[PATCH v1] treewide, serdev: change receive_buf() return type to size_t

From: Francesco Dolcini
Date: Thu Dec 14 2023 - 12:02:00 EST

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From: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>

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.

Suggested-by: Jiri Slaby <jirislaby@xxxxxxxxxx>
Link: https://lore.kernel.org/all/087be419-ec6b-47ad-851a-5e1e3ea5cfcc@xxxxxxxxxx/
Signed-off-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
---
hello,
patch is based on current linux next.

It has an obvious problem, it touches files from multiple subsystem in a single
patch that is complicated to review and eventually merge, just splitting this
would however not work, it will break bisectability and the build.

I am looking for advise on the best way to move forward.

I see the following options:
- keep it as it is
- break it down with a patch with each subsystem, and squash before applying
from a single (tty?) subsystem
- go for a multi stage approach, defining a new callback, move to it and in
the end remove the original one, likewise it was done for i2c lately

---
drivers/bluetooth/btmtkuart.c | 4 ++--
drivers/bluetooth/btnxpuart.c | 4 ++--
drivers/bluetooth/hci_serdev.c | 4 ++--
drivers/gnss/core.c | 6 +++---
drivers/gnss/serial.c | 4 ++--
drivers/gnss/sirf.c | 6 +++---
drivers/greybus/gb-beagleplay.c | 6 +++---
drivers/iio/chemical/pms7003.c | 4 ++--
drivers/iio/chemical/scd30_serial.c | 4 ++--
drivers/iio/chemical/sps30_serial.c | 4 ++--
drivers/iio/imu/bno055/bno055_ser_core.c | 4 ++--
drivers/mfd/rave-sp.c | 4 ++--
drivers/net/ethernet/qualcomm/qca_uart.c | 2 +-
drivers/nfc/pn533/uart.c | 4 ++--
drivers/nfc/s3fwrn5/uart.c | 4 ++--
drivers/platform/chrome/cros_ec_uart.c | 4 ++--
drivers/platform/surface/aggregator/core.c | 4 ++--
drivers/tty/serdev/serdev-ttyport.c | 10 ++++------
include/linux/gnss.h | 4 ++--
include/linux/serdev.h | 8 ++++----
sound/drivers/serial-generic.c | 4 ++--
21 files changed, 48 insertions(+), 50 deletions(-)

diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c
index 3c84fcbda01a..e6bc4a73c9fc 100644
--- a/drivers/bluetooth/btmtkuart.c
+++ b/drivers/bluetooth/btmtkuart.c
@@ -383,8 +383,8 @@ static void btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count)
}
}

-static ssize_t btmtkuart_receive_buf(struct serdev_device *serdev,
- const u8 *data, size_t count)
+static size_t btmtkuart_receive_buf(struct serdev_device *serdev,
+ const u8 *data, size_t count)
{
struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
index 1d592ac413d1..056bef5b2919 100644
--- a/drivers/bluetooth/btnxpuart.c
+++ b/drivers/bluetooth/btnxpuart.c
@@ -1264,8 +1264,8 @@ static const struct h4_recv_pkt nxp_recv_pkts[] = {
{ NXP_RECV_FW_REQ_V3, .recv = nxp_recv_fw_req_v3 },
};

-static ssize_t btnxpuart_receive_buf(struct serdev_device *serdev,
- const u8 *data, size_t count)
+static size_t btnxpuart_receive_buf(struct serdev_device *serdev,
+ const u8 *data, size_t count)
{
struct btnxpuart_dev *nxpdev = serdev_device_get_drvdata(serdev);

diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
index 39c8b567da3c..a3c3beb2806d 100644
--- a/drivers/bluetooth/hci_serdev.c
+++ b/drivers/bluetooth/hci_serdev.c
@@ -271,8 +271,8 @@ static void hci_uart_write_wakeup(struct serdev_device *serdev)
*
* Return: number of processed bytes
*/
-static ssize_t hci_uart_receive_buf(struct serdev_device *serdev,
- const u8 *data, size_t count)
+static size_t hci_uart_receive_buf(struct serdev_device *serdev,
+ const u8 *data, size_t count)
{
struct hci_uart *hu = serdev_device_get_drvdata(serdev);

diff --git a/drivers/gnss/core.c b/drivers/gnss/core.c
index 48f2ee0f78c4..9b8a0605ec76 100644
--- a/drivers/gnss/core.c
+++ b/drivers/gnss/core.c
@@ -317,10 +317,10 @@ EXPORT_SYMBOL_GPL(gnss_deregister_device);
*
* Must not be called for a closed device.
*/
-int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
- size_t count)
+size_t gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
+ size_t count)
{
- int ret;
+ size_t ret;

