netdev - [PATCH] gianfar: ethernet vanishes after restoring from hibernation

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Message-Id: <1352472231-17927-1-git-send-email-paul.gortmaker@windriver.com>
Date:	Fri,  9 Nov 2012 09:43:51 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	netdev@...r.kernel.org
Cc:	Wang Dongsheng <dongsheng.wang@...escale.com>,
	Claudiu Manoil <claudiu.manoil@...escale.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [PATCH] gianfar: ethernet vanishes after restoring from hibernation

From: Wang Dongsheng <dongsheng.wang@...escale.com>

If a gianfar ethernet device is down prior to hibernating a
system, it will no longer be present upon system restore.

For example:

	~# ifconfig eth0 down
	~# echo disk > /sys/power/state

	  <trigger a restore from hibernation>

	~# ifconfig eth0 up
	SIOCSIFFLAGS: No such device

This happens because the restore function bails out early upon
finding devices that were not up at hibernation.  In doing so,
it never gets to the netif_device_attach call at the end of
the restore function.  Adding the netif_device_attach as done
here also makes the gfar_restore code consistent with what is
done in the gfar_resume code.

Cc: Claudiu Manoil <claudiu.manoil@...escale.com>
Signed-off-by: Wang Dongsheng <dongsheng.wang@...escale.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
[v2: expand on details in commit log a bit more, to superceed
 v1 at http://patchwork.ozlabs.org/patch/197412/ ]

 drivers/net/ethernet/freescale/gianfar.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 1d03dcd..19ac096 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -1353,8 +1353,11 @@ static int gfar_restore(struct device *dev)
 	struct gfar_private *priv = dev_get_drvdata(dev);
 	struct net_device *ndev = priv->ndev;
 
-	if (!netif_running(ndev))
+	if (!netif_running(ndev)) {
+		netif_device_attach(ndev);
+
 		return 0;
+	}
 
 	gfar_init_bds(ndev);
 	init_registers(ndev);
-- 
1.8.0

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