[PATCH 5/6] blk-mq: Fix queue freeze deadlock

[Keith Busch]

On Thu, Jan 05, 2017 at 07:33:22AM +0000, Bart Van Assche wrote:
> This patch adds a second code path to the blk-mq core for running queues and
> hence will make the blk-mq core harder to maintain. Have you considered to
> implement this functionality by introducing a new "fail all requests" flag
> for hctx queues such that blk_mq_abandon_stopped_requests() can reuse the
> existing mechanism for running a queue?

Thanks for the suggestion. I'll look into that. I wanted to avoid more
flags to test for in the fast-path, but I see that a special queue run
method is problematic for maintenance.