linux-kernel - [PATCH] drm: mali-dp: Mark expected switch fall-through

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Date:   Fri, 26 Jul 2019 13:27:41 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     airlied@...ux.ie, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH] drm: mali-dp: Mark expected switch fall-through

When fall-through warnings was enabled by default, commit d93512ef0f0e
("Makefile: Globally enable fall-through warning"), the following
warnings was starting to show up:

../drivers/gpu/drm/arm/malidp_hw.c: In function ‘malidp_format_get_bpp’:
../drivers/gpu/drm/arm/malidp_hw.c:387:8: warning: this statement may fall
 through [-Wimplicit-fallthrough=]
    bpp = 30;
    ~~~~^~~~
../drivers/gpu/drm/arm/malidp_hw.c:388:3: note: here
   case DRM_FORMAT_YUV420_10BIT:
   ^~~~
../drivers/gpu/drm/arm/malidp_hw.c: In function ‘malidp_se_irq’:
../drivers/gpu/drm/arm/malidp_hw.c:1311:4: warning: this statement may fall
 through [-Wimplicit-fallthrough=]
    drm_writeback_signal_completion(&malidp->mw_connector, 0);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/gpu/drm/arm/malidp_hw.c:1313:3: note: here
   case MW_START:
   ^~~~

Rework to add a 'break;' in a case that didn't have it so that
the compiler doesn't warn about fall-through.

Cc: stable@...r.kernel.org # v4.9+
Fixes: b8207562abdd ("drm/arm/malidp: Specified the rotation memory requirements for AFBC YUV formats")
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---
 drivers/gpu/drm/arm/malidp_hw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
index 50af399d7f6f..dc5fff9af338 100644
--- a/drivers/gpu/drm/arm/malidp_hw.c
+++ b/drivers/gpu/drm/arm/malidp_hw.c
@@ -385,6 +385,7 @@ int malidp_format_get_bpp(u32 fmt)
 		switch (fmt) {
 		case DRM_FORMAT_VUY101010:
 			bpp = 30;
+			break;
 		case DRM_FORMAT_YUV420_10BIT:
 			bpp = 15;
 			break;
@@ -1309,7 +1310,7 @@ static irqreturn_t malidp_se_irq(int irq, void *arg)
 			break;
 		case MW_RESTART:
 			drm_writeback_signal_completion(&malidp->mw_connector, 0);
-			/* fall through to a new start */
+			/* fall through */
 		case MW_START:
 			/* writeback started, need to emulate one-shot mode */
 			hw->disable_memwrite(hwdev);
-- 
2.20.1