Subject: [PATCH 10/12]: spidernet: transmit race

From: Linas Vepstas <lins@austin.ibm.com>
Multiple threads performing a transmit can race into
the spidernet tx ring cleanup code. This puts the 
relevant check under a lock.

Signed-off-by: Linas Vepstas <lins@austin.ibm.com>
Cc: Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
Cc: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

----

Sent on 9 Feb 2007

 drivers/net/spider_net.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/net/spider_net.c
===================================================================
--- linux-2.6.orig/drivers/net/spider_net.c
+++ linux-2.6/drivers/net/spider_net.c
@@ -802,8 +802,12 @@ spider_net_release_tx_chain(struct spide
 	unsigned long flags;
 	int status;
 
-	while (chain->tail != chain->head) {
+	while (1) {
 		spin_lock_irqsave(&chain->lock, flags);
+		if (chain->tail == chain->head) {
+			spin_unlock_irqrestore(&chain->lock, flags);
+			return 0;
+		}
 		descr = chain->tail;
 		hwdescr = descr->hwdescr;