drm/amdgpu: fix crash in acp_hw_fini

On CZ/ST systems with AZ rather than ACP audio, we need to bail
early in hw_fini since there is nothing to do.

bug: https://bugs.freedesktop.org/show_bug.cgi?id=98276

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
index 892d60fb225b..2057683f7b59 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
@@ -395,9 +395,12 @@ static int acp_hw_fini(void *handle)
 {
         int i, ret;
         struct device *dev;
-
         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
+        /* return early if no ACP */
+        if (!adev->acp.acp_genpd)
+                return 0;
+
         for (i = 0; i < ACP_DEVS ; i++) {
                 dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);
                 ret = pm_genpd_remove_device(&adev->acp.acp_genpd->gpd, dev);