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Commit 217fd5e7 authored by Roger Pau Monne's avatar Roger Pau Monne Committed by Konrad Rzeszutek Wilk
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xen-blkback: fix foreach_grant_safe to handle empty lists 



We may use foreach_grant_safe in the future with empty lists, so make
sure we can handle them.

Signed-off-by: default avatarRoger Pau Monné <roger.pau@citrix.com>
Cc: xen-devel@lists.xen.org
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 29d0b218

drivers/block/xen-blkback/blkback.c

+1 −1
Original line number Diff line number Diff line
@@ -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)