From: Andy Grover <andy.grover@oracle.com>
Date: Thu, 4 Feb 2010 03:41:52 +0000 (-0800)
Subject: RDS: Add a warning if trying to allocate 0 sgs
X-Git-Tag: v2.6.37-rc1~147^2~499^2~73
X-Git-Url: http://bbs.cooldavid.org/git/?a=commitdiff_plain;h=ee4c7b47e46a9dea789aadb8279c8505f755b3ee;p=net-next-2.6.git

RDS: Add a warning if trying to allocate 0 sgs

rds_message_alloc_sgs() only works when nents is nonzero.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
---

diff --git a/net/rds/message.c b/net/rds/message.c
index f4c3be0878e..1f73a7358a8 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -240,6 +240,7 @@ struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents)
 	struct scatterlist *sg_ret;
 
 	WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs);
+	WARN_ON(!nents);
 
 	sg_ret = &sg_first[rm->m_used_sgs];
 	sg_init_table(sg_ret, nents);