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 <[email protected]>
Cc: Jens Osterkamp <[email protected]>
Cc: Kou Ishizaki <[email protected]>
----
drivers/net/spider_net.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
Index: linux-2.6.20-git16/drivers/net/spider_net.c
===================================================================
--- linux-2.6.20-git16.orig/drivers/net/spider_net.c 2007-02-20 15:02:46.000000000 -0600
+++ linux-2.6.20-git16/drivers/net/spider_net.c 2007-02-20 15:02:48.000000000 -0600
@@ -803,8 +803,12 @@ 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;
-
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