[dm-devel] [RFC PATCH] blk-mq: fixup RESTART when queue becomes idle
Bart Van Assche
Bart.VanAssche at wdc.com
Thu Jan 18 20:58:50 UTC 2018
On Thu, 2018-01-18 at 15:48 -0500, Mike Snitzer wrote:
> For Bart's test the underlying scsi-mq driver is what is regularly
> hitting this case in __blk_mq_try_issue_directly():
>
> if (blk_mq_hctx_stopped(hctx) || blk_queue_quiesced(q))
Hello Mike,
That code path is not the code path that triggered the lockups that I reported
during the past days. These lockups were all triggered by incorrect handling of
.queue_rq() returning BLK_STS_RESOURCE.
Bart.
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