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Date: Wed, 7 Jul 2021 10:14:48 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Tamseel Shams <m.shams@...sung.com>,
krzysztof.kozlowski@...onical.com, gregkh@...uxfoundation.org
Cc: linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org,
linux-kernel@...r.kernel.org, alim.akhtar@...sung.com
Subject: Re: [PATCH v3] serial: samsung: Checks the return value of function
On 06. 07. 21, 8:19, Tamseel Shams wrote:
> "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 <m.shams@...sung.com>
> ---
> Changes since v1:
> 1. Added support to unregister driver on failure of "uart_add_one_port"
> function call.
> 2. Commit message updated.
>
> Changes since v2:
> 1. Added support to unwind clocks on failure of "uart_add_one_port"
> function call.
>
> drivers/tty/serial/samsung_tty.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 9fbc61151c2e..a3f3a17fb54b 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 +2276,17 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
> probe_index++;
>
> return 0;
> +
> +add_port_error:
> + ourport->port.mapbase = 0;
> + clk_disable_unprepare(ourport->clk);
> + clk_put(ourport->clk);
> + if (!IS_ERR(ourport->baudclk)) {
> + clk_disable_unprepare(ourport->baudclk);
> + clk_put(ourport->baudclk);
> + }
LGTM, now I only wonder why s3c24xx_serial_remove() does not put clocks?
> + uart_unregister_driver(&s3c24xx_uart_drv);
> + return ret;
> }
>
> static int s3c24xx_serial_remove(struct platform_device *dev)
>
--
js
suse labs
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