linux-kernel - Re: [PATCH 3/3] serial: sprd: cleanup the sprd_port when return -EPROBE

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Date:   Tue, 17 Mar 2020 14:21:57 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     Chunyan Zhang <zhang.lyra@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>
Subject: Re: [PATCH 3/3] serial: sprd: cleanup the sprd_port when return -EPROBE_DEFER

On Mon, Mar 16, 2020 at 6:19 PM Chunyan Zhang <zhang.lyra@...il.com> wrote:
>
> From: Chunyan Zhang <chunyan.zhang@...soc.com>
>
> cleanup the sprd_port for the device when its .probe() would be called
> later, and then alloc memory for its sprd_port again.
>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
> ---
>  drivers/tty/serial/sprd_serial.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
> index 914862844790..9917d7240172 100644
> --- a/drivers/tty/serial/sprd_serial.c
> +++ b/drivers/tty/serial/sprd_serial.c
> @@ -1230,8 +1230,13 @@ static int sprd_probe(struct platform_device *pdev)
>         up->has_sysrq = IS_ENABLED(CONFIG_SERIAL_SPRD_CONSOLE);
>
>         ret = sprd_clk_init(up);
> -       if (ret)
> +       if (ret) {
> +               if (ret == -EPROBE_DEFER) {

I think we can remove the condition and devm_kfree() here, just
simplify the code as below?
if (ret) {
       sprd_port[index] = NULL;
       return ret;
}

> +                       devm_kfree(&pdev->dev, sprd_port[index]);
> +                       sprd_port[index] = NULL;
> +               }
>                 return ret;
> +       }
>
>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>         up->membase = devm_ioremap_resource(&pdev->dev, res);
> --
> 2.20.1
>


-- 
Baolin Wang