staging: lustre: osc: use rb_entry_safe

Use rb_entry_safe() instead of container_of() to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c b/drivers/staging/lustre/lustre/osc/osc_cache.c
index a7f57f5763fc2d0ba4d429e38ff6ca28af8b6782..5ac0e1439c2bd6e2ba78859b909290d0836879c2 100644 (file)
--- a/drivers/staging/lustre/lustre/osc/osc_cache.c
+++ b/drivers/staging/lustre/lustre/osc/osc_cache.c
@@ -142,10 +142,7 @@ static const char *oes_strings[] = {
 
 static inline struct osc_extent *rb_extent(struct rb_node *n)
 {
-       if (!n)
-               return NULL;
-
-       return container_of(n, struct osc_extent, oe_node);
+       return rb_entry_safe(n, struct osc_extent, oe_node);
 }
 
 static inline struct osc_extent *next_extent(struct osc_extent *ext)