linux-kernel - Re: [PATCH] mtd: devices: check mtd_device

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Date:   Wed, 21 Mar 2018 09:01:23 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Arushi Singhal <arushisinghal19971997@...il.com>
Cc:     dwmw2@...radead.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Brian Norris <computersforpeace@...il.com>
Subject: Re: [PATCH] mtd: devices: check mtd_device_register() return code

Hi Arushi,

On Wed, 21 Mar 2018 11:07:09 +0530, Arushi Singhal
<arushisinghal19971997@...il.com> wrote:

> stfsm_probe() misses error handling of mtd_device_register().
> 
> Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.com>
> ---
>  drivers/mtd/devices/st_spi_fsm.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
> index 7bc29d7..e1aa4f8 100644
> --- a/drivers/mtd/devices/st_spi_fsm.c
> +++ b/drivers/mtd/devices/st_spi_fsm.c
> @@ -2125,7 +2125,13 @@ static int stfsm_probe(struct platform_device *pdev)
>  		(long long)fsm->mtd.size, (long long)(fsm->mtd.size >> 20),
>  		fsm->mtd.erasesize, (fsm->mtd.erasesize >> 10));
>  
> -	return mtd_device_register(&fsm->mtd, NULL, 0);
> +	ret = mtd_device_register(&fsm->mtd, NULL, 0);
> +	if (ret) {
> +		pr_err("Failed to register device\n");
> +		return ret;
> +	}
> +
> +	return 0;

I don't think this bring anything. However, if you want to fix
something you should jump below on error to disable the clock instead
of returning 'ret' directly.

>  
>  err_clk_unprepare:
>  	clk_disable_unprepare(fsm->clk);

Thanks,
Miquèl

-- 
Miquel Raynal, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com