usbnet: smsc95xx: disable carrier check while suspending

[ Upstream commit 7b900ead6cc66b2ee873cb042dfba169aa68b56c ]

We need to make sure, that the carrier check polling is disabled
while suspending. Otherwise we can end up with usbnet_read_cmd()
being issued when only usbnet_read_cmd_nopm() is allowed. If this
happens, read operations lock up.

Fixes: d69d169493 ("usbnet: smsc95xx: fix link detection for disabled autonegotiation")
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Raghuram Chary J <RaghuramChary.Jallipalli@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index f74739664f8959b7d8fc11090dad4dcb9059fd3d..2f65975a121f0c435c4d9e610685e2db0f22f7fe 100644 (file)
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -1600,6 +1600,8 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
                return ret;
        }
 
+       cancel_delayed_work_sync(&pdata->carrier_check);
+
        if (pdata->suspend_flags) {
                netdev_warn(dev->net, "error during last resume\n");
                pdata->suspend_flags = 0;
@@ -1842,6 +1844,11 @@ done:
         */
        if (ret && PMSG_IS_AUTO(message))
                usbnet_resume(intf);
+
+       if (ret)
+               schedule_delayed_work(&pdata->carrier_check,
+                                     CARRIER_CHECK_DELAY);
+
        return ret;
 }