linux-kernel - [PATCH AUTOSEL 4.9 001/251] drm/sti: do not remove the drm

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Message-Id: <20200116173445.21385-1-sashal@kernel.org>
Date:   Thu, 16 Jan 2020 12:30:35 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Peter Rosin <peda@...ntia.se>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 4.9 001/251] drm/sti: do not remove the drm_bridge that was never added

From: Peter Rosin <peda@...ntia.se>

[ Upstream commit 66e31a72dc38543b2d9d1ce267dc78ba9beebcfd ]

Removing the drm_bridge_remove call should avoid a NULL dereference
during list processing in drm_bridge_remove if the error path is ever
taken.

The more natural approach would perhaps be to add a drm_bridge_add,
but there are several other bridges that never call drm_bridge_add.
Just removing the drm_bridge_remove is the easier fix.

Fixes: 84601dbdea36 ("drm: sti: rework init sequence")
Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Peter Rosin <peda@...ntia.se>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180806061910.29914-2-peda@axentia.se
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/sti/sti_hda.c  | 1 -
 drivers/gpu/drm/sti/sti_hdmi.c | 1 -
 2 files changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/sti/sti_hda.c b/drivers/gpu/drm/sti/sti_hda.c
index e7c243f70870..08808e3701de 100644
--- a/drivers/gpu/drm/sti/sti_hda.c
+++ b/drivers/gpu/drm/sti/sti_hda.c
@@ -740,7 +740,6 @@ static int sti_hda_bind(struct device *dev, struct device *master, void *data)
 	return 0;
 
 err_sysfs:
-	drm_bridge_remove(bridge);
 	return -EINVAL;
 }
 
diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index 376b0763c874..a5412a6fbeca 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -1352,7 +1352,6 @@ static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
 	return 0;
 
 err_sysfs:
-	drm_bridge_remove(bridge);
 	hdmi->drm_connector = NULL;
 	return -EINVAL;
 }
-- 
2.20.1