[PATCH] drm/amdgpu: add missed write lock for pci detected state pci_channel_io_normal

[Guchun Chen]

When a PCI error state pci_channel_io_normal is detectd, it will
report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI driver
will continue the execution of PCI resume callback report_resume by
pci_walk_bridge, and the callback will go into amdgpu_pci_resume
finally, where write lock is releasd unconditionally without acquiring
such lock.

Fixes: c9a6b82f45e2("drm/amdgpu: Implement DPC recovery")
Signed-off-by: Guchun Chen <guchun.c...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index bb5ad2b6ca13..12f822d51de2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -5370,6 +5370,7 @@ pci_ers_result_t amdgpu_pci_error_detected(struct pci_dev 
*pdev, pci_channel_sta
 
        switch (state) {
        case pci_channel_io_normal:
+               amdgpu_device_lock_adev(adev, NULL);
                return PCI_ERS_RESULT_CAN_RECOVER;
        /* Fatal error, prepare for slot reset */
        case pci_channel_io_frozen:
-- 
2.17.1