GFS2: Fix panic in glock memory shrinker

[pandora-kernel.git] / fs / gfs2 / glock.c

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index fdb796c..827136e 100644 (file)
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1314,6 +1314,10 @@ static int gfs2_shrink_glock_memory(int nr, gfp_t gfp_mask)
                list_del_init(&gl->gl_lru);
                atomic_dec(&lru_count);
 
+               /* Check if glock is about to be freed */
+               if (atomic_read(&gl->gl_ref) == 0)
+                       continue;
+
                /* Test for being demotable */
                if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
                        gfs2_glock_hold(gl);