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drm/bridge: sil_sii8620: initialize return of sii8620_readb 

[ Upstream commit 02cd2d3144 ]

clang static analysis flags this error

sil-sii8620.c:184:2: warning: Undefined or garbage value
  returned to caller [core.uninitialized.UndefReturn]
        return ret;
        ^~~~~~~~~~

sii8620_readb calls sii8620_read_buf.
sii8620_read_buf can return without setting its output
pararmeter 'ret'.

So initialize ret.

Fixes: ce6e153f41 ("drm/bridge: add Silicon Image SiI8620 driver")
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200712152453.27510-1-trix@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Tom Rix 2020-07-12 08:24:53 -07:00 committed by Greg Kroah-Hartman
parent 8ffa0cf2b6
commit 6a292c4bc0
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/bridge/sil-sii8620.c
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@ -177,7 +177,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
static u8 sii8620_readb(struct sii8620 *ctx, u16 addr)
{
u8 ret;
u8 ret = 0;
sii8620_read_buf(ctx, addr, &ret, 1);
return ret;