Re: [PATCH v2] serial: samsung: Checks the return value of function
From: Krzysztof Kozlowski <hidden>
Date: 2021-07-01 06:36:28
Also in:
linux-arm-kernel, linux-samsung-soc, lkml
On 30/06/2021 15:33, Tamseel Shams wrote:
quoted hunk ↗ jump to hunk
"uart_add_one_port" function call may fail and return some error code, so adding a check for return value. If it is returning some error code, then displaying the result, unregistering the driver and then returning from probe function with error code. Signed-off-by: Tamseel Shams <redacted> --- Changes since v1: 1. Added support to unregister driver on failure of "uart_add_onr_port" function call. 2. Commit message updated. drivers/tty/serial/samsung_tty.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c index 9fbc61151c2e..188e2d2da201 100644 --- a/drivers/tty/serial/samsung_tty.c +++ b/drivers/tty/serial/samsung_tty.c@@ -2253,7 +2253,11 @@ static int s3c24xx_serial_probe(struct platform_device *pdev) } dev_dbg(&pdev->dev, "%s: adding port\n", __func__); - uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); + ret = uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to add uart port, err %d\n", ret); + goto add_port_error; + } platform_set_drvdata(pdev, &ourport->port); /*@@ -2272,6 +2276,11 @@ static int s3c24xx_serial_probe(struct platform_device *pdev) probe_index++; return 0; + +add_port_error:
You did not unwind fully s3c24xx_serial_init_port() - clocks.
+ ourport->port.mapbase = 0; + uart_unregister_driver(&s3c24xx_uart_drv); + return ret; } static int s3c24xx_serial_remove(struct platform_device *dev)
Best regards, Krzysztof