[PATCH v2 1/3] slimbus: qcom-ngd: use correct error in message of pdr_add_lookup() failure

[PATCH v2 1/3] slimbus: qcom-ngd: use correct error in message of pdr_add_lookup() failure

[Krzysztof Kozlowski]

Use correct error code, instead of previous 'ret' value, when printing
error from pdr_add_lookup() failure.

Cc: <stable@vger.kernel.org>
Fixes: e1ae85e1830e ("slimbus: qcom-ngd-ctrl: add Protection Domain Restart Support")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Changes since v1:
1. Correct typo
2. Return 'ret' instead of again PTR_ERR
---
 drivers/slimbus/qcom-ngd-ctrl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 0aa8408464ad..f4f330b9fa72 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1581,8 +1581,9 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 
 	pds = pdr_add_lookup(ctrl->pdr, "avs/audio", "msm/adsp/audio_pd");
 	if (IS_ERR(pds) && PTR_ERR(pds) != -EALREADY) {
+		ret = PTR_ERR(pds);
 		dev_err(dev, "pdr add lookup failed: %d\n", ret);
-		return PTR_ERR(pds);
+		return ret;
 	}
 
 	platform_driver_register(&qcom_slim_ngd_driver);
-- 
2.34.1

[PATCH v2 2/3] slimbus: qcom-ngd: cleanup in probe error path

[Krzysztof Kozlowski]

Add proper error path in probe() to cleanup resources previously
acquired/allocated to fix warnings visible during probe deferral:

  notifier callback qcom_slim_ngd_ssr_notify already registered
  WARNING: CPU: 6 PID: 70 at kernel/notifier.c:28 notifier_chain_register+0x5c/0x90
  Modules linked in:
  CPU: 6 PID: 70 Comm: kworker/u16:1 Not tainted 6.0.0-rc3-next-20220830 #380
  Call trace:
   notifier_chain_register+0x5c/0x90
   srcu_notifier_chain_register+0x44/0x90
   qcom_register_ssr_notifier+0x38/0x4c
   qcom_slim_ngd_ctrl_probe+0xd8/0x400
   platform_probe+0x6c/0xe0
   really_probe+0xbc/0x2d4
   __driver_probe_device+0x78/0xe0
   driver_probe_device+0x3c/0x12c
   __device_attach_driver+0xb8/0x120
   bus_for_each_drv+0x78/0xd0
   __device_attach+0xa8/0x1c0
   device_initial_probe+0x18/0x24
   bus_probe_device+0xa0/0xac
   deferred_probe_work_func+0x88/0xc0
   process_one_work+0x1d4/0x320
   worker_thread+0x2cc/0x44c
   kthread+0x110/0x114
   ret_from_fork+0x10/0x20

Cc: <stable@vger.kernel.org>
Fixes: e1ae85e1830e ("slimbus: qcom-ngd-ctrl: add Protection Domain Restart Support")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Changes since v1:
1. None
---
 drivers/slimbus/qcom-ngd-ctrl.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index f4f330b9fa72..bacc6af1d51e 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1576,18 +1576,27 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 	ctrl->pdr = pdr_handle_alloc(slim_pd_status, ctrl);
 	if (IS_ERR(ctrl->pdr)) {
 		dev_err(dev, "Failed to init PDR handle\n");
-		return PTR_ERR(ctrl->pdr);
+		ret = PTR_ERR(ctrl->pdr);
+		goto err_pdr_alloc;
 	}
 
 	pds = pdr_add_lookup(ctrl->pdr, "avs/audio", "msm/adsp/audio_pd");
 	if (IS_ERR(pds) && PTR_ERR(pds) != -EALREADY) {
 		ret = PTR_ERR(pds);
 		dev_err(dev, "pdr add lookup failed: %d\n", ret);
-		return ret;
+		goto err_pdr_lookup;
 	}
 
