linux-kernel - [PATCH AUTOSEL for 4.9 34/54] drm/amdgpu: fix unload driver issue for virtual display

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Date:   Wed, 22 Nov 2017 22:23:59 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Xiangliang Yu <Xiangliang.Yu@....com>,
        Alex Deucher <alexander.deucher@....com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 34/54] drm/amdgpu: fix unload driver issue for
 virtual display

From: Xiangliang Yu <Xiangliang.Yu@....com>

[ Upstream commit 3a1d19a29670aa7eb58576a31883d0aa9fb77549 ]

Virtual display doesn't allocate amdgpu_encoder when initializing,
so will get invaild pointer if try to free amdgpu_encoder when
unloading driver.

Signed-off-by: Xiangliang Yu <Xiangliang.Yu@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
Acked-by: Christian König <christian.koenig@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/gpu/drm/amd/amdgpu/dce_virtual.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
index c2bd9f045532..6d75fd0e3105 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
@@ -565,11 +565,8 @@ static const struct drm_encoder_helper_funcs dce_virtual_encoder_helper_funcs =
 
 static void dce_virtual_encoder_destroy(struct drm_encoder *encoder)
 {
-	struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
-
-	kfree(amdgpu_encoder->enc_priv);
 	drm_encoder_cleanup(encoder);
-	kfree(amdgpu_encoder);
+	kfree(encoder);
 }
 
 static const struct drm_encoder_funcs dce_virtual_encoder_funcs = {
-- 
2.11.0