[3.11.y.z extended stable] Patch "net: allwinner: emac: Add missing free_irq" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    net: allwinner: emac: Add missing free_irq

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 402d72c397d4aac5b403d258397e92eb58596a22 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime.ripard at free-electrons.com>
Date: Tue, 10 Dec 2013 19:40:43 +0100
Subject: net: allwinner: emac: Add missing free_irq

commit e9c56f8d2f851fb6d6ce6794c0f5463b862a878e upstream.

The sun4i-emac driver uses devm_request_irq at .ndo_open time, but relies on
the managed device mechanism to actually free it. This causes an issue whenever
someone wants to restart the interface, the interrupt still being held, and not
yet released.

Fall back to using the regular request_irq at .ndo_open time, and introduce a
free_irq during .ndo_stop.

Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/ethernet/allwinner/sun4i-emac.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 50b853a..46dfb13 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -717,8 +717,7 @@ static int emac_open(struct net_device *dev)
 	if (netif_msg_ifup(db))
 		dev_dbg(db->dev, "enabling %s\n", dev->name);

-	if (devm_request_irq(db->dev, dev->irq, &emac_interrupt,
-			     0, dev->name, dev))
+	if (request_irq(dev->irq, &emac_interrupt, 0, dev->name, dev))
 		return -EAGAIN;

 	/* Initialize EMAC board */
@@ -774,6 +773,8 @@ static int emac_stop(struct net_device *ndev)

 	emac_shutdown(ndev);

+	free_irq(ndev->irq, ndev);
+
 	return 0;
 }

--
1.8.3.2