[PATCH 3.2 29/61] [SCSI] qla2xxx: Add mutex around optrom calls to serialize accesses.

[Ben Hutchings <ben@decadent.org.uk>]

3.2.96-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Chad Dupuis <chad.dupuis@qlogic.com>

commit 7a8ab9c840b5dff9bb70328338a86444ed1c2415 upstream.

Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/scsi/qla2xxx/qla_attr.c | 61 ++++++++++++++++++++++++++++-------------
 drivers/scsi/qla2xxx/qla_bsg.c  | 12 ++++++--
 drivers/scsi/qla2xxx/qla_def.h  |  1 +
 drivers/scsi/qla2xxx/qla_os.c   |  1 +
 4 files changed, 54 insertions(+), 21 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -215,12 +215,17 @@ qla2x00_sysfs_read_optrom(struct file *f
 	struct scsi_qla_host *vha = shost_priv(dev_to_shost(container_of(kobj,
 	    struct device, kobj)));
 	struct qla_hw_data *ha = vha->hw;
+	ssize_t rval = 0;
 
 	if (ha->optrom_state != QLA_SREADING)
 		return 0;
 
-	return memory_read_from_buffer(buf, count, &off, ha->optrom_buffer,
-					ha->optrom_region_size);
+	mutex_lock(&ha->optrom_mutex);
+	rval = memory_read_from_buffer(buf, count, &off, ha->optrom_buffer,
+	    ha->optrom_region_size);
+	mutex_unlock(&ha->optrom_mutex);
+
+	return rval;
 }
 
 static ssize_t
@@ -239,7 +244,9 @@ qla2x00_sysfs_write_optrom(struct file *
 	if (off + count > ha->optrom_region_size)
 		count = ha->optrom_region_size - off;
 
+	mutex_lock(&ha->optrom_mutex);
 	memcpy(&ha->optrom_buffer[off], buf, count);
+	mutex_unlock(&ha->optrom_mutex);
 
 	return count;
 }
@@ -262,10 +269,10 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 	struct scsi_qla_host *vha = shost_priv(dev_to_shost(container_of(kobj,
 	    struct device, kobj)));
 	struct qla_hw_data *ha = vha->hw;
-
 	uint32_t start = 0;
 	uint32_t size = ha->optrom_size;
 	int val, valid;
+	ssize_t rval = count;
 
 	if (off)
 		return -EINVAL;
@@ -278,12 +285,14 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 	if (start > ha->optrom_size)
 		return -EINVAL;
 
+	mutex_lock(&ha->optrom_mutex);
 	switch (val) {
 	case 0:
 		if (ha->optrom_state != QLA_SREADING &&
-		    ha->optrom_state != QLA_SWRITING)
-			return -EINVAL;
-
+		    ha->optrom_state != QLA_SWRITING) {
+			rval =  -EINVAL;
+			goto out;
+		}
 		ha->optrom_state = QLA_SWAITING;
 
 		ql_dbg(ql_dbg_user, vha, 0x7061,
@@ -294,8 +303,10 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 		ha->optrom_buffer = NULL;
 		break;
 	case 1:
-		if (ha->optrom_state != QLA_SWAITING)
-			return -EINVAL;
+		if (ha->optrom_state != QLA_SWAITING) {
+			rval = -EINVAL;
+			goto out;
+		}
 
 		ha->optrom_region_start = start;
 		ha->optrom_region_size = start + size > ha->optrom_size ?
@@ -309,13 +320,15 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 			    "(%x).\n", ha->optrom_region_size);
 
 			ha->optrom_state = QLA_SWAITING;
-			return -ENOMEM;
+			rval = -ENOMEM;
+			goto out;
 		}
 
 		if (qla2x00_wait_for_hba_online(vha) != QLA_SUCCESS) {
 			ql_log(ql_log_warn, vha, 0x7063,
 			    "HBA not online, failing NVRAM update.\n");
-			return -EAGAIN;
+			rval = -EAGAIN;
+			goto out;
 		}
 
 		ql_dbg(ql_dbg_user, vha, 0x7064,
@@ -327,8 +340,10 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 		    ha->optrom_region_start, ha->optrom_region_size);
 		break;
 	case 2:
-		if (ha->optrom_state != QLA_SWAITING)
-			return -EINVAL;
+		if (ha->optrom_state != QLA_SWAITING) {
+			rval = -EINVAL;
+			goto out;
+		}
 
