tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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blk-mq: skip CPU offline notify on unmapped hctx

If an hctx has no software ctx mapped, blk_mq_map_swqueue() never
allocates tags and leaves hctx->tags NULL. The CPU hotplug offline
notifier can still run for that hctx, return early since hctx cannot
hold any requests.

Signed-off-by: Cong Zhang <cong.zhang@oss.qualcomm.com>
Fixes: bf0beec0607d ("blk-mq: drain I/O when all CPUs in a hctx are offline")
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

authored by

Cong Zhang and committed by
Jens Axboe 10845a10 a2ce1339

+1 -1
+1 -1
block/blk-mq.c
··· 3721 3721 struct blk_mq_hw_ctx, cpuhp_online); 3722 3722 int ret = 0; 3723 3723 3724 - if (blk_mq_hctx_has_online_cpu(hctx, cpu)) 3724 + if (!hctx->nr_ctx || blk_mq_hctx_has_online_cpu(hctx, cpu)) 3725 3725 return 0; 3726 3726 3727 3727 /*