net: usb: smsc95xx: fix mtu
Make smsc95xx recalculate the hard_mtu after adjusting the hard_header_len. Without this, usbnet adjusts the MTU down to 1488 bytes, and the host is unable to receive standard 1500-byte frames from the device. Inspired by same fix on cdc_eem 78fb72f7. Tested on ARM/Beagle. Signed-off-by: NStephane Fillod <fillods@users.sf.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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