[PATCH 6/8] slimbus: qcom-ngd-ctrl: Initialize controller resources in controller

[srini]

From: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxxxx>

The work structs and work queue are controller resources, create and
destroy them in the controller context. Creating them as part of the
child device's probe path seems to be okay now that the controller's
probe has been updated, but if for some reason the child does not probe
successfully a SSR or PDR notification will schedule_work() on an
uninitialized "ngd_up_work".

Move the initialization of these controller resources to the controller
probe function to avoid any issues, and to clarify the ownership.

Fixes: 917809e2280b ("slimbus: ngd: Add qcom SLIMBus NGD driver")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
Reviewed-by: Mukesh Ojha <mukesh.ojha@xxxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxxxx>
Signed-off-by: Srinivas Kandagatla <srini@xxxxxxxxxx>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 38 ++++++++++++++-------------------
 1 file changed, 16 insertions(+), 22 deletions(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index c1f26b7de519..540a62999655 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1582,25 +1582,8 @@ static int qcom_slim_ngd_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 	pm_runtime_get_noresume(dev);
 	ret = qcom_slim_ngd_qmi_svc_event_init(ctrl);
-	if (ret) {
+	if (ret)
 		dev_err(&pdev->dev, "QMI service registration failed:%d", ret);
-		return ret;
-	}
-
-	INIT_WORK(&ctrl->m_work, qcom_slim_ngd_master_worker);
-	INIT_WORK(&ctrl->ngd_up_work, qcom_slim_ngd_up_worker);
-	ctrl->mwq = create_singlethread_workqueue("ngd_master");
-	if (!ctrl->mwq) {
-		dev_err(&pdev->dev, "Failed to start master worker\n");
-		ret = -ENOMEM;
-		goto wq_err;
-	}
-
-	return 0;
-wq_err:
-	qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi);
-	if (ctrl->mwq)
-		destroy_workqueue(ctrl->mwq);
 
 	return ret;
 }
@@ -1653,9 +1636,18 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 	init_completion(&ctrl->qmi.qmi_comp);
 	init_completion(&ctrl->qmi_up);
 
+	INIT_WORK(&ctrl->m_work, qcom_slim_ngd_master_worker);
+	INIT_WORK(&ctrl->ngd_up_work, qcom_slim_ngd_up_worker);
+
+	ctrl->mwq = create_singlethread_workqueue("ngd_master");
+	if (!ctrl->mwq)
+		return dev_err_probe(dev, -ENOMEM, "Failed to start master worker\n");
+
 	ctrl->pdr = pdr_handle_alloc(slim_pd_status, ctrl);
-	if (IS_ERR(ctrl->pdr))
-		return dev_err_probe(dev, PTR_ERR(ctrl->pdr), "Failed to init PDR handle\n");
+	if (IS_ERR(ctrl->pdr)) {
+		ret = dev_err_probe(dev, PTR_ERR(ctrl->pdr), "Failed to init PDR handle\n");
+		goto err_destroy_mwq;
+	}
 
 	ret = of_qcom_slim_ngd_register(dev, ctrl);
 	if (ret)
@@ -1682,6 +1674,8 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 	qcom_slim_ngd_unregister(ctrl);
 err_pdr_release:
 	pdr_handle_release(ctrl->pdr);
+err_destroy_mwq:
+	destroy_workqueue(ctrl->mwq);
 
 	return ret;
 }
@@ -1694,6 +1688,8 @@ static void qcom_slim_ngd_ctrl_remove(struct platform_device *pdev)
 	qcom_unregister_ssr_notifier(ctrl->notifier, &ctrl->nb);
 
 	qcom_slim_ngd_unregister(ctrl);
+
+	destroy_workqueue(ctrl->mwq);
 }
 
 static void qcom_slim_ngd_remove(struct platform_device *pdev)
@@ -1704,8 +1700,6 @@ static void qcom_slim_ngd_remove(struct platform_device *pdev)
 	qcom_slim_ngd_enable(ctrl, false);
 	qcom_slim_ngd_exit_dma(ctrl);
 	qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi);
-	if (ctrl->mwq)
-		destroy_workqueue(ctrl->mwq);
 
 	kfree(ctrl->ngd);
 	ctrl->ngd = NULL;
-- 
2.53.0