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@free-electrons.com>
Cc: stable@vger.kernel.org # 3.11+
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 50b853a79d7787c73d0ea8d0ac1f1e0853ac2adf..46dfb1378c17cac79064a5f3f809e94a1d75c584 100644 (file)
--- 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;
 }