From 049824125f545c0af3027552e831dc13ff308325 Mon Sep 17 00:00:00 2001 From: Guchun Chen Date: Thu, 16 Apr 2020 23:41:07 +0800 Subject: [PATCH] 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 Reviewed-by: John Clements Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c index 73ae913aee26e..68b82f7b0b800 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c @@ -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; } -- 2.39.5