[Xen-changelog] [xen-unstable] netfront: Check availability of grant references in start_xmit().

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1169727883 0
# Node ID 42aaf08dd20ec6cabf9b4c3aa536b918be352352
# Parent  ee1febe317f72957c2cf2142dc7cf0cc6c46647d
netfront: Check availability of grant references in start_xmit().
Signed-off-by: Tomonari Horikoshi <t.horikoshi@xxxxxxxxxxxxxx>
---
 linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c |    4 ++++
 1 files changed, 4 insertions(+)

diff -r ee1febe317f7 -r 42aaf08dd20e 
linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c      Thu Jan 25 
11:58:00 2007 +0000
+++ b/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c      Thu Jan 25 
12:24:43 2007 +0000
@@ -613,6 +613,10 @@ static int network_open(struct net_devic
 
 static inline int netfront_tx_slot_available(struct netfront_info *np)
 {
+       /* XXX Need to check we have enough grants for worst-case fragments. */
+       if (gnttab_empty_grant_references(&np->gref_tx_head))
+               return 0;
+
        return RING_FREE_REQUESTS(&np->tx) >= MAX_SKB_FRAGS + 2;
 }
 

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