 	platform_driver_register(&qcom_slim_ngd_driver);
 	return of_qcom_slim_ngd_register(dev, ctrl);
+
+err_pdr_alloc:
+	qcom_unregister_ssr_notifier(ctrl->notifier, &ctrl->nb);
+
+err_pdr_lookup:
+	pdr_handle_release(ctrl->pdr);
+
+	return ret;
 }
 
 static int qcom_slim_ngd_ctrl_remove(struct platform_device *pdev)
-- 
2.34.1

[PATCH v2 3/3] slimbus: qcom-ngd: simplify error paths with dev_err_probe

[Krzysztof Kozlowski]

Use dev_err_probe to skip printing of deferred probe errors and to
simplify error paths.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Changes since v1:
1. None
---
 drivers/slimbus/qcom-ngd-ctrl.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index bacc6af1d51e..cec11aa106bf 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1543,10 +1543,8 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 
 	ret = devm_request_irq(dev, ret, qcom_slim_ngd_interrupt,
 			       IRQF_TRIGGER_HIGH, "slim-ngd", ctrl);
-	if (ret) {
-		dev_err(&pdev->dev, "request IRQ failed\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret, "request IRQ failed\n");
 
 	ctrl->nb.notifier_call = qcom_slim_ngd_ssr_notify;
 	ctrl->notifier = qcom_register_ssr_notifier("lpass", &ctrl->nb);
@@ -1575,15 +1573,14 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 
 	ctrl->pdr = pdr_handle_alloc(slim_pd_status, ctrl);
 	if (IS_ERR(ctrl->pdr)) {
-		dev_err(dev, "Failed to init PDR handle\n");
-		ret = PTR_ERR(ctrl->pdr);
+		ret = dev_err_probe(dev, PTR_ERR(ctrl->pdr),
+				    "Failed to init PDR handle\n");
 		goto err_pdr_alloc;
 	}
 
 	pds = pdr_add_lookup(ctrl->pdr, "avs/audio", "msm/adsp/audio_pd");
 	if (IS_ERR(pds) && PTR_ERR(pds) != -EALREADY) {
-		ret = PTR_ERR(pds);
-		dev_err(dev, "pdr add lookup failed: %d\n", ret);
+		ret = dev_err_probe(dev, PTR_ERR(pds), "pdr add lookup failed\n");
 		goto err_pdr_lookup;
 	}
 
-- 
2.34.1

Re: [PATCH v2 1/3] slimbus: qcom-ngd: use correct error in message of pdr_add_lookup() failure

[Srinivas Kandagatla]

On 30/08/2022 18:52, Krzysztof Kozlowski wrote:
> Use correct error code, instead of previous 'ret' value, when printing
> error from pdr_add_lookup() failure.
> 
> Cc: <stable@vger.kernel.org>
> Fixes: e1ae85e1830e ("slimbus: qcom-ngd-ctrl: add Protection Domain Restart Support")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> 
> ---
> 
Applied all thanks,

--srini
> Changes since v1:
> 1. Correct typo
> 2. Return 'ret' instead of again PTR_ERR
> ---
>   drivers/slimbus/qcom-ngd-ctrl.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
> index 0aa8408464ad..f4f330b9fa72 100644
> --- a/drivers/slimbus/qcom-ngd-ctrl.c
> +++ b/drivers/slimbus/qcom-ngd-ctrl.c
> @@ -1581,8 +1581,9 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
>   
>   	pds = pdr_add_lookup(ctrl->pdr, "avs/audio", "msm/adsp/audio_pd");
>   	if (IS_ERR(pds) && PTR_ERR(pds) != -EALREADY) {
> +		ret = PTR_ERR(pds);
>   		dev_err(dev, "pdr add lookup failed: %d\n", ret);
> -		return PTR_ERR(pds);
> +		return ret;
>   	}
>   
>   	platform_driver_register(&qcom_slim_ngd_driver);