netdev - [PATCH net-next 4/7] net:fec: ensure that a disconnected phy isn't configured

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Date:	Tue, 29 Apr 2014 20:09:07 +0800
From:	Frank Li <Frank.Li@...escale.com>
To:	<lznuaa@...il.com>, <shawn.guo@...aro.org>, <B38611@...escale.com>,
	<davem@...emloft.net>, <rmk+kernel@....linux.org.uk>
CC:	<linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
	Frank Li <Frank.Li@...escale.com>
Subject: [PATCH net-next 4/7] net:fec: ensure that a disconnected phy isn't configured

From: Russell King <rmk+kernel@....linux.org.uk>

When we disconnect from a phy, we should forget our pointer to it so we
don't accidentally try to configure it.  We handle a NULL phy pointer
correctly in most places, except fec_enet_set_pauseparam().  Fix this
too.

Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Frank Li <Frank.Li@...escale.com>
---
 drivers/net/ethernet/freescale/fec_main.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index b7a5614..9de899e 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1496,6 +1496,9 @@ static int fec_enet_set_pauseparam(struct net_device *ndev,
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
 
+	if (!fep->phy_dev)
+		return -ENODEV;
+
 	if (pause->tx_pause != pause->rx_pause) {
 		netdev_info(ndev,
 			"hardware only support enable/disable both tx and rx");
@@ -1800,6 +1803,7 @@ fec_enet_close(struct net_device *ndev)
 
 	phy_stop(fep->phy_dev);
 	phy_disconnect(fep->phy_dev);
+	fep->phy_dev = NULL;
 
 	fec_enet_free_buffers(ndev);
 
-- 
1.7.8

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