From: Alexander Aring <aahringo@xxxxxxxxxx>
commit 7a931477bff1c7548aa8492bccf600f5f29452b1 upstream.
This patch clears the DLM_IFL_CB_PENDING_BIT flag which will be set when
there is callback work queued when there was no callback to dequeue. It
is a buggy case and should never happen, that's why there is a
WARN_ON(). However if the case happens we are prepared to somehow
recover from it.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 61bed0baa4db ("fs: dlm: use a non-static queue for callbacks")
Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
Signed-off-by: David Teigland <teigland@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/dlm/ast.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
index 700ff2e0515a..ff0ef4653535 100644
--- a/fs/dlm/ast.c
+++ b/fs/dlm/ast.c
@@ -181,10 +181,12 @@ void dlm_callback_work(struct work_struct *work)
spin_lock(&lkb->lkb_cb_lock);
rv = dlm_dequeue_lkb_callback(lkb, &cb);
- spin_unlock(&lkb->lkb_cb_lock);
-
- if (WARN_ON_ONCE(rv == DLM_DEQUEUE_CALLBACK_EMPTY))
+ if (WARN_ON_ONCE(rv == DLM_DEQUEUE_CALLBACK_EMPTY)) {
+ clear_bit(DLM_IFL_CB_PENDING_BIT, &lkb->lkb_iflags);
+ spin_unlock(&lkb->lkb_cb_lock);
goto out;
+ }
+ spin_unlock(&lkb->lkb_cb_lock);
for (;;) {
castfn = lkb->lkb_astfn;
--
2.41.0
