linux-kernel - Re: [PATCH] floppy: add missing put

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Date:   Tue, 18 Jul 2023 10:51:53 +0200
From:   Kjetil Oftedal <oftedal@...il.com>
To:     sunran001@...suo.com
Cc:     davem@...emloft.net, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] floppy: add missing put_device()

On Tue, 18 Jul 2023 at 10:15, <sunran001@...suo.com> wrote:
>
> The of_find_device_by_node() takes a reference to the underlying device
> structure, we should release that reference.
>
> Detected by coccinelle with the following ERROR:
> ./arch/sparc/include/asm/floppy_64.h:595:3-9: ERROR: missing put_device;
> call of_find_device_by_node on line 589, but without a corresponding
> object release within this function.
>
> Signed-off-by: Ran Sun <sunran001@...suo.com>
> ---
>   arch/sparc/include/asm/floppy_64.h | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/arch/sparc/include/asm/floppy_64.h
> b/arch/sparc/include/asm/floppy_64.h
> index 070c8c1f5c8f..e74a4d4e6519 100644
> --- a/arch/sparc/include/asm/floppy_64.h
> +++ b/arch/sparc/include/asm/floppy_64.h
> @@ -592,6 +592,7 @@ static unsigned long __init sun_floppy_init(void)
>
>           state_prop = of_get_property(op->dev.of_node, "status", NULL);
>           if (state_prop && !strncmp(state_prop, "disabled", 8))
> +            put_device(&op->dev);

>From the same domain as "Liubin" earlier, introducing the same kind of error
(Not adding curly braces)


>               return 0;
>
>           FLOPPY_IRQ = op->archdata.irqs[0];