drm/amdkfd: drop process ref count when xnack disable

During svm restore pages interrupt handler, kfd_process ref count was
never dropped when xnack was disabled. Therefore, the object was never
released.

Fixes: 2383f56 ("drm/amdkfd: page table restore through svm API")
Signed-off-by: Alex Sierra <[email protected]>
Reviewed-by: Philip Yang <[email protected]>
Reviewed-by: Jonathan Kim <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Cc: [email protected]

Author: alexsierrag

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

@@ -2484,7 +2484,8 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
 	}
 	if (!p->xnack_enabled) {
 		pr_debug("XNACK not enabled for pasid 0x%x\n", pasid);
-		return -EFAULT;
+		r = -EFAULT;
+		goto out;
 	}
 	svms = &p->svms;