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 f4c3be0878e97226d1b2d28d8504f8374274d169..1f73a7358a8e9eeaa238dcd687627ed14e9c6be6 100644 (file)
--- 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);