linux-kernel - Re: [PATCH v2] serial: 8250: fix error handling in of_platform_serial

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Message-ID: <CAHp75VeVKJhDP+Q9xLZZyhLeSv5CNFKKs5DC_EaegaX=SNcLeA@mail.gmail.com>
Date:   Tue, 18 Jul 2017 18:06:04 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Arnd Bergmann <arnd@...db.de>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        ldv-project@...uxtesting.org
Subject: Re: [PATCH v2] serial: 8250: fix error handling in of_platform_serial_probe()

On Tue, Jul 18, 2017 at 2:32 PM, Alexey Khoroshilov
<khoroshilov@...ras.ru> wrote:
> clk_disable_unprepare(info->clk) is missed in of_platform_serial_probe(),
> while irq_dispose_mapping(port->irq) is missed in of_platform_serial_setup().
>
> Found by Linux Driver Verification project (linuxtesting.org).
>

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

(I esp. like the part of new label namings)

> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> ---
> v2: Rebase on top of e2860e1f62f2 "serial: 8250_of: Add reset support"
>
>  drivers/tty/serial/8250/8250_of.c | 23 ++++++++++++++---------
>  1 file changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
> index 0cf95fd..539f1a6 100644
> --- a/drivers/tty/serial/8250/8250_of.c
> +++ b/drivers/tty/serial/8250/8250_of.c
> @@ -88,7 +88,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
>         ret = of_address_to_resource(np, 0, &resource);
>         if (ret) {
>                 dev_warn(&ofdev->dev, "invalid address\n");
> -               goto out;
> +               goto err_unprepare;
>         }
>
>         spin_lock_init(&port->lock);
> @@ -130,16 +130,16 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
>                         dev_warn(&ofdev->dev, "unsupported reg-io-width (%d)\n",
>                                  prop);
>                         ret = -EINVAL;
> -                       goto out;
> +                       goto err_dispose;
>                 }
>         }
>
>         info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
>         if (IS_ERR(info->rst))
> -               goto out;
> +               goto err_dispose;
>         ret = reset_control_deassert(info->rst);
>         if (ret)
> -               goto out;
> +               goto err_dispose;
>
>         port->type = type;
>         port->uartclk = clk;
> @@ -167,7 +167,9 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
>                 port->handle_irq = fsl8250_handle_irq;
>
>         return 0;
> -out:
> +err_dispose:
> +       irq_dispose_mapping(port->irq);
> +err_unprepare:
>         if (info->clk)
>                 clk_disable_unprepare(info->clk);
>         return ret;
> @@ -201,7 +203,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
>         memset(&port8250, 0, sizeof(port8250));
>         ret = of_platform_serial_setup(ofdev, port_type, &port8250.port, info);
>         if (ret)
> -               goto out;
> +               goto err_setup;
>
>         if (port8250.port.fifosize)
>                 port8250.capabilities = UART_CAP_FIFO;
> @@ -217,15 +219,18 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
>
>         ret = serial8250_register_8250_port(&port8250);
>         if (ret < 0)
> -               goto out;
> +               goto err_register;
>
>         info->type = port_type;
>         info->line = ret;
>         platform_set_drvdata(ofdev, info);
>         return 0;
> -out:
> -       kfree(info);
> +err_register:
>         irq_dispose_mapping(port8250.port.irq);
> +       if (info->clk)
> +               clk_disable_unprepare(info->clk);
> +err_setup:
> +       kfree(info);
>         return ret;
>  }
>
> --
> 2.7.4
>



-- 
With Best Regards,
Andy Shevchenko