netdev - [PATCH v2] net/fec: fix pm to survive to suspend/resume

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Date:	Sat, 29 May 2010 22:04:50 +0200
From:	Eric Bénard <eric@...rea.com>
To:	netdev@...r.kernel.org
Cc:	s.hauer@...gutronix.de, sshtylyov@...sta.com,
	linux-arm-kernel@...ts.infradead.org, fabioestevam@...oo.com,
	davem@...emloft.net
Subject: [PATCH v2] net/fec: fix pm to survive to suspend/resume

* in the actual driver, calling fec_stop and fec_enet_init doesn't
allow to have a working network interface at resume (where a
ifconfig down and up is required to recover the interface)
* by using fec_enet_close and fec_enet_open, this patch solves this
problem and handle the case where the link changed between suspend
and resume
* this patch also disable clock at suspend and reenable it at resume

Signed-off-by: Eric Bénard <eric@...rea.com>
Cc: s.hauer@...gutronix.de
Cc: sshtylyov@...sta.com
Cc: linux-arm-kernel@...ts.infradead.org
Cc: fabioestevam@...oo.com
Cc: davem@...emloft.net
---
 drivers/net/fec.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index 9b4e8f7..40ffdb8 100644
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -1975,10 +1975,9 @@ fec_suspend(struct platform_device *dev, pm_message_t state)
 
 	if (ndev) {
 		fep = netdev_priv(ndev);
-		if (netif_running(ndev)) {
-			netif_device_detach(ndev);
-			fec_stop(ndev);
-		}
+		if (netif_running(ndev))
+			fec_enet_close(ndev);
+		clk_disable(fep->clk);
 	}
 	return 0;
 }
@@ -1987,12 +1986,13 @@ static int
 fec_resume(struct platform_device *dev)
 {
 	struct net_device *ndev = platform_get_drvdata(dev);
+	struct fec_enet_private *fep;
 
 	if (ndev) {
-		if (netif_running(ndev)) {
-			fec_enet_init(ndev, 0);
-			netif_device_attach(ndev);
-		}
+		fep = netdev_priv(ndev);
+		clk_enable(fep->clk);
+		if (netif_running(ndev))
+			fec_enet_open(ndev);
 	}
 	return 0;
 }
-- 
1.6.3.3

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