From e966e2d0574311025838bd2da0ce38b8595aa265 Mon Sep 17 00:00:00 2001
From: Surbhi Kakarya <surbhi.kakarya@amd.com>
Date: Fri, 17 Dec 2021 12:01:09 -0500
Subject: drm/amdgpu: Check the memory can be accesssed by
ttm_device_clear_dma_mappings.
Git-commit: b6fd6e0f5eb8c6d10575d08a2c6df8ed83877e07
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
If the event guard is enabled and VF doesn't receive an ack from PF for full access,
the guest driver load crashes.
This is caused due to the call to ttm_device_clear_dma_mappings with non-initialized
mman during driver tear down.
This patch adds the necessary condition to check if the mman initialization passed or not
and takes the path based on the condition output.
Signed-off-by: Surbhi Kakarya <Surbhi.Kakarya@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 05a1b7044c37..c2a16b20de9a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3901,7 +3901,8 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev)
amdgpu_irq_fini_hw(adev);
- ttm_device_clear_dma_mappings(&adev->mman.bdev);
+ if (adev->mman.initialized)
+ ttm_device_clear_dma_mappings(&adev->mman.bdev);
amdgpu_gart_dummy_page_fini(adev);
--
2.38.1