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blk-mq: Fix tagset reinit in the presence of cpu hot-unplug

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[ Upstream commit 0067d4b020ea07a58540acb2c5fcd3364bf326e0 ]

In case cpu was unplugged, we need to make sure not to assume
that the tags for that cpu are still allocated. so check
for null tags when reinitializing a tagset.

Reported-by: Yi Zhang <yizhan@redhat.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sagi Grimberg 2017-03-13 16:10:11 +02:00 committed by Greg Kroah-Hartman
parent 143d13d1e6
commit d28046fb8c
1 changed files with 3 additions and 0 deletions
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3
block/blk-mq-tag.c
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@ -311,6 +311,9 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set)
for (i = 0; i < set->nr_hw_queues; i++) {
struct blk_mq_tags *tags = set->tags[i];
if (!tags)
continue;
for (j = 0; j < tags->nr_tags; j++) {
if (!tags->rqs[j])
continue;