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author | Jens Axboe <axboe@fb.com> | 2014-10-07 08:39:20 -0600 |
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committer | Jens Axboe <axboe@fb.com> | 2014-10-07 08:39:20 -0600 |
commit | abab13b5c4fd1fec4f9a61622548012d93dc2831 (patch) | |
tree | e73fa24015b0a494fbe9dab8a1e9b3460c935b87 /lib/list_debug.c | |
parent | d8f429e1669b9709f5b669aac9d734dbe0640891 (diff) |
blk-mq: fix potential hang if rolling wakeup depth is too high
We currently divide the queue depth by 4 as our batch wakeup
count, but we split the wakeups over BT_WAIT_QUEUES number of
wait queues. This defaults to 8. If the product of the resulting
batch wake count and BT_WAIT_QUEUES is higher than the device
queue depth, we can get into a situation where a task goes to
sleep waiting for a request, but never gets woken up.
Reported-by: Bart Van Assche <bvanassche@acm.org>
Fixes: 4bb659b156996
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'lib/list_debug.c')
0 files changed, 0 insertions, 0 deletions