# HG changeset patch
# User t.horikoshi@jp.fujisu.com
# Date 1169712349 -32400
# Node ID fef672b56e77ed6ce66fc6b97b89bc4e8c677b6a
# Parent  b4df7de0cbf7530c3248956243bc9c520db2d609
netfront add check grant reference

Signed-off-by: Tomonari Horikoshi <t.horikoshi@jp.fujitsu.com>

diff -r b4df7de0cbf7 -r fef672b56e77 linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c	Wed Jan 24 12:28:05 2007 -0700
+++ b/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c	Thu Jan 25 17:05:49 2007 +0900
@@ -613,6 +613,9 @@ static int network_open(struct net_devic
 
 static inline int netfront_tx_slot_available(struct netfront_info *np)
 {
+	if( gnttab_empty_grant_references(&np->gref_tx_head) )
+		return 0;
+
 	return RING_FREE_REQUESTS(&np->tx) >= MAX_SKB_FRAGS + 2;
 }