From: Tom Rix trix@redhat.com
[ Upstream commit d583e752732421b26fef0d65020565f3bef12248 ]
Clang static analysis reports this issue anx7625.c:876:13: warning: The left operand of '&' is a garbage value if (!(bcap & 0xOA01)) { ~~~~ ^
bcap is only set by a successful call to anx7625_aux_trans(). So check.
Fixes: cd1637c7e480 ("drm/bridge: anx7625: add HDCP support") Signed-off-by: Tom Rix trix@redhat.com Fixes: adca62ec370c ("drm/bridge: anx7625: Support reading edid through aux channel") Signed-off-by: Robert Foss robert.foss@linaro.org Link: https://patchwork.freedesktop.org/patch/msgid/20220303201943.501746-1-trix@r... Reviewed-by: Robert Foss robert.foss@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/bridge/analogix/anx7625.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index 31ecf5626f1d..8e1851a57638 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -874,7 +874,10 @@ static int anx7625_hdcp_enable(struct anx7625_data *ctx) }
/* Read downstream capability */ - anx7625_aux_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap); + ret = anx7625_aux_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap); + if (ret < 0) + return ret; + if (!(bcap & 0x01)) { pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap); return 0;