Merge tag 'pci-v6.11-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull pci fixes from Bjorn Helgaas:

 - Unregister platform devices for child nodes when stopping a PCI
   device, even if the PCI core has already cleared the OF_POPULATED bit
   and of_platform_depopulate() doesn't do anything (Bartosz
   Golaszewski)

 - Rescan the bus from a separate thread so we don't deadlock when
   triggering rescan from sysfs (Bartosz Golaszewski)

* tag 'pci-v6.11-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  PCI/pwrctl: Rescan bus on a separate thread
  PCI: Don't rely on of_platform_depopulate() for reused OF-nodes

drivers/pci/pwrctl/core.c

@@ -48,6 +48,28 @@ static int pci_pwrctl_notify(struct notifier_block *nb, unsigned long action,
 	return NOTIFY_DONE;
 }
 
+static void rescan_work_func(struct work_struct *work)
+{
+	struct pci_pwrctl *pwrctl = container_of(work, struct pci_pwrctl, work);
+
+	pci_lock_rescan_remove();
+	pci_rescan_bus(to_pci_dev(pwrctl->dev->parent)->bus);
+	pci_unlock_rescan_remove();
+}
+
+/**
+ * pci_pwrctl_init() - Initialize the PCI power control context struct
+ *
+ * @pwrctl: PCI power control data
+ * @dev: Parent device
+ */
+void pci_pwrctl_init(struct pci_pwrctl *pwrctl, struct device *dev)
+{
+	pwrctl->dev = dev;
+	INIT_WORK(&pwrctl->work, rescan_work_func);
+}
+EXPORT_SYMBOL_GPL(pci_pwrctl_init);
+
 /**
  * pci_pwrctl_device_set_ready() - Notify the pwrctl subsystem that the PCI
  * device is powered-up and ready to be detected.
@@ -74,9 +96,7 @@ int pci_pwrctl_device_set_ready(struct pci_pwrctl *pwrctl)
 	if (ret)
 		return ret;
 
-	pci_lock_rescan_remove();
-	pci_rescan_bus(to_pci_dev(pwrctl->dev->parent)->bus);
-	pci_unlock_rescan_remove();
+	schedule_work(&pwrctl->work);
 
 	return 0;
 }

drivers/pci/pwrctl/pci-pwrctl-pwrseq.c

@@ -50,7 +50,7 @@ static int pci_pwrctl_pwrseq_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	data->ctx.dev = dev;
+	pci_pwrctl_init(&data->ctx, dev);
 
 	ret = devm_pci_pwrctl_device_set_ready(dev, &data->ctx);
 	if (ret)

drivers/pci/remove.c

 // SPDX-License-Identifier: GPL-2.0
 #include <linux/pci.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
 #include "pci.h"
 
 static void pci_free_resources(struct pci_dev *dev)
@@ -14,12 +17,25 @@ static void pci_free_resources(struct pci_dev *dev)
 	}
 }
 
+static int pci_pwrctl_unregister(struct device *dev, void *data)
+{
+	struct device_node *pci_node = data, *plat_node = dev_of_node(dev);
+
+	if (dev_is_platform(dev) && plat_node && plat_node == pci_node) {
+		of_device_unregister(to_platform_device(dev));
+		of_node_clear_flag(plat_node, OF_POPULATED);
+	}
+
+	return 0;
+}
+
 static void pci_stop_dev(struct pci_dev *dev)
 {
 	pci_pme_active(dev, false);
 
 	if (pci_dev_is_added(dev)) {
-		of_platform_depopulate(&dev->dev);
+		device_for_each_child(dev->dev.parent, dev_of_node(&dev->dev),
+				      pci_pwrctl_unregister);
 		device_release_driver(&dev->dev);
 		pci_proc_detach_device(dev);
 		pci_remove_sysfs_dev_files(dev);

include/linux/pci-pwrctl.h

@@ -7,6 +7,7 @@
 #define __PCI_PWRCTL_H__
 
 #include <linux/notifier.h>
+#include <linux/workqueue.h>
 
 struct device;
 struct device_link;
@@ -41,8 +42,10 @@ struct pci_pwrctl {
 	/* Private: don't use. */
 	struct notifier_block nb;
 	struct device_link *link;
+	struct work_struct work;
 };
 
+void pci_pwrctl_init(struct pci_pwrctl *pwrctl, struct device *dev);
 int pci_pwrctl_device_set_ready(struct pci_pwrctl *pwrctl);
 void pci_pwrctl_device_unset_ready(struct pci_pwrctl *pwrctl);
 int devm_pci_pwrctl_device_set_ready(struct device *dev,