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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 /mm/msync.c
parentd2b9f12b0f7cf95c43f5fd4a18688d958d39e423 (diff)
downloadlinux-93542fbfa7b726d053c01a9399577c03968c4f6b.tar.bz2
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>
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