blk-mq: skip CPU offline notify on unmapped hctx

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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: bf0beec060 ("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>

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Cong Zhang 2025-12-30 17:17:05 +08:00 • committed by Jens Axboe

parent a2ce133969

commit 10845a105b

1 changed files with 1 additions and 1 deletions

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block/blk-mq.c

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