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| author |   Jan Kara <jack@suse.cz> | 2017-04-11 11:29:01 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2017-04-11 08:09:14 -0600 |
| commit | 3f19cd23f3a9420fe7bd98ad41d05e45fa6d4d47 (patch) | |
| tree | 1070c884072bcc98912373ca6953c2010451b1a5 /lib | |
| parent | blk-mq: Show symbolic names for hctx state and flags (diff) | |
| download | linux-dev-3f19cd23f3a9420fe7bd98ad41d05e45fa6d4d47.tar.xz linux-dev-3f19cd23f3a9420fe7bd98ad41d05e45fa6d4d47.zip | |
block: Fix list corruption of blk stats callback list
When CFQ calls wbt_disable_default(), it will call
blk_stat_remove_callback() to stop gathering IO statistics for the
purposes of writeback throttling. Later, when request_queue is
unregistered, wbt_exit() will call blk_stat_remove_callback() again
which will try to delete callback from the list again and possibly cause
list corruption.
Fix the problem by making wbt_disable_default() called wbt_exit() which
is properly guarded against being called multiple times.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions