linux-kernel - [PATCH 1/2] drm: sun4i: sun6i_mipi_dsi: Mark expected switch fall-through

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Date:   Fri, 26 Jul 2019 13:28:02 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     airlied@...ux.ie, daniel@...ll.ch, wens@...e.org
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH 1/2] drm: sun4i: sun6i_mipi_dsi: Mark expected switch fall-through

When fall-through warnings was enabled by default the following warning
was starting to show up:

../drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c: In function
‘sun6i_dsi_transfer’:../drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c:992:6: warning:
 this statement may fall through [-Wimplicit-fallthrough=]
   if (msg->rx_len == 1) {
      ^
../drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c:997:2: note: here
  default:
  ^~~~~~~

Rework so that the compiler doesn't warn about fall-through. Change
the if-statement so that we can move out 'break;' one level.

Fixes: d93512ef0f0e ("Makefile: Globally enable fall-through warning")
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 472f73985deb..40ed21e527f9 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -992,8 +992,10 @@ static ssize_t sun6i_dsi_transfer(struct mipi_dsi_host *host,
 	case MIPI_DSI_DCS_READ:
 		if (msg->rx_len == 1) {
 			ret = sun6i_dsi_dcs_read(dsi, msg);
-			break;
+		} else {
+			ret = -EINVAL;
 		}
+		break;
 
 	default:
 		ret = -EINVAL;
-- 
2.20.1