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btrfs: always choose work from prio_head first 

In case we do not refill, we can overwrite cur pointer from prio_head
by one from not prioritized head, what looks as something that was
not intended.

This change make we always take works from prio_head first until it's
not empty.

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Stanislaw Gruszka 2014-02-08 23:18:43 +01:00 committed by Josef Bacik
parent dcfd5ad2fc
commit 51b98effa4
1 changed files with 5 additions and 4 deletions
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9
fs/btrfs/async-thread.c
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@ -262,18 +262,19 @@ static struct btrfs_work *get_next_work(struct btrfs_worker_thread *worker,
struct btrfs_work *work = NULL;
struct list_head *cur = NULL;
if (!list_empty(prio_head))
if (!list_empty(prio_head)) {
cur = prio_head->next;
goto out;
}
smp_mb();
if (!list_empty(&worker->prio_pending))
goto refill;
if (!list_empty(head))
if (!list_empty(head)) {
cur = head->next;
if (cur)
goto out;
}
refill:
spin_lock_irq(&worker->lock);