On 10/23/22 18:57, Chao Leng wrote:
blk_mq_quiesce_tagset() support concurrency. blk_mq_quiesce_tagset() just
check the flag(QUEUE_FLAG_SKIP_TAGSET_QUIESCE), it has no impact on
concurrency.
Hi Chao,
I think it depends on how the QUEUE_FLAG_SKIP_TAGSET_QUIESCE flag is
set. I agree if that flag is set once and never modified that there is
no race. What I'm wondering about is whether there could be a need for
block drivers to set the QUEUE_FLAG_SKIP_TAGSET_QUIESCE flag just before
blk_mq_quiesce_tagset() is called and cleared immediately after
blk_mq_quiesce_tagset() returns? In that case I think there is a race
condition.
Thanks,
Bart.
