On 8/14/2017 11:40 PM, Keith Busch wrote:

blk_mq_get_request() does not release the callers queue usage counter
when allocation fails. The caller still needs to account for its own
queue usage when it is unable to allocate a request.

Fixes: 1ad43c0078b7 ("blk-mq: don't leak preempt counter/q_usage_counter when allocating rq failed")

Reported-by: Max Gurtovoy <redacted>
Signed-off-by: Keith Busch <redacted>
---

tested with 4.13-rc5+ using the following commands in a loop:

1. modprobe nvme
2. sleep 10
3. modprobe -r nvme

Looks good,

Tested-by: Max Gurtovoy <redacted>