blk-mq: Fix tagset reinit in the presence of cpu hot-unplug
[ Upstream commit 0067d4b020
]
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>
steinar/wifi_calib_4_9_kernel
parent
143d13d1e6
commit
d28046fb8c
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@ -311,6 +311,9 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set)
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for (i = 0; i < set->nr_hw_queues; i++) {
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struct blk_mq_tags *tags = set->tags[i];
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if (!tags)
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continue;
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for (j = 0; j < tags->nr_tags; j++) {
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if (!tags->rqs[j])
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continue;
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