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| author | Jan Kara <jack@suse.cz> | 2014-04-03 14:46:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-03 16:20:49 -0700 |
| commit | 5acda9d12dcf1ad0d9a5a2a7c646de3472fa7555 (patch) | |
| tree | 5103d2779fbf2f1f07edb1ed51083d1303073ef9 /include/linux/backing-dev.h | |
| parent | 6ca738d60c563d5c6cf6253ee4b8e76fa77b2b9e (diff) | |
| download | linux-5acda9d12dcf1ad0d9a5a2a7c646de3472fa7555.tar.gz linux-5acda9d12dcf1ad0d9a5a2a7c646de3472fa7555.tar.bz2 linux-5acda9d12dcf1ad0d9a5a2a7c646de3472fa7555.zip | |
bdi: avoid oops on device removal
After commit 839a8e8660b6 ("writeback: replace custom worker pool
implementation with unbound workqueue") when device is removed while we
are writing to it we crash in bdi_writeback_workfn() ->
set_worker_desc() because bdi->dev is NULL.
This can happen because even though bdi_unregister() cancels all pending
flushing work, nothing really prevents new ones from being queued from
balance_dirty_pages() or other places.
Fix the problem by clearing BDI_registered bit in bdi_unregister() and
checking it before scheduling of any flushing work.
Fixes: 839a8e8660b6777e7fe4e80af1a048aebe2b5977
Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Derek Basehore <dbasehore@chromium.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/backing-dev.h')
| -rw-r--r-- | include/linux/backing-dev.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 24819001f5c8..e488e9459a93 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -95,7 +95,7 @@ struct backing_dev_info { unsigned int max_ratio, max_prop_frac; struct bdi_writeback wb; /* default writeback info for this bdi */ - spinlock_t wb_lock; /* protects work_list */ + spinlock_t wb_lock; /* protects work_list & wb.dwork scheduling */ struct list_head work_list; |