ret = kfifo_in(&gdev->read_fifo, buf, count);

diff --git a/drivers/gnss/serial.c b/drivers/gnss/serial.c
index baa956494e79..bf55aa2c1cf0 100644
--- a/drivers/gnss/serial.c
+++ b/drivers/gnss/serial.c
@@ -80,8 +80,8 @@ 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,
- const u8 *buf, size_t count)
+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);
struct gnss_device *gdev = gserial->gdev;
diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c
index 6801a8fb2040..2aae3c02156d 100644
--- a/drivers/gnss/sirf.c
+++ b/drivers/gnss/sirf.c
@@ -160,12 +160,12 @@ static const struct gnss_operations sirf_gnss_ops = {
.write_raw = sirf_write_raw,
};

-static ssize_t sirf_receive_buf(struct serdev_device *serdev,
- const u8 *buf, size_t count)
+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);
struct gnss_device *gdev = data->gdev;
- int ret = 0;
+ size_t ret = 0;

if (!data->wakeup && !data->active) {
data->active = true;
diff --git a/drivers/greybus/gb-beagleplay.c b/drivers/greybus/gb-beagleplay.c
index 2da37ff92cf1..26c95efe2fff 100644
--- a/drivers/greybus/gb-beagleplay.c
+++ b/drivers/greybus/gb-beagleplay.c
@@ -257,7 +257,7 @@ static void hdlc_rx_frame(struct gb_beagleplay *bg)
}
}

-static ssize_t hdlc_rx(struct gb_beagleplay *bg, const u8 *data, size_t count)
+static size_t hdlc_rx(struct gb_beagleplay *bg, const u8 *data, size_t count)
{
size_t i;
u8 c;
@@ -317,8 +317,8 @@ static void hdlc_deinit(struct gb_beagleplay *bg)
flush_work(&bg->tx_work);
}

-static ssize_t gb_tty_receive(struct serdev_device *sd, const u8 *data,
- size_t count)
+static size_t gb_tty_receive(struct serdev_device *sd, const u8 *data,
+ size_t count)
{
struct gb_beagleplay *bg = serdev_device_get_drvdata(sd);

diff --git a/drivers/iio/chemical/pms7003.c b/drivers/iio/chemical/pms7003.c
index b5cf15a515d2..43025866d5b7 100644
--- a/drivers/iio/chemical/pms7003.c
+++ b/drivers/iio/chemical/pms7003.c
@@ -211,8 +211,8 @@ static bool pms7003_frame_is_okay(struct pms7003_frame *frame)
return checksum == pms7003_calc_checksum(frame);
}

-static ssize_t pms7003_receive_buf(struct serdev_device *serdev, const u8 *buf,
- size_t size)
+static size_t pms7003_receive_buf(struct serdev_device *serdev, const u8 *buf,
+ size_t size)
{
struct iio_dev *indio_dev = serdev_device_get_drvdata(serdev);
struct pms7003_state *state = iio_priv(indio_dev);
diff --git a/drivers/iio/chemical/scd30_serial.c b/drivers/iio/chemical/scd30_serial.c
index a47654591e55..2adb76dbb020 100644
--- a/drivers/iio/chemical/scd30_serial.c
+++ b/drivers/iio/chemical/scd30_serial.c
@@ -174,8 +174,8 @@ static int scd30_serdev_command(struct scd30_state *state, enum scd30_cmd cmd, u
return 0;
}

-static ssize_t scd30_serdev_receive_buf(struct serdev_device *serdev,
- const u8 *buf, size_t size)
+static size_t scd30_serdev_receive_buf(struct serdev_device *serdev,
+ const u8 *buf, size_t size)
{
struct iio_dev *indio_dev = serdev_device_get_drvdata(serdev);
struct scd30_serdev_priv *priv;
diff --git a/drivers/iio/chemical/sps30_serial.c b/drivers/iio/chemical/sps30_serial.c
index 3afa89f8acc3..a6dfbe28c914 100644
--- a/drivers/iio/chemical/sps30_serial.c
+++ b/drivers/iio/chemical/sps30_serial.c
@@ -210,8 +210,8 @@ static int sps30_serial_command(struct sps30_state *state, unsigned char cmd,
return rsp_size;
}

