diff mbox

[Bug,#14925] sky2 panic under load

Message ID 4B4B2FBD.5090007@ring3k.org
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Mike McCormack Jan. 11, 2010, 2:03 p.m. UTC 
Berck E. Nash wrote:
> 
> During TX timeout procedure dev could be awoken too early, e.g. by
> sky2_complete_tx() called from sky2_down(). Then sky2_xmit_frame()
> can run while buffers are freed causing an oops. This patch fixes it
> by adding netif_device_present() test in sky2_tx_complete().
> 
> Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=14925
> 
> With debugging by: Mike McCormack <mikem@ring3k.org>
> 
> Reported-by: Berck E. Nash <flyboy@gmail.com>
> Tested-by: Berck E. Nash <flyboy@gmail.com>
> Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
> 
> ---
> 
>  drivers/net/sky2.c |    3 ++-

Perhaps only sky2_tx_done should wake the queue?
Does the patch below fix the problem too?

thanks,

Mike



Subject: [PATCH] sky2: Don't wake queue in sky2_tx_complete()

We should only wake the tx queue on completion of
transmits, not after cleaning the tx ring.

Signed-off-by: Mike McCormack <mikem@ring3k.org>
---
 drivers/net/sky2.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

-- 1.5.6.5 

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 93d9635..6d9111d 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1843,9 +1843,6 @@  static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
 
 	sky2->tx_cons = idx;
 	smp_mb();
-
-	if (tx_avail(sky2) > MAX_SKB_TX_LE + 4)
-		netif_wake_queue(dev);
 }
 
 static void sky2_tx_reset(struct sky2_hw *hw, unsigned port)
@@ -2416,8 +2413,11 @@  static inline void sky2_tx_done(struct net_device *dev, u16 last)
 {
 	struct sky2_port *sky2 = netdev_priv(dev);
 
-	if (netif_running(dev))
+	if (netif_running(dev)) {
 		sky2_tx_complete(sky2, last);
+		if (tx_avail(sky2) > MAX_SKB_TX_LE + 4)
+			netif_wake_queue(dev);
+	}
 }
 
 static inline void sky2_skb_rx(const struct sky2_port *sky2,