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usbnet: smsc95xx: add reset_resume function with reset operation

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The smsc95xx needs to resume with reset operation. Otherwise it causes
system hang by network error like below after resume. This case appears
on odroid u3 board.

[    9.727600] smsc95xx 1-2:1.0 eth0: kevent 2 may have been dropped
[    9.727648] smsc95xx 1-2:1.0 eth0: kevent 2 may have been dropped
[    9.727689] smsc95xx 1-2:1.0 eth0: kevent 2 may have been dropped
[    9.727728] smsc95xx 1-2:1.0 eth0: kevent 2 may have been dropped
[    9.729486] PM: resume of devices complete after 2011.219 msecs
[   10.117609] Restarting tasks ... done.
[   11.725099] smsc95xx 1-2:1.0 eth0: kevent 2 may have been dropped
[   13.480846] smsc95xx 1-2:1.0 eth0: kevent 2 may have been dropped
[   13.481361] smsc95xx 1-2:1.0 eth0: kevent 2 may have been dropped
...

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joonyoung Shim 2014-07-10 11:49:42 +09:00 committed by David S. Miller
parent a12f78c582
commit b4df480f68
1 changed files with 13 additions and 1 deletions
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14
drivers/net/usb/smsc95xx.c
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@ -1714,6 +1714,18 @@ static int smsc95xx_resume(struct usb_interface *intf)
return ret;
}
static int smsc95xx_reset_resume(struct usb_interface *intf)
{
struct usbnet *dev = usb_get_intfdata(intf);
int ret;
ret = smsc95xx_reset(dev);
if (ret < 0)
return ret;
return smsc95xx_resume(intf);
}
static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
{
skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
@ -2004,7 +2016,7 @@ static struct usb_driver smsc95xx_driver = {
.probe = usbnet_probe,
.suspend = smsc95xx_suspend,
.resume = smsc95xx_resume,
.reset_resume = smsc95xx_resume,
.reset_resume = smsc95xx_reset_resume,
.disconnect = usbnet_disconnect,
.disable_hub_initiated_lpm = 1,
.supports_autosuspend = 1,