linux-kernel - [PATCH] drm/radeon: fix uninitialized bool variable

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Date:   Sat, 18 Sep 2021 17:41:57 +0800
From:   Zhiwei Yang <yangzhiwei@...ontech.com>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Alex Deucher <alexander.deucher@....com>
Cc:     Christian König <christian.koenig@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Zhiwei Yang <yangzhiwei@...ontech.com>
Subject: [PATCH] drm/radeon: fix uninitialized bool variable

The bool variable detected_hpd_without_ddc in struct radeon_connector
is uninitialized when first used, that may cause unnecessary ddc ops.
Make it as false when a new connector is alloced.

Signed-off-by: Zhiwei Yang <yangzhiwei@...ontech.com>
---
 drivers/gpu/drm/radeon/radeon_connectors.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index fe12d9d91d7a..c1987a66373f 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -1866,6 +1866,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 	bool shared_ddc = false;
 	bool is_dp_bridge = false;
 	bool has_aux = false;
+	bool detected_hpd_without_ddc = false;
 
 	if (connector_type == DRM_MODE_CONNECTOR_Unknown)
 		return;
@@ -1923,6 +1924,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 	radeon_connector->shared_ddc = shared_ddc;
 	radeon_connector->connector_object_id = connector_object_id;
 	radeon_connector->hpd = *hpd;
+	radeon_connector->detected_hpd_without_ddc = detected_hpd_without_ddc;
 
 	radeon_connector->router = *router;
 	if (router->ddc_valid || router->cd_valid) {
@@ -2384,6 +2386,7 @@ radeon_add_legacy_connector(struct drm_device *dev,
 	struct radeon_connector *radeon_connector;
 	struct i2c_adapter *ddc = NULL;
 	uint32_t subpixel_order = SubPixelNone;
+	bool detected_hpd_without_ddc = false;
 
 	if (connector_type == DRM_MODE_CONNECTOR_Unknown)
 		return;
@@ -2414,6 +2417,7 @@ radeon_add_legacy_connector(struct drm_device *dev,
 	radeon_connector->devices = supported_device;
 	radeon_connector->connector_object_id = connector_object_id;
 	radeon_connector->hpd = *hpd;
+	radeon_connector->detected_hpd_without_ddc = detected_hpd_without_ddc;
 
 	switch (connector_type) {
 	case DRM_MODE_CONNECTOR_VGA:
-- 
2.20.1