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authorMing Lei <ming.lei@redhat.com>2021-11-09 15:11:43 +0800
committerJens Axboe <axboe@kernel.dk>2021-11-09 08:14:27 -0700
commit93542fbfa7b726d053c01a9399577c03968c4f6b (patch)
tree8c51175536212413500e304da07ad81fb1ec19b8 /include/scsi
parentd2b9f12b0f7cf95c43f5fd4a18688d958d39e423 (diff)
scsi: make sure that request queue queiesce and unquiesce balanced
For fixing queue quiesce race between driver and block layer(elevator switch, update nr_requests, ...), we need to support concurrent quiesce and unquiesce, which requires the two call balanced. It isn't easy to audit that in all scsi drivers, especially the two may be called from different contexts, so do it in scsi core with one per-device atomic variable to balance quiesce and unquiesce. Reported-by: Yi Zhang <yi.zhang@redhat.com> Fixes: e70feb8b3e68 ("blk-mq: support concurrent queue quiesce/unquiesce") Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20211109071144.181581-4-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/scsi_device.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 430b73bd02ac..d1c6fc83b1e3 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -207,6 +207,7 @@ struct scsi_device {
* creation time */
unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
+ unsigned int queue_stopped; /* request queue is quiesced */
bool offline_already; /* Device offline message logged */
atomic_t disk_events_disable_depth; /* disable depth for disk events */