spi: sunplus: handle signal interruption in transfer wait

wait_for_completion_interruptible_timeout() returns -ERESTARTSYS when
interrupted by a signal, 0 on timeout, and positive on success. The
previous check was:

    if (!wait_for_completion_interruptible_timeout(...))

SIGKILL caused the interrupted path to fall through as if the transfer
succeeded. The loop then re-entered mutex_lock() on the next
iteration, which is TASK_UNINTERRUPTIBLE. The process could not be
killed while blocked there.

Check ret <= 0 and return -EINTR for the interrupted case so the process
can exit promptly on SIGKILL.

Signed-off-by: Andrew Gaylard <ag@ffroot.co.za>
Link: https://patch.msgid.link/20260820125835.1584270-1-ag@ffroot.co.za
Signed-off-by: Mark Brown <broonie@kernel.org>

0 files changed, 0 insertions, 0 deletions