linux-kernel - Re: [PATCH v2] mtd: nand: nandsim: fix error check

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Date:   Sat, 19 Nov 2016 19:35:09 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:     Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v2] mtd: nand: nandsim: fix error check

On Wed, 16 Nov 2016 08:02:55 +0000
Sudip Mukherjee <sudipm.mukherjee@...il.com> wrote:

> debugfs_create_dir() and debugfs_create_file() returns NULL on error or
> a pointer on success. They do not return the error value with ERR_PTR.
> So we should not check the return with IS_ERR_OR_NULL, instead we
> should just check for NULL.
> 
> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>

Applied.

Thanks,

Boris

> ---
> 
> v2: nuked err
> 
>  drivers/mtd/nand/nandsim.c | 15 +++++----------
>  1 file changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
> index c76287a..c847426 100644
> --- a/drivers/mtd/nand/nandsim.c
> +++ b/drivers/mtd/nand/nandsim.c
> @@ -525,24 +525,20 @@ static int nandsim_debugfs_create(struct nandsim *dev)
>  {
>  	struct nandsim_debug_info *dbg = &dev->dbg;
>  	struct dentry *dent;
> -	int err;
>  
>  	if (!IS_ENABLED(CONFIG_DEBUG_FS))
>  		return 0;
>  
>  	dent = debugfs_create_dir("nandsim", NULL);
> -	if (IS_ERR_OR_NULL(dent)) {
> -		int err = dent ? -ENODEV : PTR_ERR(dent);
> -
> -		NS_ERR("cannot create \"nandsim\" debugfs directory, err %d\n",
> -			err);
> -		return err;
> +	if (!dent) {
> +		NS_ERR("cannot create \"nandsim\" debugfs directory\n");
> +		return -ENODEV;
>  	}
>  	dbg->dfs_root = dent;
>  
>  	dent = debugfs_create_file("wear_report", S_IRUSR,
>  				   dbg->dfs_root, dev, &dfs_fops);
> -	if (IS_ERR_OR_NULL(dent))
> +	if (!dent)
>  		goto out_remove;
>  	dbg->dfs_wear_report = dent;
>  
> @@ -550,8 +546,7 @@ static int nandsim_debugfs_create(struct nandsim *dev)
>  
>  out_remove:
>  	debugfs_remove_recursive(dbg->dfs_root);
> -	err = dent ? PTR_ERR(dent) : -ENODEV;
> -	return err;
> +	return -ENODEV;
>  }
>  
>  /**