-static ssize_t sps30_serial_receive_buf(struct serdev_device *serdev,
- const u8 *buf, size_t size)
+static size_t sps30_serial_receive_buf(struct serdev_device *serdev,
+ const u8 *buf, size_t size)
{
struct iio_dev *indio_dev = dev_get_drvdata(&serdev->dev);
struct sps30_serial_priv *priv;
diff --git a/drivers/iio/imu/bno055/bno055_ser_core.c b/drivers/iio/imu/bno055/bno055_ser_core.c
index 5677bdf4f846..694ff14a3aa2 100644
--- a/drivers/iio/imu/bno055/bno055_ser_core.c
+++ b/drivers/iio/imu/bno055/bno055_ser_core.c
@@ -378,8 +378,8 @@ static void bno055_ser_handle_rx(struct bno055_ser_priv *priv, int status)
* Also, we assume to RX one pkt per time (i.e. the HW doesn't send anything
* unless we require to AND we don't queue more than one request per time).
*/
-static ssize_t bno055_ser_receive_buf(struct serdev_device *serdev,
- const u8 *buf, size_t size)
+static size_t bno055_ser_receive_buf(struct serdev_device *serdev,
+ const u8 *buf, size_t size)
{
int status;
struct bno055_ser_priv *priv = serdev_device_get_drvdata(serdev);
diff --git a/drivers/mfd/rave-sp.c b/drivers/mfd/rave-sp.c
index b1229bb143ee..f517e59e1c01 100644
--- a/drivers/mfd/rave-sp.c
+++ b/drivers/mfd/rave-sp.c
@@ -471,8 +471,8 @@ static void rave_sp_receive_frame(struct rave_sp *sp,
rave_sp_receive_reply(sp, data, length);
}

-static ssize_t rave_sp_receive_buf(struct serdev_device *serdev,
- const u8 *buf, size_t size)
+static size_t rave_sp_receive_buf(struct serdev_device *serdev,
+ const u8 *buf, size_t size)
{
struct device *dev = &serdev->dev;
struct rave_sp *sp = dev_get_drvdata(dev);
diff --git a/drivers/net/ethernet/qualcomm/qca_uart.c b/drivers/net/ethernet/qualcomm/qca_uart.c
index 223321897b96..20f50bde82ac 100644
--- a/drivers/net/ethernet/qualcomm/qca_uart.c
+++ b/drivers/net/ethernet/qualcomm/qca_uart.c
@@ -58,7 +58,7 @@ struct qcauart {
unsigned char *tx_buffer;
};

-static ssize_t
+static size_t
qca_tty_receive(struct serdev_device *serdev, const u8 *data, size_t count)
{
struct qcauart *qca = serdev_device_get_drvdata(serdev);
diff --git a/drivers/nfc/pn533/uart.c b/drivers/nfc/pn533/uart.c
index 2eb5978bd79e..cfbbe0713317 100644
--- a/drivers/nfc/pn533/uart.c
+++ b/drivers/nfc/pn533/uart.c
@@ -203,8 +203,8 @@ static int pn532_uart_rx_is_frame(struct sk_buff *skb)
return 0;
}

-static ssize_t pn532_receive_buf(struct serdev_device *serdev,
- const u8 *data, size_t count)
+static size_t pn532_receive_buf(struct serdev_device *serdev,
+ const u8 *data, size_t count)
{
struct pn532_uart_phy *dev = serdev_device_get_drvdata(serdev);
size_t i;
diff --git a/drivers/nfc/s3fwrn5/uart.c b/drivers/nfc/s3fwrn5/uart.c
index 456d3947116c..9c09c10c2a46 100644
--- a/drivers/nfc/s3fwrn5/uart.c
+++ b/drivers/nfc/s3fwrn5/uart.c
@@ -51,8 +51,8 @@ static const struct s3fwrn5_phy_ops uart_phy_ops = {
.write = s3fwrn82_uart_write,
};

-static ssize_t s3fwrn82_uart_read(struct serdev_device *serdev,
- const u8 *data, size_t count)
+static size_t s3fwrn82_uart_read(struct serdev_device *serdev,
+ const u8 *data, size_t count)
{
struct s3fwrn82_uart_phy *phy = serdev_device_get_drvdata(serdev);
size_t i;
diff --git a/drivers/platform/chrome/cros_ec_uart.c b/drivers/platform/chrome/cros_ec_uart.c
index 68d80559fddc..8ea867c2a01a 100644
--- a/drivers/platform/chrome/cros_ec_uart.c
+++ b/drivers/platform/chrome/cros_ec_uart.c
@@ -81,8 +81,8 @@ struct cros_ec_uart {
struct response_info response;
};

