linux-kernel - [PATCH] drm/nouveau/disp: Revert a NULL check inside nouveau_connector_get

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Message-ID: <20230805101813.2603989-1-kherbst@redhat.com>
Date:   Sat,  5 Aug 2023 12:18:13 +0200
From:   Karol Herbst <kherbst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Ben Skeggs <bskeggs@...hat.com>, Lyude Paul <lyude@...hat.com>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        Karol Herbst <kherbst@...hat.com>,
        Olaf Skibbe <news@...vcenko.com>
Subject: [PATCH] drm/nouveau/disp: Revert a NULL check inside nouveau_connector_get_modes

The original commit adding that check tried to protect the kenrel against
a potential invalid NULL pointer access.

However we call nouveau_connector_detect_depth once without a native_mode
set on purpose for non LVDS connectors and this broke DP support in a few
cases.

Cc: Olaf Skibbe <news@...vcenko.com>
Cc: Lyude Paul <lyude@...hat.com>
Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/238
Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/245
Fixes: 20a2ce87fbaf8 ("drm/nouveau/dp: check for NULL nv_connector->native_mode")
Signed-off-by: Karol Herbst <kherbst@...hat.com>
---
 drivers/gpu/drm/nouveau/nouveau_connector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index f75c6f09dd2af..a2e0033e8a260 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -967,7 +967,7 @@ nouveau_connector_get_modes(struct drm_connector *connector)
 	/* Determine display colour depth for everything except LVDS now,
 	 * DP requires this before mode_valid() is called.
 	 */
-	if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS && nv_connector->native_mode)
+	if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS)
 		nouveau_connector_detect_depth(connector);
 
 	/* Find the native mode if this is a digital panel, if we didn't
-- 
2.41.0