT_PROPERTIES,
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 73ccbb6..9f635be 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -360,7 +360,7 @@ void mei_device_init(struct mei_device *dev, const struct mei_cfg *cfg)
mutex_init(&dev->device_lock);
init_waitqueue_head(&dev->wait_hw_ready);
init_waitqueue_head(&dev->wait_pg);
- init_waitqueue_head(&dev->wait_recvd_msg);
+ init_waitqueue_head(&dev->wait_hbm_start);
init_waitqueue_head(&dev->wait_stop_wd);
dev->dev_state = MEI_DEV_INITIALIZING;
dev->reset_count = 0;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 0922ce8..79124ae 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -443,7 +443,7 @@ struct mei_device {
*/
wait_queue_head_t wait_hw_ready;
wait_queue_head_t wait_pg;
- wait_queue_head_t wait_recvd_msg;
+ wait_queue_head_t wait_hbm_start;
wait_queue_head_t wait_stop_wd;
/*
--
1.9.3
next prev parent reply other threads:[~2014-08-21 11:31 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-21 11:29 [char-misc-next 01/14] mei: use consistently me_addr in the hbm structures Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 02/14] mei: use wrapper for simple hbm client message Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 03/14] mei: me_client lookup function to return me_client object Tomas Winkler
2014-08-21 12:32 ` Josh Boyer
2014-08-21 13:14 ` Winkler, Tomas
2014-08-21 11:29 ` [char-misc-next 04/14] mei: use list for me clients book keeping Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 05/14] mei: add me client remove functions Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 06/14] mei: add mei_me_cl_by_uuid_id function Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 07/14] mei: add hbm commands return status values Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 08/14] mei: use disconnect name consistently Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 09/14] mei: revamp connect and disconnect response handling Tomas Winkler
2014-08-21 11:29 ` Tomas Winkler [this message]
2014-08-21 11:29 ` [char-misc-next 11/14] mei: simplify handling of hbm client events Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 12/14] mei: extract supported features from the hbm version Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 13/14] mei: enable adding more IOCTL handlers Tomas Winkler
2014-08-21 11:29 ` [char-misc-next 14/14] mei: use connect_data on the stack Tomas Winkler
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