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2ba11e4309
[ Upstream commit fd00cf81a9 ]
The receive_buf callback is supposed to return the number of bytes
processed and should specifically not return a negative errno.
Due to missing sanity checks in the serdev tty-port controller, a driver
not providing a receive_buf callback could cause the flush_to_ldisc()
worker to spin in a tight loop when the tty buffer pointers are
incremented with -EINVAL (-22).
The missing sanity checks have now been added to the tty-port
controller, but let's fix up the serdev-controller helper as well.
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>