From: Francesco Dolcini francesco.dolcini@toradex.com
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 94d053942544 ("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 --- v1: - https://lore.kernel.org/all/20231214170146.641783-1-francesco@dolcini.it/ v2: - rebased on 6.8-rc1 - add acked-by Jonathan - do not change gnss_insert_raw() - do not change the code style of the gnss code - commit message improvements, explain the reasons for doing only minimal changes on the GNSS part --- drivers/bluetooth/btmtkuart.c | 4 ++-- drivers/bluetooth/btnxpuart.c | 4 ++-- drivers/bluetooth/hci_serdev.c | 4 ++-- drivers/gnss/serial.c | 2 +- drivers/gnss/sirf.c | 2 +- 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/serdev.h | 8 ++++---- sound/drivers/serial-generic.c | 4 ++-- 19 files changed, 40 insertions(+), 42 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/serial.c b/drivers/gnss/serial.c index baa956494e79..0e43bf6294f8 100644 --- a/drivers/gnss/serial.c +++ b/drivers/gnss/serial.c @@ -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); diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c index 6801a8fb2040..79375d14bbb6 100644 --- a/drivers/gnss/sirf.c +++ b/drivers/gnss/sirf.c @@ -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); diff --git a/drivers/greybus/gb-beagleplay.c b/drivers/greybus/gb-beagleplay.c index c3e90025064b..33f8fad70260 100644 --- a/drivers/greybus/gb-beagleplay.c +++ b/drivers/greybus/gb-beagleplay.c @@ -271,7 +271,7 @@ 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; @@ -331,8 +331,8 @@ 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 6ff84b2600c5..62a6613fb070 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/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);