drm/amdkfd: Cleanup kfd_process if init_cwsr_apu fails

If init_cwsr_apu fails, we currently leave the kfd_process structure in
place anyway. The next kfd_open will then succeed, using the existing
kfd_process structure. Fix that by cleaning up the kfd_process after a
failure in init_cwsr_apu.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Philip Yang <philip.yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -775,10 +775,8 @@ struct kfd_process *kfd_create_process(struct file *filep)
 			goto out;
 
 		ret = kfd_process_init_cwsr_apu(process, filep);
-		if (ret) {
-			process = ERR_PTR(ret);
-			goto out;
-		}
+		if (ret)
+			goto out_destroy;
 
 		if (!procfs.kobj)
 			goto out;
@@ -826,6 +824,14 @@ struct kfd_process *kfd_create_process(struct file *filep)
 	mutex_unlock(&kfd_processes_mutex);
 
 	return process;
+
+out_destroy:
+	hash_del_rcu(&process->kfd_processes);
+	mutex_unlock(&kfd_processes_mutex);
+	synchronize_srcu(&kfd_processes_srcu);
+	/* kfd_process_free_notifier will trigger the cleanup */
+	mmu_notifier_put(&process->mmu_notifier);
+	return ERR_PTR(ret);
 }
 
 struct kfd_process *kfd_get_process(const struct task_struct *thread)