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Subject[PATCH AUTOSEL 5.11 36/67] drm/amd/amdgpu: add error handling to amdgpu_virt_read_pf2vf_data
Date
From: Jingwen Chen <Jingwen.Chen2@amd.com>

[ Upstream commit 64dcf2f01d59cf9fad19b1a387bd39736a8f4d69 ]

[Why]
when vram lost happened in guest, try to write vram can lead to
kernel stuck.

[How]
When the readback data is invalid, don't do write work, directly
reschedule a new work.

Signed-off-by: Jingwen Chen <Jingwen.Chen2@amd.com>
Reviewed-by: Monk Liu<monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index 2d51b7694d1fd..572153d08ad11 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -560,10 +560,14 @@ static int amdgpu_virt_write_vf2pf_data(struct amdgpu_device *adev)
static void amdgpu_virt_update_vf2pf_work_item(struct work_struct *work)
{
struct amdgpu_device *adev = container_of(work, struct amdgpu_device, virt.vf2pf_work.work);
+ int ret;

- amdgpu_virt_read_pf2vf_data(adev);
+ ret = amdgpu_virt_read_pf2vf_data(adev);
+ if (ret)
+ goto out;
amdgpu_virt_write_vf2pf_data(adev);

+out:
schedule_delayed_work(&(adev->virt.vf2pf_work), adev->virt.vf2pf_update_interval_ms);
}

--
2.27.0
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