[PATCH 0/3] staging: greybus: arche-platform: fix probe issues

[PATCH 0/3] staging: greybus: arche-platform: fix probe issues

[Johan Hovold]

This series fixes some issues with the arche platform drivers probe
function.

A fix for the first issue was sent to the list two months ago, but there
has been no reply to the review feedback given then.

Non of these are tagged for stable backport as very few people should
have the hardware in question and be bothered by this.

Johan


Johan Hovold (3):
  staging: greybus: arche-platform: fix coldboot probe error path
  staging: greybus: arche-platform: fix memleak on probe failure
  staging: greybus: arche-platform: fix OF populate on driver rebind

 drivers/staging/greybus/arche-platform.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

-- 
2.51.2

[PATCH 1/3] staging: greybus: arche-platform: fix coldboot probe error path

[Johan Hovold]

Make sure to deregister the PM notifier in case the coldboot sequence
fails during probe.

Fixes: d29b67d44a7c ("greybus: arche-platform: Add support for init-off feature")
Reported-by: Haotian Zhang <vulab@iscas.ac.cn>
Link: https://lore.kernel.org/lkml/20251104090825.224-1-vulab@iscas.ac.cn/
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/staging/greybus/arche-platform.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
index d48464390f58..bd069d75391b 100644
--- a/drivers/staging/greybus/arche-platform.c
+++ b/drivers/staging/greybus/arche-platform.c
@@ -534,8 +534,9 @@ static int arche_platform_probe(struct platform_device *pdev)
 		mutex_lock(&arche_pdata->platform_state_mutex);
 		ret = arche_platform_coldboot_seq(arche_pdata);
 		if (ret) {
+			mutex_unlock(&arche_pdata->platform_state_mutex);
 			dev_err(dev, "Failed to cold boot svc %d\n", ret);
-			goto err_coldboot;
+			goto err_unregister_pm_notifier;
 		}
 		arche_platform_wd_irq_en(arche_pdata);
 		mutex_unlock(&arche_pdata->platform_state_mutex);
@@ -544,8 +545,8 @@ static int arche_platform_probe(struct platform_device *pdev)
 	dev_info(dev, "Device registered successfully\n");
 	return 0;
 
-err_coldboot:
-	mutex_unlock(&arche_pdata->platform_state_mutex);
+err_unregister_pm_notifier:
+	unregister_pm_notifier(&arche_pdata->pm_notifier);
 err_device_remove:
 	device_remove_file(&pdev->dev, &dev_attr_state);
 	return ret;
-- 
2.51.2

[PATCH 2/3] staging: greybus: arche-platform: fix memleak on probe failure

[Johan Hovold]

Make sure to depopulate the child devices in case of late probe
failures to avoid leaking the corresponding resources.

Fixes: fd60ac585607 ("greybus: arche-platform: Fix boot, poweroff and fw_flashing seq with APBs")
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/staging/greybus/arche-platform.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
index bd069d75391b..7dcb33a6f2e3 100644
--- a/drivers/staging/greybus/arche-platform.c
+++ b/drivers/staging/greybus/arche-platform.c
@@ -523,10 +523,9 @@ static int arche_platform_probe(struct platform_device *pdev)
 
 	arche_pdata->pm_notifier.notifier_call = arche_platform_pm_notifier;
 	ret = register_pm_notifier(&arche_pdata->pm_notifier);
-
 	if (ret) {
 		dev_err(dev, "failed to register pm notifier %d\n", ret);
-		goto err_device_remove;
+		goto err_depopulate;
 	}
 
 	/* Explicitly power off if requested */
@@ -547,6 +546,8 @@ static int arche_platform_probe(struct platform_device *pdev)
 
 err_unregister_pm_notifier:
 	unregister_pm_notifier(&arche_pdata->pm_notifier);
+err_depopulate:
+	of_platform_depopulate(dev);
 err_device_remove:
 	device_remove_file(&pdev->dev, &dev_attr_state);
 	return ret;
-- 
2.51.2

[PATCH 3/3] staging: greybus: arche-platform: fix OF populate on driver rebind

[Johan Hovold]

Since commit c6e126de43e7 ("of: Keep track of populated platform
devices") child devices will not be created by of_platform_populate()
if the devices had previously been deregistered individually so that the
OF_POPULATED flag is still set in the corresponding OF nodes.

Switch to using of_platform_depopulate() instead of open coding so that
the child devices are created if the driver is rebound.

Fixes: bc142bbb4ceb ("greybus: arche_platform: Remove child's platform device as part of _remove() fn")
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/staging/greybus/arche-platform.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
index 7dcb33a6f2e3..8aaff4e45660 100644
--- a/drivers/staging/greybus/arche-platform.c
+++ b/drivers/staging/greybus/arche-platform.c
@@ -553,22 +553,13 @@ static int arche_platform_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int arche_remove_child(struct device *dev, void *unused)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-
-	platform_device_unregister(pdev);
-
-	return 0;
-}
-
 static void arche_platform_remove(struct platform_device *pdev)
 {
 	struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);
 
 	unregister_pm_notifier(&arche_pdata->pm_notifier);
 	device_remove_file(&pdev->dev, &dev_attr_state);
-	device_for_each_child(&pdev->dev, NULL, arche_remove_child);
+	of_platform_depopulate(&pdev->dev);
 	arche_platform_poweroff_seq(arche_pdata);
 
 	if (usb3613_hub_mode_ctrl(false))
-- 
2.51.2