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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>
This commit is contained in:
Soohoon Lee 2016-06-29 15:07:21 -04:00 committed by David S. Miller
parent fedbb6b4ff
commit 43daa96b16
1 changed files with 7 additions and 3 deletions
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6
drivers/net/usb/usbnet.c
View File

@ -395,8 +395,11 @@ int usbnet_change_mtu (struct net_device *net, int new_mtu)
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 */
@ -1509,6 +1512,7 @@ static void usbnet_bh (unsigned long param)
netif_device_present (dev->net) &&
netif_carrier_ok(dev->net) &&
!timer_pending(&dev->delay) &&
!test_bit(EVENT_RX_PAUSED, &dev->flags) &&
!test_bit(EVENT_RX_HALT, &dev->flags)) {
int temp = dev->rxq.qlen;