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Date:   Sun, 1 Nov 2020 17:02:47 +0100
From:   Guido =?iso-8859-1?Q?G=FCnther?= <guido.gunther@puri.sm>
To:     Deepak R Varma <mh12gx2825@gmail.com>
Cc:     outreachy-kernel@googlegroups.com,
        Purism Kernel Team <kernel@puri.sm>,
        Ondrej Jirman <megous@megous.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        melissa.srw@gmail.com, daniel.vetter@ffwll.ch
Subject: Re: [PATCH] drm/panel: st7703: use DEFINE_DEBUGFS_ATTRIBUTE with
 debugfs_create_file_unsafe()
Message-ID: <20201101160247.GA3193@bogon.m.sigxcpu.org>
References: <20201030033150.GA275009@my--box>
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Hi,
On Fri, Oct 30, 2020 at 09:01:50AM +0530, Deepak R Varma wrote:
> Using DEFINE_DEBUGFS_ATTRIBUTE macro with debugfs_create_file_unsafe()
> function in place of the debugfs_create_file() function will make the
> file operation struct "reset" aware of the file's lifetime. Additional
> details here: https://lists.archive.carbon60.com/linux/kernel/2369498
> 
> Issue reported by Coccinelle script:
> scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci
> 
> Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>

Reviewed-by: Guido G?nther <agx@sigxcpu.org>

Cheers,
 -- Guido

> ---
> Please Note: This is a Outreachy project task patch.
> 
>  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> index c22e7c49e077..89b71d4f810d 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> @@ -502,15 +502,14 @@ static int allpixelson_set(void *data, u64 val)
>  	return 0;
>  }
>  
> -DEFINE_SIMPLE_ATTRIBUTE(allpixelson_fops, NULL,
> -			allpixelson_set, "%llu\n");
> +DEFINE_DEBUGFS_ATTRIBUTE(allpixelson_fops, NULL, allpixelson_set, "%llu\n");
>  
>  static void st7703_debugfs_init(struct st7703 *ctx)
>  {
>  	ctx->debugfs = debugfs_create_dir(DRV_NAME, NULL);
>  
> -	debugfs_create_file("allpixelson", 0600, ctx->debugfs, ctx,
> -			    &allpixelson_fops);
> +	debugfs_create_file_unsafe("allpixelson", 0600, ctx->debugfs, ctx,
> +				   &allpixelson_fops);
>  }
>  
>  static void st7703_debugfs_remove(struct st7703 *ctx)
> -- 
> 2.25.1
>