Ensure that if scsi-mq is enabled that scsi_wait_for_queuecommand()
waits until ongoing shost->hostt->queuecommand() calls have finished.
Signed-off-by: Bart Van Assche <bart.vanass...@sandisk.com>
Reviewed-by: Christoph Hellwig <h...@lst.de>
Cc: James Bottomley <j...@linux.vnet.ibm.com>
Cc: Martin K. Petersen <martin.peter...@oracle.com>
Cc: Doug Ledford <dledf...@redhat.com>
---
drivers/scsi/scsi_lib.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index c1561e7..9b8b19e 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2724,8 +2724,6 @@ EXPORT_SYMBOL_GPL(sdev_evt_send_simple);
/**
* scsi_request_fn_active() - number of kernel threads inside scsi_request_fn()
* @shost: SCSI host for which to count the number of scsi_request_fn()
callers.
- *
- * To do: add support for scsi-mq in this function.
*/
static int scsi_request_fn_active(struct Scsi_Host *shost)
{
@@ -2744,12 +2742,20 @@ static int scsi_request_fn_active(struct Scsi_Host
*shost)
return request_fn_active;
}
+static void scsi_mq_wait_for_queuecommand(struct Scsi_Host *shost)
+{
+ struct scsi_device *sdev;
+
+ shost_for_each_device(sdev, shost)
+ blk_mq_quiesce_queue(sdev->request_queue);
+}
+
/**
* scsi_wait_for_queuecommand() - wait for ongoing queuecommand() calls
* @shost: SCSI host pointer.
*
* Wait until the ongoing shost->hostt->queuecommand() calls that are
- * invoked from scsi_request_fn() have finished.
+ * invoked from either scsi_request_fn() or scsi_queue_rq() have finished.
*
* To do: avoid that scsi_send_eh_cmnd() calls queuecommand() after
* scsi_internal_device_block() has blocked a SCSI device and remove and also
@@ -2757,8 +2763,12 @@ static int scsi_request_fn_active(struct Scsi_Host
*shost)
*/
void scsi_wait_for_queuecommand(struct Scsi_Host *shost)
{
- while (scsi_request_fn_active(shost))
- msleep(20);
+ if (shost->use_blk_mq) {
+ scsi_mq_wait_for_queuecommand(shost);
+ } else {
+ while (scsi_request_fn_active(shost))
+ msleep(20);
+ }
}
EXPORT_SYMBOL(scsi_wait_for_queuecommand);
--
2.10.1
--
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