linux-kernel - Re: [PATCH v2] mtd: plat-ram: use release_mem_region instead of release

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Date:   Thu, 17 Aug 2017 15:29:10 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Anton Vasilyev <vasilyev@...ras.ru>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: Re: [PATCH v2] mtd: plat-ram: use release_mem_region instead of
 release_resource

And now the commit title is no longer matching the patch content.

Le Wed, 16 Aug 2017 19:22:17 +0300,
Anton Vasilyev <vasilyev@...ras.ru> a écrit :

> Replace ioremap() and request_mem_region() by devm_ioremap_resource().
> 
> Found by Linux Driver Verification project (linuxtesting.org).

Maybe you should describe in more details what linuxtesting complained
about and why you decided to fix it using devm_ioremap_resource().

> 
> Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
> Suggested-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
> v1: Fix commit based on Boris Brezillon review
> ---
> v2: Change commit by Boris Brezillon solution
> ---
>  drivers/mtd/maps/plat-ram.c | 38 ++++----------------------------------
>  1 file changed, 4 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/mtd/maps/plat-ram.c b/drivers/mtd/maps/plat-ram.c
> index 5157289..6d9a4d6 100644
> --- a/drivers/mtd/maps/plat-ram.c
> +++ b/drivers/mtd/maps/plat-ram.c
> @@ -43,7 +43,6 @@ struct platram_info {
>  	struct device		*dev;
>  	struct mtd_info		*mtd;
>  	struct map_info		 map;
> -	struct resource		*area;
>  	struct platdata_mtd_ram	*pdata;
>  };
>  
> @@ -97,16 +96,6 @@ static int platram_remove(struct platform_device *pdev)
>  
>  	platram_setrw(info, PLATRAM_RO);
>  
> -	/* release resources */
> -
> -	if (info->area) {
> -		release_resource(info->area);
> -		kfree(info->area);
> -	}
> -
> -	if (info->map.virt != NULL)
> -		iounmap(info->map.virt);
> -
>  	kfree(info);
>  
>  	return 0;
> @@ -147,12 +136,11 @@ static int platram_probe(struct platform_device *pdev)
>  	info->pdata = pdata;
>  
>  	/* get the resource for the memory mapping */
> -
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -
> -	if (res == NULL) {
> -		dev_err(&pdev->dev, "no memory resource specified\n");
> -		err = -ENOENT;
> +	info->map.virt = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(info->map.virt)) {
> +		err = PTR_ERR(info->map.virt);
> +		dev_err(&pdev->dev, "failed to ioremap() region\n");
>  		goto exit_free;
>  	}
>  
> @@ -167,26 +155,8 @@ static int platram_probe(struct platform_device *pdev)
>  			(char *)pdata->mapname : (char *)pdev->name;
>  	info->map.bankwidth = pdata->bankwidth;
>  
> -	/* register our usage of the memory area */
> -
> -	info->area = request_mem_region(res->start, info->map.size, pdev->name);
> -	if (info->area == NULL) {
> -		dev_err(&pdev->dev, "failed to request memory region\n");
> -		err = -EIO;
> -		goto exit_free;
> -	}
> -
> -	/* remap the memory area */
> -
> -	info->map.virt = ioremap(res->start, info->map.size);
>  	dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
>  
> -	if (info->map.virt == NULL) {
> -		dev_err(&pdev->dev, "failed to ioremap() region\n");
> -		err = -EIO;
> -		goto exit_free;
> -	}
> -
>  	simple_map_init(&info->map);
>  
>  	dev_dbg(&pdev->dev, "initialised map, probing for mtd\n");