netdev - Re: [PATCH v5 1/1 net] net: fec: fix kernel oops when plug/unplug cable many times

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Message-ID: <CAOMZO5AUk0GHKj857a0=Q-dxhpO2s7uatXurNVZV_UmEmtGsqQ@mail.gmail.com>
Date:	Tue, 14 May 2013 16:27:04 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	Frank Li <Frank.Li@...escale.com>, romieu@...zoreil.com,
	r.schwebel@...gutronix.de, davem@...emloft.net,
	l.stach@...gutronix.de, netdev@...r.kernel.org, lznuaa@...il.com
Subject: Re: [PATCH v5 1/1 net] net: fec: fix kernel oops when plug/unplug
 cable many times

On Mon, May 13, 2013 at 1:57 AM, Shawn Guo <shawn.guo@...aro.org> wrote:

> The patch has landed on 3.10-rc1.  Seems that it introduces a lock
> warning as below.  Turn on CONFIG_PROVE_LOCKING and you will be able
> to see it.

This makes the warning goes away on mx28:

--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -451,7 +451,6 @@ fec_restart(struct net_device *ndev, int duplex)
                netif_device_detach(ndev);
                napi_disable(&fep->napi);
                netif_stop_queue(ndev);
-               netif_tx_lock(ndev);
        }

        /* Whack a reset.  We should wait for this. */
@@ -619,7 +618,6 @@ fec_restart(struct net_device *ndev, int duplex)
                netif_device_attach(ndev);
                napi_enable(&fep->napi);
                netif_wake_queue(ndev);
-               netif_tx_unlock(ndev);
        }
 }

,but not sure if it looks OK.
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