Regression in f_fastboot due to commit 6a92e9827650 ("usb: ci_udc: Check ci_ep->desc before use")

["Lothar Waßmann" <LW@KARO-electronics.de>]

Hi,

commit 6a92e9827650 ("usb: ci_udc: Check ci_ep->desc before use") has
the side effect that an empty buffer is being passed on to
rx_handler_command() in drivers/usb/gadget/f_fastboot.c upon
termination of a fastboot session which leads to a
'command  not recognized' error message being printed on the console.

Obviously without the commit the offending USB request had been silently
dropped but is now delivered to the upper levels.

I'm not sure what the correct fix would be.
Should the fastboot driver ignore the empty command buffer or should
the "Moreover, the patch gets rid of possible outstanding requests
if the endpoint's state changes to disabled." part of the commit be
reverted?


Lothar Waßmann