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| author | Chris Mason <chris.mason@oracle.com> | 2011-12-23 07:53:00 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-12-23 07:53:00 -0500 |
| commit | 8d532b2afb2eacc84588db709ec280a3d1219be3 (patch) | |
| tree | 27a4353e75d67bc41e9d2172702dbed1109095eb | |
| parent | d85c8a6f1bc083279215ff6e79b7c292bf3ec905 (diff) | |
| download | linux-8d532b2afb2eacc84588db709ec280a3d1219be3.tar.bz2 | |
Btrfs: fix worker lock misuse in find_worker
Dan Carpenter noticed that we were doing a double unlock on the worker
lock, and sometimes picking a worker thread without the lock held.
This fixes both errors.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
| -rw-r--r-- | fs/btrfs/async-thread.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c index cb97174e2366..0b394580d860 100644 --- a/fs/btrfs/async-thread.c +++ b/fs/btrfs/async-thread.c @@ -563,8 +563,8 @@ static struct btrfs_worker_thread *find_worker(struct btrfs_workers *workers) struct list_head *fallback; int ret; -again: spin_lock_irqsave(&workers->lock, flags); +again: worker = next_worker(workers); if (!worker) { @@ -579,6 +579,7 @@ again: spin_unlock_irqrestore(&workers->lock, flags); /* we're below the limit, start another worker */ ret = __btrfs_start_workers(workers); + spin_lock_irqsave(&workers->lock, flags); if (ret) goto fallback; goto again; |