usb: gadget: ether: Fix race between gether_disconnect and rx_submit
commit d29fcf70 upstream. On spin lock release in rx_submit, gether_disconnect get a chance to run, it makes port_usb NULL, rx_submit access NULL port USB, hence null pointer crash. Fixed by releasing the lock in rx_submit after port_usb is used. Fixes: 2b3d942c ("usb ethernet gadget: split out network core") Signed-off-by: Kiruthika Varadarajan <Kiruthika.Varadarajan@harman.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> [bwh: Backported to 3.16: adjust filename] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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