linux-kernel - Re: [PATCH] drm/panel: st7703: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file_unsafe()

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Date:   Sun, 1 Nov 2020 10:22:16 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Deepak R Varma <mh12gx2825@...il.com>
Cc:     outreachy-kernel@...glegroups.com,
        Guido Günther <agx@...xcpu.org>,
        Purism Kernel Team <kernel@...i.sm>,
        Ondrej Jirman <megous@...ous.com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        melissa.srw@...il.com, daniel.vetter@...ll.ch
Subject: Re: [PATCH] drm/panel: st7703: use DEFINE_DEBUGFS_ATTRIBUTE with
 debugfs_create_file_unsafe()

Hi Deepak

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@...il.com>

Based on discussions triggered by other patches doing the same
replacement I will ignore this patch for now.
If the conclusions are that this is indeed the right thing to do then
please let us know so we can apply this patch.

Thanks,
	Sam

> ---
> 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
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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