netdev - [PATCH] net: allwinner: emac: Add missing free

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Message-Id: <1386415902-32697-1-git-send-email-maxime.ripard@free-electrons.com>
Date:	Sat,  7 Dec 2013 12:31:42 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com,
	netdev@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: [PATCH] net: allwinner: emac: Add missing free_irq

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@...e-electrons.com>
---
Hi David,

It would be great if this patch would be applied to 3.13.

Thanks,
Maxime


 drivers/net/ethernet/allwinner/sun4i-emac.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 50b853a..38aba50 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -717,8 +717,8 @@ 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 +774,8 @@ static int emac_stop(struct net_device *ndev)
 
 	emac_shutdown(ndev);
 
+	free_irq(ndev->irq, ndev);
+
 	return 0;
 }
 
-- 
1.8.4.2

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