# \[PATCH v2\] video: fbdev: Mark expected switch fall-through

- Subsystems: FRAMEBUFFER LAYER, THE REST
- Maintainers: Helge Deller, Linus Torvalds
- Status: LANDED (cc0c3e39e51b · 2019-08-19 13:52)
- Landed in mainline as cc0c3e39e51b on 2019-08-19.
- List: linux-fbdev
- 2 messages, 2 authors
- Page: https://ratatoskr.run/linux-fbdev/2019/07/5672145/t

## \[PATCH v2\] video: fbdev: Mark expected switch fall-through

- From: Anders Roxell \<hidden\>
- Date: 2019-07-30 15:25:40 
- Message: https://ratatoskr.run/linux-fbdev/2019/07/5672145.md

```text
Now that -Wimplicit-fallthrough is passed to GCC by default, the
following warnings shows up:

../drivers/video/fbdev/sh_mobile_lcdcfb.c: In function ‘sh_mobile_lcdc_channel_fb_init’:
../drivers/video/fbdev/sh_mobile_lcdcfb.c:2086:22: warning: this statement may fall
 through [-Wimplicit-fallthrough=]
   info->fix.ypanstep = 2;
   ~~~~~~~~~~~~~~~~~~~^~~
../drivers/video/fbdev/sh_mobile_lcdcfb.c:2087:2: note: here
  case V4L2_PIX_FMT_NV16:
  ^~~~
../drivers/video/fbdev/sh_mobile_lcdcfb.c: In function ‘sh_mobile_lcdc_overlay_fb_init’:
../drivers/video/fbdev/sh_mobile_lcdcfb.c:1596:22: warning: this statement may fall
 through [-Wimplicit-fallthrough=]
   info->fix.ypanstep = 2;
   ~~~~~~~~~~~~~~~~~~~^~~
../drivers/video/fbdev/sh_mobile_lcdcfb.c:1597:2: note: here
  case V4L2_PIX_FMT_NV16:
  ^~~~

Rework to address a warnings due to the enablement of
-Wimplicit-fallthrough.

Signed-off-by: Anders Roxell <redacted>
---
 drivers/video/fbdev/sh_mobile_lcdcfb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c b/drivers/video/fbdev/sh_mobile_lcdcfb.c
index ac0bcac9a865..c249763dbf0b 100644
--- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
+++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
@@ -1594,6 +1594,7 @@ sh_mobile_lcdc_overlay_fb_init(struct sh_mobile_lcdc_overlay *ovl)
 	case V4L2_PIX_FMT_NV12:
 	case V4L2_PIX_FMT_NV21:
 		info->fix.ypanstep = 2;
+		/* Fall through */
 	case V4L2_PIX_FMT_NV16:
 	case V4L2_PIX_FMT_NV61:
 		info->fix.xpanstep = 2;
@@ -2084,6 +2085,7 @@ sh_mobile_lcdc_channel_fb_init(struct sh_mobile_lcdc_chan *ch,
 	case V4L2_PIX_FMT_NV12:
 	case V4L2_PIX_FMT_NV21:
 		info->fix.ypanstep = 2;
+		/* Fall through */
 	case V4L2_PIX_FMT_NV16:
 	case V4L2_PIX_FMT_NV61:
 		info->fix.xpanstep = 2;
-- 
2.20.1
```

## Re: \[PATCH v2\] video: fbdev: Mark expected switch fall-through

- From: Bartlomiej Zolnierkiewicz \<hidden\>
- Date: 2019-08-19 14:04:11 
- Message: https://ratatoskr.run/linux-fbdev/2019/08/5691716.md

```text

On 7/30/19 5:25 PM, Anders Roxell wrote:
> Now that -Wimplicit-fallthrough is passed to GCC by default, the
> following warnings shows up:
> 
> ../drivers/video/fbdev/sh_mobile_lcdcfb.c: In function ‘sh_mobile_lcdc_channel_fb_init’:
> ../drivers/video/fbdev/sh_mobile_lcdcfb.c:2086:22: warning: this statement may fall
>  through [-Wimplicit-fallthrough=]
>    info->fix.ypanstep = 2;
>    ~~~~~~~~~~~~~~~~~~~^~~
> ../drivers/video/fbdev/sh_mobile_lcdcfb.c:2087:2: note: here
>   case V4L2_PIX_FMT_NV16:
>   ^~~~
> ../drivers/video/fbdev/sh_mobile_lcdcfb.c: In function ‘sh_mobile_lcdc_overlay_fb_init’:
> ../drivers/video/fbdev/sh_mobile_lcdcfb.c:1596:22: warning: this statement may fall
>  through [-Wimplicit-fallthrough=]
>    info->fix.ypanstep = 2;
>    ~~~~~~~~~~~~~~~~~~~^~~
> ../drivers/video/fbdev/sh_mobile_lcdcfb.c:1597:2: note: here
>   case V4L2_PIX_FMT_NV16:
>   ^~~~
> 
> Rework to address a warnings due to the enablement of
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Anders Roxell <redacted>

Patch queued for v5.4, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
```