-static ssize_t cros_ec_uart_rx_bytes(struct serdev_device *serdev,
- const u8 *data, size_t count)
+static size_t cros_ec_uart_rx_bytes(struct serdev_device *serdev,
+ const u8 *data, size_t count)
{
struct ec_host_response *host_response;
struct cros_ec_device *ec_dev = serdev_device_get_drvdata(serdev);
diff --git a/drivers/platform/surface/aggregator/core.c b/drivers/platform/surface/aggregator/core.c
index 9591a28bc38a..ba550eaa06fc 100644
--- a/drivers/platform/surface/aggregator/core.c
+++ b/drivers/platform/surface/aggregator/core.c
@@ -227,8 +227,8 @@ EXPORT_SYMBOL_GPL(ssam_client_bind);

/* -- Glue layer (serdev_device -> ssam_controller). ------------------------ */

-static ssize_t ssam_receive_buf(struct serdev_device *dev, const u8 *buf,
- size_t n)
+static size_t ssam_receive_buf(struct serdev_device *dev, const u8 *buf,
+ size_t n)
{
struct ssam_controller *ctrl;
int ret;
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index e94e090cf0a1..3d7ae7fa5018 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -27,19 +27,17 @@ static size_t ttyport_receive_buf(struct tty_port *port, const u8 *cp,
{
struct serdev_controller *ctrl = port->client_data;
struct serport *serport = serdev_controller_get_drvdata(ctrl);
- int ret;
+ size_t ret;

if (!test_bit(SERPORT_ACTIVE, &serport->flags))
return 0;

ret = serdev_controller_receive_buf(ctrl, cp, count);

- dev_WARN_ONCE(&ctrl->dev, ret < 0 || ret > count,
- "receive_buf returns %d (count = %zu)\n",
+ dev_WARN_ONCE(&ctrl->dev, ret > count,
+ "receive_buf returns %zu (count = %zu)\n",
ret, count);
- if (ret < 0)
- return 0;
- else if (ret > count)
+ if (ret > count)
return count;

return ret;
diff --git a/include/linux/gnss.h b/include/linux/gnss.h
index 36968a0f33e8..9857c4029e65 100644
--- a/include/linux/gnss.h
+++ b/include/linux/gnss.h
@@ -60,8 +60,8 @@ void gnss_put_device(struct gnss_device *gdev);
int gnss_register_device(struct gnss_device *gdev);
void gnss_deregister_device(struct gnss_device *gdev);

-int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
- size_t count);
+size_t gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
+ size_t count);

static inline void gnss_set_drvdata(struct gnss_device *gdev, void *data)
{
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 3fab88ba265e..ff78efc1f60d 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -27,7 +27,7 @@ struct serdev_device;
* not sleep.
*/
struct serdev_device_ops {
- ssize_t (*receive_buf)(struct serdev_device *, const u8 *, size_t);
+ size_t (*receive_buf)(struct serdev_device *, const u8 *, size_t);
void (*write_wakeup)(struct serdev_device *);
};

@@ -185,9 +185,9 @@ static inline void serdev_controller_write_wakeup(struct serdev_controller *ctrl
serdev->ops->write_wakeup(serdev);
}

-static inline ssize_t serdev_controller_receive_buf(struct serdev_controller *ctrl,
- const u8 *data,
- size_t count)
+static inline size_t serdev_controller_receive_buf(struct serdev_controller *ctrl,
+ const u8 *data,
+ size_t count)
{
struct serdev_device *serdev = ctrl->serdev;

diff --git a/sound/drivers/serial-generic.c b/sound/drivers/serial-generic.c
index d6e5aafd697c..36409a56c675 100644
--- a/sound/drivers/serial-generic.c
+++ b/sound/drivers/serial-generic.c
@@ -100,8 +100,8 @@ static void snd_serial_generic_write_wakeup(struct serdev_device *serdev)
snd_serial_generic_tx_wakeup(drvdata);
}

-static ssize_t snd_serial_generic_receive_buf(struct serdev_device *serdev,
- const u8 *buf, size_t count)
+static size_t snd_serial_generic_receive_buf(struct serdev_device *serdev,
+ const u8 *buf, size_t count)
{
int ret;
struct snd_serial_generic *drvdata = serdev_device_get_drvdata(serdev);

base-commit: 11651f8cb2e88372d4ed523d909514dc9a613ea3
--
2.25.1

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Next in thread: Francesco Dolcini: "Re: [PATCH v1] treewide, serdev: change receive_buf() return type to size_t"
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