Re: [PATCH 2/4] serdev: make synchronous write return bytes written

Make the synchronous serdev_device_write() helper behave analogous to
the asynchronous serdev_device_write_buf() by returning the number of
bytes written (or rather buffered) also on timeout.

This will allow drivers to distinguish the case where data was partially
written from the case where no data was written.

Also update the only two users that checked the return value.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/gnss/serial.c     |  2 +-
 drivers/gnss/sirf.c       |  2 +-
 drivers/tty/serdev/core.c | 12 ++++++++++--
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/gnss/serial.c b/drivers/gnss/serial.c
index 31e891f00175..def64b36d994 100644
--- a/drivers/gnss/serial.c
+++ b/drivers/gnss/serial.c

@@ -65,7 +65,7 @@ static int gnss_serial_write_raw(struct gnss_device *gdev,

        /* write is only buffered synchronously */
        ret = serdev_device_write(serdev, buf, count, MAX_SCHEDULE_TIMEOUT);
-       if (ret < 0)
+       if (ret < 0 || ret < count)