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usbnet: limit max_mtu based on device's hard_mtu #7203

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usbnet: limit max_mtu based on device's hard_mtu #7203

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9 changes: 6 additions & 3 deletions drivers/net/usb/usbnet.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1797,9 +1797,12 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
if ((dev->driver_info->flags & FLAG_NOARP) != 0)
net->flags |= IFF_NOARP;

/* maybe the remote can't receive an Ethernet MTU */
if (net->mtu > (dev->hard_mtu - net->hard_header_len))
net->mtu = dev->hard_mtu - net->hard_header_len;
if (net->max_mtu > (dev->hard_mtu - net->hard_header_len))
net->max_mtu = dev->hard_mtu - net->hard_header_len;

if (net->mtu > net->max_mtu)
net->mtu = net->max_mtu;

} else if (!info->in || !info->out)
status = usbnet_get_endpoints (dev, udev);
else {
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