From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To: Tamseel Shams <m.shams@samsung.com>,
gregkh@linuxfoundation.org, jirislaby@kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org, alim.akhtar@samsung.com
Subject: Re: [PATCH v2] serial: samsung: Checks the return value of function
Date: Thu, 1 Jul 2021 08:36:21 +0200 [thread overview]
Message-ID: <0c608d5e-f59b-3f05-a461-2205cece4b7e@canonical.com> (raw)
In-Reply-To: <20210630133359.59275-1-m.shams@samsung.com>
On 30/06/2021 15:33, 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@samsung.com>
> ---
> 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
next prev parent reply other threads:[~2021-07-01 6:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210630133115epcas5p1706041f122819d47b18b83853b49694e@epcas5p1.samsung.com>
2021-06-30 13:33 ` [PATCH v2] serial: samsung: Checks the return value of function Tamseel Shams
2021-07-01 6:36 ` Krzysztof Kozlowski [this message]
2021-07-05 11:04 ` M Tamseel Shams
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