rpmsg: virtio: fix error handling in TX buffer wait

The TX buffer wait loop in rpmsg_send_offchannel_raw() ignores the
possibility of wait_event_interruptible_timeout() returning a
negative value, which happens when the wait is interrupted by a
signal. In that case the loop spins back around and re-arms the
wait instead of propagating the signal, which can stall a task
that is trying to be killed.

Separately, on a genuine timeout (return value 0) the function
returns -ERESTARTSYS, which is reserved for signal-interrupted
syscalls that the kernel may restart. A timeout is not a signal
and should not be treated as restartable; return -ETIMEDOUT
instead.

Handle both cases explicitly: return err directly when negative,
and return -ETIMEDOUT on timeout.

Fixes: bcabbccabffe ("rpmsg: add virtio-based remote processor messaging bus")
Signed-off-by: Atul Akella <atul.akella@gmail.com>
Link: https://lore.kernel.org/r/20261013160055.1362-1-atul.akella@gmail.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

0 files changed, 0 insertions, 0 deletions