 		/*
 		 * We need to be more restrictive on which FLASH regions are
@@ -361,7 +376,8 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 		if (!valid) {
 			ql_log(ql_log_warn, vha, 0x7065,
 			    "Invalid start region 0x%x/0x%x.\n", start, size);
-			return -EINVAL;
+			rval = -EINVAL;
+			goto out;
 		}
 
 		ha->optrom_region_start = start;
@@ -376,7 +392,8 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 			    "(%x)\n", ha->optrom_region_size);
 
 			ha->optrom_state = QLA_SWAITING;
-			return -ENOMEM;
+			rval = -ENOMEM;
+			goto out;
 		}
 
 		ql_dbg(ql_dbg_user, vha, 0x7067,
@@ -386,13 +403,16 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 		memset(ha->optrom_buffer, 0, ha->optrom_region_size);
 		break;
 	case 3:
-		if (ha->optrom_state != QLA_SWRITING)
-			return -EINVAL;
+		if (ha->optrom_state != QLA_SWRITING) {
+			rval = -EINVAL;
+			goto out;
+		}
 
 		if (qla2x00_wait_for_hba_online(vha) != QLA_SUCCESS) {
 			ql_log(ql_log_warn, vha, 0x7068,
 			    "HBA not online, failing flash update.\n");
-			return -EAGAIN;
+			rval = -EAGAIN;
+			goto out;
 		}
 
 		ql_dbg(ql_dbg_user, vha, 0x7069,
@@ -403,9 +423,12 @@ qla2x00_sysfs_write_optrom_ctl(struct fi
 		    ha->optrom_region_start, ha->optrom_region_size);
 		break;
 	default:
-		return -EINVAL;
+		rval = -EINVAL;
 	}
-	return count;
+
+out:
+	mutex_unlock(&ha->optrom_mutex);
+	return rval;
 }
 
 static struct bin_attribute sysfs_optrom_ctl_attr = {
--- a/drivers/scsi/qla2xxx/qla_bsg.c
+++ b/drivers/scsi/qla2xxx/qla_bsg.c
@@ -1400,9 +1400,12 @@ qla2x00_read_optrom(struct fc_bsg_job *b
 	struct qla_hw_data *ha = vha->hw;
 	int rval = 0;
 
+	mutex_lock(&ha->optrom_mutex);
 	rval = qla2x00_optrom_setup(bsg_job, vha, 0);
-	if (rval)
+	if (rval) {
+		mutex_unlock(&ha->optrom_mutex);
 		return rval;
+	}
 
 	ha->isp_ops->read_optrom(vha, ha->optrom_buffer,
 	    ha->optrom_region_start, ha->optrom_region_size);
@@ -1416,6 +1419,7 @@ qla2x00_read_optrom(struct fc_bsg_job *b
 	vfree(ha->optrom_buffer);
 	ha->optrom_buffer = NULL;
 	ha->optrom_state = QLA_SWAITING;
+	mutex_unlock(&ha->optrom_mutex);
 	bsg_job->job_done(bsg_job);
 	return rval;
 }
@@ -1428,9 +1432,12 @@ qla2x00_update_optrom(struct fc_bsg_job
 	struct qla_hw_data *ha = vha->hw;
 	int rval = 0;
 
+	mutex_lock(&ha->optrom_mutex);
 	rval = qla2x00_optrom_setup(bsg_job, vha, 1);
-	if (rval)
+	if (rval) {
+		mutex_unlock(&ha->optrom_mutex);
 		return rval;
+	}
 
 	sg_copy_to_buffer(bsg_job->request_payload.sg_list,
 	    bsg_job->request_payload.sg_cnt, ha->optrom_buffer,
@@ -1443,6 +1450,7 @@ qla2x00_update_optrom(struct fc_bsg_job
 	vfree(ha->optrom_buffer);
 	ha->optrom_buffer = NULL;
 	ha->optrom_state = QLA_SWAITING;
+	mutex_unlock(&ha->optrom_mutex);
 	bsg_job->job_done(bsg_job);
 	return rval;
 }
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -2723,6 +2723,7 @@ struct qla_hw_data {
 #define QLA_SWRITING	2
 	uint32_t	optrom_region_start;
 	uint32_t	optrom_region_size;
+	struct mutex	optrom_mutex;
 
 /* PCI expansion ROM image information. */
 #define ROM_CODE_TYPE_BIOS	0
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -2023,6 +2023,7 @@ qla2x00_probe_one(struct pci_dev *pdev,
 	ha->mem_only = mem_only;
 	spin_lock_init(&ha->hardware_lock);
 	spin_lock_init(&ha->vport_slock);
+	mutex_init(&ha->optrom_mutex);
 
 	/* Set ISP-type information. */
 	qla2x00_set_isp_flags(ha);