| commit | 9470e4a693db84bee7becbba8de01af02bb23c9f | [log] [tgz] |
|---|---|---|
| author | Jens Axboe <axboe@fb.com> | Fri Jun 19 10:19:36 2015 -0600 |
| committer | Jens Axboe <axboe@fb.com> | Fri Jun 19 10:19:36 2015 -0600 |
| tree | 9267bd9cd8d882e8996ba5b2df80ac4277909519 | |
| parent | 4ceab71b9d84e55b59a76b54b2999dc377aae6e6 [diff] |
cfq-iosched: fix sysfs oops when attempting to read unconfigured weights
If none of the devices in the system are using CFQ, then attempting to
read:
/sys/fs/cgroup/blkio/blkio.leaf_weight
will results in a NULL dereference. Check for a valid cfq_group_data
struct before attempting to dereference it.
Reported-by: Andrey Wagin <avagin@gmail.com>
Fixes: e48453c3 ("block, cgroup: implement policy-specific per-blkcg data")
Signed-off-by: Jens Axboe <axboe@fb.com>