linux-kernel - Re: [PATCH] video: fbdev: omapfb_main: Mark expected switch fall-throughs

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Date:   Fri, 2 Aug 2019 19:12:22 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-fbdev@...r.kernel.org, linux-omap@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video: fbdev: omapfb_main: Mark expected switch
 fall-throughs

On Fri, Aug 02, 2019 at 02:15:42PM -0500, Gustavo A. R. Silva wrote:
> Mark switch cases where we are expecting to fall through.
> 
> This patch fixes the following warning (Building: omap1_defconfig arm):
> 
> drivers/video/fbdev/omap/omapfb_main.c:449:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> drivers/video/fbdev/omap/omapfb_main.c:1549:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
> drivers/video/fbdev/omap/omapfb_main.c:1547:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
> drivers/video/fbdev/omap/omapfb_main.c:1545:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
> drivers/video/fbdev/omap/omapfb_main.c:1543:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
> drivers/video/fbdev/omap/omapfb_main.c:1540:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
> drivers/video/fbdev/omap/omapfb_main.c:1538:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
> drivers/video/fbdev/omap/omapfb_main.c:1535:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  drivers/video/fbdev/omap/omapfb_main.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/video/fbdev/omap/omapfb_main.c b/drivers/video/fbdev/omap/omapfb_main.c
> index 90eca64e3144..702cca59bda1 100644
> --- a/drivers/video/fbdev/omap/omapfb_main.c
> +++ b/drivers/video/fbdev/omap/omapfb_main.c
> @@ -447,6 +447,7 @@ static int set_color_mode(struct omapfb_plane_struct *plane,
>  		return 0;
>  	case 12:
>  		var->bits_per_pixel = 16;
> +		/* fall through */
>  	case 16:
>  		if (plane->fbdev->panel->bpp == 12)
>  			plane->color_mode = OMAPFB_COLOR_RGB444;
> @@ -1534,20 +1535,27 @@ static void omapfb_free_resources(struct omapfb_device *fbdev, int state)
>  	case OMAPFB_ACTIVE:
>  		for (i = 0; i < fbdev->mem_desc.region_cnt; i++)
>  			unregister_framebuffer(fbdev->fb_info[i]);
> +		/* fall through */
>  	case 7:
>  		omapfb_unregister_sysfs(fbdev);
> +		/* fall through */
>  	case 6:
>  		if (fbdev->panel->disable)
>  			fbdev->panel->disable(fbdev->panel);
> +		/* fall through */
>  	case 5:
>  		omapfb_set_update_mode(fbdev, OMAPFB_UPDATE_DISABLED);
> +		/* fall through */
>  	case 4:
>  		planes_cleanup(fbdev);
> +		/* fall through */
>  	case 3:
>  		ctrl_cleanup(fbdev);
> +		/* fall through */
>  	case 2:
>  		if (fbdev->panel->cleanup)
>  			fbdev->panel->cleanup(fbdev->panel);
> +		/* fall through */
>  	case 1:
>  		dev_set_drvdata(fbdev->dev, NULL);
>  		kfree(fbdev);
> -- 
> 2.22.0
> 

-- 
Kees Cook