[v3,4/4] Revert "scsi: core: run queue if SCSI device queue isn't ready and queue is idle"
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Message ID 20200407145906.v3.4.I630e6ca4cdcf9ab13ea899274745f9e3174eb12b@changeid
State New
Headers show
  • blk-mq: Fix two causes of IO stalls found in reboot testing
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Commit Message

Doug Anderson April 7, 2020, 10 p.m. UTC
This reverts commit 7e70aa789d4a0c89dbfbd2c8a974a4df717475ec.

Now that we have the patches ("blk-mq: In blk_mq_dispatch_rq_list()
"no budget" is a reason to kick") and ("blk-mq: Rerun dispatching in
the case of budget contention") we should no longer need the fix in
the SCSI code.  Revert it, resolving conflicts with other patches that
have touched this code.

With this revert (and the two new patches) I can run the script that
was in commit 7e70aa789d4a ("scsi: core: run queue if SCSI device
queue isn't ready and queue is idle") in a loop with no failure.  If I
do this revert without the two new patches I can easily get a failure.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
I don't know for sure that we can revert this patch, but in the very
least the original test case now passes.  If there is any question
about this, we can just drop this patch.

Changes in v3:
- ("Revert "scsi: core: run queue...") new for v3.

Changes in v2: None

 drivers/scsi/scsi_lib.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

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diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 47835c4b4ee0..ea18f618dc66 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1610,12 +1610,7 @@  static bool scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx)
 	struct request_queue *q = hctx->queue;
 	struct scsi_device *sdev = q->queuedata;
-	if (scsi_dev_queue_ready(q, sdev))
-		return true;
-	if (atomic_read(&sdev->device_busy) == 0 && !scsi_device_blocked(sdev))
-		blk_mq_delay_run_hw_queue(hctx, SCSI_QUEUE_DELAY);
-	return false;
+	return scsi_dev_queue_ready(q, sdev);
 static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx,