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treewide, serdev: change receive_buf() return type to size_t

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receive_buf() is called from ttyport_receive_buf() that expects values
">= 0" from serdev_controller_receive_buf(), change its return type from
ssize_t to size_t.

The need for this clean-up was noticed while fixing a warning, see
commit 94d0539425 ("Bluetooth: btnxpuart: fix recv_buf() return value").
Changing the callback prototype to return an unsigned seems the best way
to document the API and ensure that is properly used.

GNSS drivers implementation of serdev receive_buf() callback return
directly the return value of gnss_insert_raw(). gnss_insert_raw()
returns a signed int, however this is not an issue since the value
returned is always positive, because of the kfifo_in() implementation.
gnss_insert_raw() could be changed to return also an unsigned, however
this is not implemented here as request by the GNSS maintainer Johan
Hovold.

Suggested-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/all/087be419-ec6b-47ad-851a-5e1e3ea5cfcc@kernel.org/
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> #for-iio
Reviewed-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Acked-by: Maximilian Luz <luzmaximilian@gmail.com>  # for platform/surface
Acked-by: Lee Jones <lee@kernel.org>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240122180551.34429-1-francesco@dolcini.it
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Francesco Dolcini
2024-01-22 19:05:51 +01:00
committed by Greg Kroah-Hartman
parent cf066f9334
commit fed99212ac
19 changed files with 40 additions and 42 deletions
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2
drivers/gnss/serial.c
View File

@@ -80,7 +80,7 @@ static const struct gnss_operations gnss_serial_gnss_ops = {
.write_raw = gnss_serial_write_raw,
};
static ssize_t gnss_serial_receive_buf(struct serdev_device *serdev,
static size_t gnss_serial_receive_buf(struct serdev_device *serdev,
const u8 *buf, size_t count)
{
struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);

2
drivers/gnss/sirf.c
View File

@@ -160,7 +160,7 @@ static const struct gnss_operations sirf_gnss_ops = {
.write_raw = sirf_write_raw,
};
static ssize_t sirf_receive_buf(struct serdev_device *serdev,
static size_t sirf_receive_buf(struct serdev_device *serdev,
const u8 *buf, size_t count)
{
struct sirf_data *data = serdev_device_get_drvdata(serdev);