diff options
| author | Cong Zhang | 2025-12-30 17:17:05 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2026-01-08 10:14:37 +0100 |
| commit | 9eb1ee1f2acbf6359d9b63eb739dc4b7cf08c31e (patch) | |
| tree | 113052449b698dabeebc66614a5061e0a4ca85f9 /block | |
| parent | 29abf51fdf77fb8fe079401aea27cdd20479f661 (diff) | |
blk-mq: skip CPU offline notify on unmapped hctx
[ Upstream commit 10845a105bbcb030647a729f1716c2309da71d33 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index db72779760d5..1891863dcba1 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3658,7 +3658,7 @@ static int blk_mq_hctx_notify_offline(unsigned int cpu, struct hlist_node *node) struct blk_mq_hw_ctx, cpuhp_online); int ret = 0; - if (blk_mq_hctx_has_online_cpu(hctx, cpu)) + if (!hctx->nr_ctx || blk_mq_hctx_has_online_cpu(hctx, cpu)) return 0; /* |