usbnet: smsc75xx: don't recover device if suspend fails in system sleep

If suspend callback fails in system sleep context, usb core will
ignore the failure and let system sleep go ahead further, so
this patch doesn't recover device under this situation.

Also add comments on this case.

Acked-by: David S. Miller <davem@davemloft.net>
Cc: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index 9abe51710f229377cb9f405ffedb198eab580738..21b607ab86f2fa87855378c3e79b84475f8e07d8 100644 (file)
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -2011,7 +2011,11 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
        ret = smsc75xx_enter_suspend0(dev);
 
 done:
-       if (ret)
+       /*
+        * TODO: resume() might need to handle the suspend failure
+        * in system sleep
+        */
+       if (ret && PMSG_IS_AUTO(message))
                usbnet_resume(intf);
        return ret;
 }