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net/fec: fix the .remove code

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The .remove code is broken in several ways.
 - mdiobus_unregister() is called twice for the same object in case of dual FEC
 - phy_disconnect() is being called when the PHY is already disconnected
 - the requested IRQ(s) are not freed
 - fec_stop() is being called with the inteface already stopped

 All of those lead to kernel crashes if the remove function is actually used.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lothar Waßmann 2011-12-07 21:59:31 +00:00 • committed by David S. Miller
commit e163cc97f9
1 changed files with 22 additions and 9 deletions
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21
drivers/net/ethernet/freescale/fec.c
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@ -259,6 +259,8 @@ struct fec_enet_private {
/* Transmitter timeout */
#define TX_TIMEOUT (2 * HZ)
static int mii_cnt;
static void *swap_buffer(void *bufaddr, int len)
{
int i;
@ -1040,9 +1042,13 @@ static int fec_enet_mii_init(struct platform_device *pdev)
*/
if ((id_entry->driver_data & FEC_QUIRK_ENET_MAC) && pdev->id > 0) {
/* fec1 uses fec0 mii_bus */
if (mii_cnt && fec0_mii_bus) {
fep->mii_bus = fec0_mii_bus;
mii_cnt++;
return 0;
}
return -ENOENT;
}
fep->mii_timeout = 0;
@ -1086,6 +1092,8 @@ static int fec_enet_mii_init(struct platform_device *pdev)
if (mdiobus_register(fep->mii_bus))
goto err_out_free_mdio_irq;
mii_cnt++;
/* save fec0 mii_bus */
if (id_entry->driver_data & FEC_QUIRK_ENET_MAC)
fec0_mii_bus = fep->mii_bus;
@ -1102,11 +1110,11 @@ err_out:
static void fec_enet_mii_remove(struct fec_enet_private *fep)
{
if (fep->phy_dev)
phy_disconnect(fep->phy_dev);
if (--mii_cnt == 0) {
mdiobus_unregister(fep->mii_bus);
kfree(fep->mii_bus->irq);
mdiobus_free(fep->mii_bus);
}
}
static int fec_enet_get_settings(struct net_device *ndev,
@ -1646,13 +1654,18 @@ fec_drv_remove(struct platform_device *pdev)
struct net_device *ndev = platform_get_drvdata(pdev);
struct fec_enet_private *fep = netdev_priv(ndev);
struct resource *r;
int i;
fec_stop(ndev);
unregister_netdev(ndev);
fec_enet_mii_remove(fep);
for (i = 0; i < FEC_IRQ_NUM; i++) {
int irq = platform_get_irq(pdev, i);
if (irq > 0)
free_irq(irq, ndev);
}
clk_disable(fep->clk);
clk_put(fep->clk);
iounmap(fep->hwp);
unregister_netdev(ndev);
free_netdev(ndev);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);