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drm/amdgpu: fix kernel page fault issue by ras recovery on sGPU 

When running ras uncorrectable error injection and triggering GPU
reset on sGPU, below issue is observed. It's caused by the list
uninitialized when accessing.

[   80.047227] BUG: unable to handle page fault for address: ffffffffc0f4f750
[   80.047300] #PF: supervisor write access in kernel mode
[   80.047351] #PF: error_code(0x0003) - permissions violation
[   80.047404] PGD 12c20e067 P4D 12c20e067 PUD 12c210067 PMD 41c4ee067 PTE 404316061
[   80.047477] Oops: 0003 [#1] SMP PTI
[   80.047516] CPU: 7 PID: 377 Comm: kworker/7:2 Tainted: G           OE     5.4.0-rc7-guchchen #1
[   80.047594] Hardware name: System manufacturer System Product Name/TUF Z370-PLUS GAMING II, BIOS 0411 09/21/2018
[   80.047888] Workqueue: events amdgpu_ras_do_recovery [amdgpu]

Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: John Clements <John.Clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Guchun Chen 2020-04-16 23:41:07 +08:00 committed by Alex Deucher
parent 69d0c18dda
commit 12c17b9d62
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
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@ -1453,9 +1453,10 @@ static void amdgpu_ras_do_recovery(struct work_struct *work)
struct amdgpu_hive_info *hive = amdgpu_get_xgmi_hive(adev, false);
/* Build list of devices to query RAS related errors */
if (hive && adev->gmc.xgmi.num_physical_nodes > 1) {
if (hive && adev->gmc.xgmi.num_physical_nodes > 1)
device_list_handle = &hive->device_list;
} else {
else {
INIT_LIST_HEAD(&device_list);
list_add_tail(&adev->gmc.xgmi.head, &device_list);
device_list_handle = &device_list;
}