Re: [PATCH] blk-mq: don't leak preempt counter/q_usage_counter when allocating rq failed

On Fri, Jul 14, 2017 at 04:41:36PM +0800, Ming Lei wrote:

From: Ming Lei <redacted>

When blk_mq_get_request() failed, preempt counter isn't
released, and blk_mq_make_request() doesn't release the counter
too.

This patch fixes the issue, and makes sure that preempt counter
is only held if rq is allocated successfully. The same policy is
applied on .q_usage_counter too.

Hi Jens,

Given NOWAIT has been merged, could you consider this patch for
v4.13?

Thanks,
Ming