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NET: fec: only enable napi if we are successful

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If napi is left enabled after a failed attempt to bring the interface
up, we BUG:

fec 2188000.ethernet eth0: no PHY, assuming direct connection to switch
libphy: PHY fixed-0:00 not found
fec 2188000.ethernet eth0: could not attach to PHY
------------[ cut here ]------------
kernel BUG at include/linux/netdevice.h:502!
Internal error: Oops - BUG: 0 [#1] SMP ARM
...
PC is at fec_enet_open+0x4d0/0x500
LR is at __dev_open+0xa4/0xfc

Only enable napi after we are past all the failure paths.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2014-02-18 12:55:42 +00:00 committed by David S. Miller
parent d7cf0c34af
commit ce5eaf023a
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/freescale/fec_main.c
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@ -1778,8 +1778,6 @@ fec_enet_open(struct net_device *ndev)
struct fec_enet_private *fep = netdev_priv(ndev);
int ret;
napi_enable(&fep->napi);
/* I should reset the ring buffers here, but I don't yet know
* a simple way to do that.
*/
@ -1794,6 +1792,8 @@ fec_enet_open(struct net_device *ndev)
fec_enet_free_buffers(ndev);
return ret;
}
napi_enable(&fep->napi);
phy_start(fep->phy_dev);
netif_start_queue(ndev);
fep->opened = 1;