linux-kernel - [PATCH 5.9 035/152] drm/amdgpu: fix a page fault

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Message-Id: <20201201084716.457544855@linuxfoundation.org>
Date:   Tue,  1 Dec 2020 09:52:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sonny Jiang <sonny.jiang@....com>,
        Leo Liu <leo.liu@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.9 035/152] drm/amdgpu: fix a page fault

From: Sonny Jiang <sonny.jiang@....com>

commit dbbf2728d50343b7947001a81f4c8cc98e4b44e5 upstream.

The UVD firmware is copied to cpu addr in uvd_resume, so it
should be used after that. This is to fix a bug introduced by
patch drm/amdgpu: fix SI UVD firmware validate resume fail.

Signed-off-by: Sonny Jiang <sonny.jiang@....com>
Reviewed-by: Leo Liu <leo.liu@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
CC: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/uvd_v3_1.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/uvd_v3_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/uvd_v3_1.c
@@ -555,13 +555,6 @@ static int uvd_v3_1_sw_init(void *handle
 	if (r)
 		return r;
 
-	/* Retrieval firmware validate key */
-	ptr = adev->uvd.inst[0].cpu_addr;
-	ptr += 192 + 16;
-	memcpy(&ucode_len, ptr, 4);
-	ptr += ucode_len;
-	memcpy(&adev->uvd.keyselect, ptr, 4);
-
 	ring = &adev->uvd.inst->ring;
 	sprintf(ring->name, "uvd");
 	r = amdgpu_ring_init(adev, ring, 512, &adev->uvd.inst->irq, 0,
@@ -573,6 +566,13 @@ static int uvd_v3_1_sw_init(void *handle
 	if (r)
 		return r;
 
+	/* Retrieval firmware validate key */
+	ptr = adev->uvd.inst[0].cpu_addr;
+	ptr += 192 + 16;
+	memcpy(&ucode_len, ptr, 4);
+	ptr += ucode_len;
+	memcpy(&adev->uvd.keyselect, ptr, 4);
+
 	r = amdgpu_uvd_entity_init(adev);
 
 	return r;