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USB: serial: make usb_serial_driver::write_room return uint
Jiri Slaby authored
Line disciplines expect a positive value or zero returned from
tty->ops->write_room (invoked by tty_write_room). Both of them are being
updated to return an unsigned int. Switch also
usb_serial_driver::write_room and all its users.
Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
[ johan: amend commit message, drop unrelated comment change ]
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
94cc7aea
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