[PATCH] drm/amdgpu: ensure device_list is initialised before calling list_add_tail

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

Currently the call to list_add_tail will access an the uninitalised
device_list.prev. Fix this by ensuring device_list is initialized before
adding items to it.

Addresses-Coverity: ("Uninitialized pointer read")
Fixes: b3dbd6d3ec49 ("drm/amdgpu: resolve mGPU RAS query instability")
Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index b0aa4e1ed4df..caa4969bd46f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -1447,6 +1447,7 @@ static void amdgpu_ras_do_recovery(struct work_struct *work)
 	if  (hive && adev->gmc.xgmi.num_physical_nodes > 1) {
 		device_list_handle = &hive->device_list;
 	} else {
+		INIT_LIST_HEAD(&device_list);
 		list_add_tail(&adev->gmc.xgmi.head, &device_list);
 		device_list_handle = &device_list;
 	}
-- 
2.25.1