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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, stable@vger.kernel.org,
        Richard Weinberger <richard@nod.at>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 3.12 105/133] net,via-rhine: Fix tx_timeout handling
Date: Tue,  4 Feb 2014 13:08:26 -0800
Message-Id: <20140204210740.000201247@linuxfoundation.org>
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3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@nod.at>

[ Upstream commit a926592f5e4e900f3fa903298c4619a131e60963 ]

rhine_reset_task() misses to disable the tx scheduler upon reset,
this can lead to a crash if work is still scheduled while we're resetting
the tx queue.

Fixes:
[   93.591707] BUG: unable to handle kernel NULL pointer dereference at 0000004c
[   93.595514] IP: [<c119d10d>] rhine_napipoll+0x491/0x6

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/via/via-rhine.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ethernet/via/via-rhine.c
+++ b/drivers/net/ethernet/via/via-rhine.c
@@ -1615,6 +1615,7 @@ static void rhine_reset_task(struct work
 		goto out_unlock;
 
 	napi_disable(&rp->napi);
+	netif_tx_disable(dev);
 	spin_lock_bh(&rp->lock);
 
 	/* clear all descriptors */


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