netdev - Re: [Bug #14925] sky2 panic under load

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Date:	Sun, 10 Jan 2010 17:36:46 -0700
From:	"Berck E. Nash" <flyboy@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	netdev@...r.kernel.org, Jarek Poplawski <jarkao2@...il.com>
Subject: Re: [Bug #14925] sky2 panic under load

Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of recent regressions.
> 
> The following bug entry is on the current list of known regressions
> from 2.6.32.  Please verify if it still should be listed and let me know
> (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=14925
> Subject		: sky2 panic under load
> Submitter	: Berck E. Nash <flyboy@...il.com>
> Date		: 2009-12-21 23:52 (21 days old)
> References	: http://marc.info/?l=linux-kernel&m=126143955730347&w=4
> 		  http://marc.info/?l=linux-kernel&m=126160893126548&w=4
> Handled-By	: Stephen Hemminger <shemminger@...tta.com>

The patch attached to the bug report did not fix the problem, but I'm
fairly certain that this one from Jarek P. did:

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@...g3k.org>

Reported-by: Berck E. Nash <flyboy@...il.com>
Tested-by: Berck E. Nash <flyboy@...il.com>
Signed-off-by: Jarek Poplawski <jarkao2@...il.com>

---

 drivers/net/sky2.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 1c01b96..7650f73 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1844,7 +1844,8 @@ 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)
+	/* Wake unless it's detached, and called e.g. from sky2_down() */
+	if (tx_avail(sky2) > MAX_SKB_TX_LE + 4 && netif_device_present(dev))
 		netif_wake_queue(dev);
 }

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