usbnet: Stop RX Q on MTU change
When MTU is changed unlink_urbs() flushes RX Q but mean while usbnet_bh()
can fill up the Q at the same time.
Depends on which HCD is down there unlink takes long time then the flush
never ends.
Signed-off-by: Soohoon Lee <soohoon.lee@f5.com>
Reviewed-by: Kimball Murray <kmurray@f5.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 61ba464..6086a01 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -395,8 +395,11 @@
dev->hard_mtu = net->mtu + net->hard_header_len;
if (dev->rx_urb_size == old_hard_mtu) {
dev->rx_urb_size = dev->hard_mtu;
- if (dev->rx_urb_size > old_rx_urb_size)
+ if (dev->rx_urb_size > old_rx_urb_size) {
+ usbnet_pause_rx(dev);
usbnet_unlink_rx_urbs(dev);
+ usbnet_resume_rx(dev);
+ }
}
/* max qlen depend on hard_mtu and rx_urb_size */
@@ -1508,8 +1511,9 @@
} else if (netif_running (dev->net) &&
netif_device_present (dev->net) &&
netif_carrier_ok(dev->net) &&
- !timer_pending (&dev->delay) &&
- !test_bit (EVENT_RX_HALT, &dev->flags)) {
+ !timer_pending(&dev->delay) &&
+ !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
+ !test_bit(EVENT_RX_HALT, &dev->flags)) {
int temp = dev->rxq.qlen;
if (temp < RX_QLEN(dev)) {