[SCSI] Block I/O while SG reset operation in progress - the midlayer patch
The scsi midlayer portion of the patch
Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 6a7a60f..6683d59 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1672,7 +1672,9 @@
scsi_reset_provider(struct scsi_device *dev, int flag)
{
struct scsi_cmnd *scmd = scsi_get_command(dev, GFP_KERNEL);
+ struct Scsi_Host *shost = dev->host;
struct request req;
+ unsigned long flags;
int rtn;
scmd->request = &req;
@@ -1699,6 +1701,10 @@
*/
scmd->pid = 0;
+ spin_lock_irqsave(shost->host_lock, flags);
+ shost->tmf_in_progress = 1;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+
switch (flag) {
case SCSI_TRY_RESET_DEVICE:
rtn = scsi_try_bus_device_reset(scmd);
@@ -1717,6 +1723,22 @@
rtn = FAILED;
}
+ spin_lock_irqsave(shost->host_lock, flags);
+ shost->tmf_in_progress = 0;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+
+ /*
+ * be sure to wake up anyone who was sleeping or had their queue
+ * suspended while we performed the TMF.
+ */
+ SCSI_LOG_ERROR_RECOVERY(3,
+ printk("%s: waking up host to restart after TMF\n",
+ __FUNCTION__));
+
+ wake_up(&shost->host_wait);
+
+ scsi_run_host_queues(shost);
+
scsi_next_command(scmd);
return rtn;
}
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index a42efd6..b3dd90f 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -542,6 +542,9 @@
*/
unsigned ordered_tag:1;
+ /* task mgmt function in progress */
+ unsigned tmf_in_progress:1;
+
/*
* Optional work queue to be utilized by the transport
*/
@@ -619,7 +622,8 @@
{
return shost->shost_state == SHOST_RECOVERY ||
shost->shost_state == SHOST_CANCEL_RECOVERY ||
- shost->shost_state == SHOST_DEL_RECOVERY;
+ shost->shost_state == SHOST_DEL_RECOVERY ||
+ shost->tmf_in_progress;
}
extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *);