linux-kernel - Re: [PATCH] mtd: st_spi_fsm: Use devm_platform_ioremap_resource() in stfsm

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Date:   Thu, 19 Sep 2019 11:10:14 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Markus Elfring <Markus.Elfring@....de>
Cc:     linux-mtd@...ts.infradead.org,
        Allison Randal <allison@...utok.net>,
        Armijn Hemel <armijn@...ldur.nl>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Himanshu Jha <himanshujha199640@...il.com>
Subject: Re: [PATCH] mtd: st_spi_fsm: Use devm_platform_ioremap_resource()
 in stfsm_probe()

Hi Markus,

Markus Elfring <Markus.Elfring@....de> wrote on Wed, 18 Sep 2019
14:50:27 +0200:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 18 Sep 2019 14:37:34 +0200
> 
> Simplify this function implementation by using a known wrapper function.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/mtd/devices/st_spi_fsm.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
> index f4d1667daaf9..5bd1c44ae529 100644
> --- a/drivers/mtd/devices/st_spi_fsm.c
> +++ b/drivers/mtd/devices/st_spi_fsm.c
> @@ -2034,13 +2034,7 @@ static int stfsm_probe(struct platform_device *pdev)
> 
>  	platform_set_drvdata(pdev, fsm);
> 
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!res) {
> -		dev_err(&pdev->dev, "Resource not found\n");
> -		return -ENODEV;
> -	}
> -
> -	fsm->base = devm_ioremap_resource(&pdev->dev, res);
> +	fsm->base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(fsm->base)) {
>  		dev_err(&pdev->dev,
>  			"Failed to reserve memory region %pR\n", res);
> --
> 2.23.0
> 


Is this even compiled tested? 'res' is not initialized anymore so you
can't use it in the error trace. I suppose you should even drop it from
the stack parameters.

Thanks,
Miquèl