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author | Paolo Valente <paolo.valente@linaro.org> | 2019-08-07 16:17:53 +0200 |
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committer | Jens Axboe <axboe@kernel.dk> | 2019-08-08 07:30:50 -0600 |
commit | 08d383a74948b43eb6e96c86153e63cbf276f1fa (patch) | |
tree | 7b893061ad7cee76de8e1b868b0c23ed45200ffc /block/genhd.c | |
parent | 430380b4637aec646996b4aef67ad417593923b2 (diff) | |
download | linux-08d383a74948b43eb6e96c86153e63cbf276f1fa.tar.bz2 |
block, bfq: reset last_completed_rq_bfqq if the pointed queue is freed
Since commit 13a857a4c4e8 ("block, bfq: detect wakers and
unconditionally inject their I/O"), BFQ stores, in a per-device
pointer last_completed_rq_bfqq, the last bfq_queue that had an I/O
request completed. If some bfq_queue receives new I/O right after the
last request of last_completed_rq_bfqq has been completed, then
last_completed_rq_bfqq may be a waker bfq_queue.
But if the bfq_queue last_completed_rq_bfqq points to is freed, then
last_completed_rq_bfqq becomes a dangling reference. This commit
resets last_completed_rq_bfqq if the pointed bfq_queue is freed.
Fixes: 13a857a4c4e8 ("block, bfq: detect wakers and unconditionally inject their I/O")
Reported-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/genhd.c')
0 files changed, 0 insertions, 0 deletions