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Message-ID: <1363625376-35612-3-git-send-email-roger.pau@citrix.com> Date: Mon, 18 Mar 2013 17:49:33 +0100 From: Roger Pau Monne <roger.pau@...rix.com> To: <xen-devel@...ts.xen.org>, <linux-kernel@...r.kernel.org> CC: Roger Pau Monne <roger.pau@...rix.com>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Subject: [PATCH 2/5] 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: Roger Pau Monné <roger.pau@...rix.com> Cc: xen-devel@...ts.xen.org Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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