5.15-stable review patch. If anyone has any objections, please let me know.
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From: Tomi Valkeinen tomi.valkeinen@ideasonboard.com
[ Upstream commit a2d9036615f0adfa5b0a46bb2ce42ef1d9a04fbe ]
smatch reports:
drivers/gpu/drm/bridge/tc358768.c:223 tc358768_update_bits() error: uninitialized symbol 'orig'.
Fix this by bailing out from tc358768_update_bits() if the tc358768_read() produces an error.
Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver") Reviewed-by: Peter Ujfalusi peter.ujfalusi@gmail.com Tested-by: Maxim Schwalm maxim.schwalm@gmail.com # Asus TF700T Tested-by: Marcel Ziswiler marcel.ziswiler@toradex.com Signed-off-by: Tomi Valkeinen tomi.valkeinen@ideasonboard.com Signed-off-by: Robert Foss rfoss@kernel.org Link: https://patchwork.freedesktop.org/patch/msgid/20230906-tc358768-v4-2-31725f0... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/bridge/tc358768.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c index 8b1bdffc5005d..da37dfd81a6fb 100644 --- a/drivers/gpu/drm/bridge/tc358768.c +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -217,6 +217,10 @@ static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask, u32 tmp, orig;
tc358768_read(priv, reg, &orig); + + if (priv->error) + return; + tmp = orig & ~mask; tmp |= val & mask; if (tmp != orig)