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Commit d7a1bb0a authored by James Smart's avatar James Smart Committed by James Bottomley
Browse files

[SCSI] Block I/O while SG reset operation in progress - the midlayer patch 



The scsi midlayer portion of the patch

Signed-off-by: default avatarJames Smart <James.Smart@emulex.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 12e9b5fb

drivers/scsi/scsi_error.c

+22 −0
Original line number Diff line number Diff line
@@ -1672,7 +1672,9 @@ int 
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 @@ scsi_reset_provider(struct scsi_device *dev, int flag) 
	 */

	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 @@ scsi_reset_provider(struct scsi_device *dev, int flag) 
		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;

}

include/scsi/scsi_host.h

+5 −1
Original line number Diff line number Diff line
@@ -542,6 +542,9 @@ struct Scsi_Host { 
	 */

	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 @@ static inline int scsi_host_in_recovery(struct Scsi_Host *shost) 
{

	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 *);