Merge tag 'locks-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux

Pull file locking bugfix from Jeff Layton:
 "Just a single fix for a bug that crept into POSIX lock deadlock
  detection in v5.0"

* tag 'locks-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux:
  locks: wake any locks blocked on request before deadlock check

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/locks.c b/fs/locks.c
index eaa1cfaf73b0..71d0c6c2aac5 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1160,6 +1160,11 @@ static int posix_lock_inode(struct inode *inode, struct file_lock *request,
                          */
                         error = -EDEADLK;
                         spin_lock(&blocked_lock_lock);
+                        /*
+                         * Ensure that we don't find any locks blocked on this
+                         * request during deadlock detection.
+                         */
+                        __locks_wake_up_blocks(request);
                         if (likely(!posix_locks_deadlock(request, fl))) {
                                 error = FILE_LOCK_DEFERRED;
                                 __locks_insert_block(fl, request,