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Btrfs: convert nested spin_lock_irqsave to spin_lock

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If spin_lock_irqsave is called twice in a row with the same second
argument, the interrupt state at the point of the second call overwrites
the value saved by the first call.  Indeed, the second call does not need
to save the interrupt state, so it is changed to a simple spin_lock.

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Julia Lawall 2009-07-22 16:49:00 -04:00 committed by Chris Mason
parent 4a8c9a62d7
commit 29c5e8ce01
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/async-thread.c
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@ -424,11 +424,11 @@ int btrfs_requeue_work(struct btrfs_work *work)
* list
*/
if (worker->idle) {
spin_lock_irqsave(&worker->workers->lock, flags);
spin_lock(&worker->workers->lock);
worker->idle = 0;
list_move_tail(&worker->worker_list,
&worker->workers->worker_list);
spin_unlock_irqrestore(&worker->workers->lock, flags);
spin_unlock(&worker->workers->lock);
}
if (!worker->working) {
wake = 1;