We may use foreach_grant_safe in the future with empty lists, so make
sure we can handle them.
Signed-off-by: Roger Pau Monné <roger....@citrix.com>
Cc: xen-de...@lists.xen.org
Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
---
drivers/block/xen-blkback/blkback.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/block/xen-blkback/blkback.c
b/drivers/block/xen-blkback/blkback.c
index d909acf0..7319f67 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -164,7 +164,7 @@ static void make_response(struct xen_blkif *blkif, u64 id,
#define foreach_grant_safe(pos, n, rbtree, node) \
for ((pos) = container_of(rb_first((rbtree)), typeof(*(pos)), node), \
- (n) = rb_next(&(pos)->node); \
+ (n) = (&(pos)->node != NULL) ? rb_next(&(pos)->node) : NULL; \
&(pos)->node != NULL; \
(pos) = container_of(n, typeof(*(pos)), node), \
(n) = (&(pos)->node != NULL) ? rb_next(&(pos)->node) : NULL)
--
1.7.7.5 (Apple Git-26)
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