linux-kernel - [PATCH 1/1] net: fec: fix oops after transmit queue timeout

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Message-Id: <1426093216-18370-1-git-send-email-george.joseph@fairview5.com>
Date:	Wed, 11 Mar 2015 11:00:15 -0600
From:	George Joseph <george.joseph@...rview5.com>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Nimrod Andy <B38611@...escale.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Frank Li <Frank.Li@...escale.com>,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: [PATCH 1/1] net: fec: fix oops after transmit queue timeout

When a transmit queue timeout happens, dev_watchdog calls fec_timeout
which in turns schedules fec_enet_timeout_work.  fec_enet_timeout_work
uses container_of to get the private data structure (fep) then tries to
use fep->netdev.  Unfortunately, nobody ever set fep->netdev so the result
is a NULL pointer oops.

With fep->netdev set right after fep is allocated in fep_probe, the
drivers recovers nicely after the tx queue timeout.

Signed-off-by: George Joseph <george.joseph@...rview5.com>
Tested-by: George Joseph <george.joseph@...rview5.com>
---
 drivers/net/ethernet/freescale/fec_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 3dca494..f6392ad 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3161,6 +3161,7 @@ fec_probe(struct platform_device *pdev)
 	/* setup board info structure */
 	fep = netdev_priv(ndev);
 
+	fep->netdev = ndev;
 	fep->num_rx_queues = num_rx_qs;
 	fep->num_tx_queues = num_tx_qs;
 
-- 
2.1.0

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