[PATCH] drm/amdgpu: skip amdgpu_device_cache_pci_state under sriov

[Victor Zhao]

Under sriov, host driver will save and restore vf pci cfg space during
reset. And during device init, under sriov, pci_restore_state happens after
fullaccess released, and it can have race condition with mmio protection
enable from host side leading to missing interrupts.

So skip amdgpu_device_cache_pci_state for sriov.

Signed-off-by: Victor Zhao <Victor.Zhao at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 383bbee87df5..64622dc57a6b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -6451,6 +6451,9 @@ bool amdgpu_device_cache_pci_state(struct pci_dev *pdev)
 	struct amdgpu_device *adev = drm_to_adev(dev);
 	int r;
 
+	if (amdgpu_sriov_vf(adev))
+		return false;
+
 	r = pci_save_state(pdev);
 	if (!r) {
 		kfree(adev->pci_state);
-- 
2.34.1