diff options
| author | Perry Yuan <perry.yuan@amd.com> | 2026-01-28 08:54:31 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2026-02-04 00:23:11 +0300 |
| commit | 31b153315b8702d0249aa44d83d9fbf42c5c7a79 (patch) | |
| tree | b10910367ad236b10ba9d67b42652eac19c30e34 | |
| parent | 3cc9398a9ea69b77de01b370463b706c354e52fb (diff) | |
| download | linux-31b153315b8702d0249aa44d83d9fbf42c5c7a79.tar.xz | |
drm/amdgpu: ensure no_hw_access is visible before MMIO
Add a full memory barrier after clearing no_hw_access in
amdgpu_device_mode1_reset() so subsequent PCI state restore
access cannot observe stale state on other CPUs.
Fixes: 7edb503fe4b6 ("drm/amd/pm: Disable MMIO access during SMU Mode 1 reset")
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index c7f44422939f..c1ffc63e23ab 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -5733,6 +5733,9 @@ int amdgpu_device_mode1_reset(struct amdgpu_device *adev) /* enable mmio access after mode 1 reset completed */ adev->no_hw_access = false; + /* ensure no_hw_access is updated before we access hw */ + smp_mb(); + amdgpu_device_load_pci_state(adev->pdev); ret = amdgpu_psp_wait_for_bootloader(adev); if (ret) |