Merge tag 'driver-core-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core / debugfs update from Greg KH:
 "Here is the "big" driver core and debugfs update for 5.12-rc1

  This set of driver core patches caused a bunch of problems in
  linux-next for the past few weeks, when Saravana tried to set
  fw_devlink=on as the default functionality. This caused a number of
  systems to stop booting, and lots of bugs were fixed in this area for
  almost all of the reported systems, but this option is not ready to be
  turned on just yet for the default operation based on this testing, so
  I've reverted that change at the very end so we don't have to worry
  about regressions in 5.12

  We will try to turn this on for 5.13 if testing goes better over the
  next few months.

  Other than the fixes caused by the fw_devlink testing in here, there's
  not much more:

   - debugfs fixes for invalid input into debugfs_lookup()

   - kerneldoc cleanups

   - warn message if platform drivers return an error on their remove
     callback (a futile effort, but good to catch).

  All of these have been in linux-next for a while now, and the
  regressions have gone away with the revert of the fw_devlink change"

* tag 'driver-core-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (35 commits)
  Revert "driver core: Set fw_devlink=on by default"
  of: property: fw_devlink: Ignore interrupts property for some configs
  debugfs: do not attempt to create a new file before the filesystem is initalized
  debugfs: be more robust at handling improper input in debugfs_lookup()
  driver core: auxiliary bus: Fix calling stage for auxiliary bus init
  of: irq: Fix the return value for of_irq_parse_one() stub
  of: irq: make a stub for of_irq_parse_one()
  clk: Mark fwnodes when their clock provider is added/removed
  PM: domains: Mark fwnodes when their powerdomain is added/removed
  irqdomain: Mark fwnodes when their irqdomain is added/removed
  driver core: fw_devlink: Handle suppliers that don't use driver core
  of: property: Add fw_devlink support for optional properties
  driver core: Add fw_devlink.strict kernel param
  of: property: Don't add links to absent suppliers
  driver core: fw_devlink: Detect supplier devices that will never be added
  driver core: platform: Emit a warning if a remove callback returned non-zero
  of: property: Fix fw_devlink handling of interrupts/interrupts-extended
  gpiolib: Don't probe gpio_device if it's not the primary device
  device.h: Remove bogus "the" in kerneldoc
  gpiolib: Bind gpio_device to a driver to enable fw_devlink=on by default
  ...

9 files changed, 164 insertions, 49 deletions

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 040be48ce046..324aa03fed3c 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -161,7 +161,7 @@ config HMEM_REPORTING
 	default n
 	depends on NUMA
 	help
-	  Enable reporting for heterogenous memory access attributes under
+	  Enable reporting for heterogeneous memory access attributes under
 	  their non-uniform memory nodes.
 
 source "drivers/base/test/Kconfig"
diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
index 8336535f1e11..d8b314e7d0fd 100644
--- a/drivers/base/auxiliary.c
+++ b/drivers/base/auxiliary.c
@@ -15,6 +15,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/string.h>
 #include <linux/auxiliary_bus.h>
+#include "base.h"
 
 static const struct auxiliary_device_id *auxiliary_match_id(const struct auxiliary_device_id *id,
 							    const struct auxiliary_device *auxdev)
@@ -260,19 +261,11 @@ void auxiliary_driver_unregister(struct auxiliary_driver *auxdrv)
 }
 EXPORT_SYMBOL_GPL(auxiliary_driver_unregister);
 
-static int __init auxiliary_bus_init(void)
+void __init auxiliary_bus_init(void)
 {
-	return bus_register(&auxiliary_bus_type);
+	WARN_ON(bus_register(&auxiliary_bus_type));
 }
 
-static void __exit auxiliary_bus_exit(void)
-{
-	bus_unregister(&auxiliary_bus_type);
-}
-
-module_init(auxiliary_bus_init);
-module_exit(auxiliary_bus_exit);
-
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Auxiliary Bus");
 MODULE_AUTHOR("David Ertman <david.m.ertman@intel.com>");
diff --git a/drivers/base/base.h b/drivers/base/base.h
index f5600a83124f..52b3d7b75c27 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -119,6 +119,11 @@ static inline int hypervisor_init(void) { return 0; }
 extern int platform_bus_init(void);
 extern void cpu_dev_init(void);
 extern void container_dev_init(void);
+#ifdef CONFIG_AUXILIARY_BUS
+extern void auxiliary_bus_init(void);
+#else
+static inline void auxiliary_bus_init(void) { }
+#endif
 
 struct kobject *virtual_device_parent(struct device *dev);
 
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index a9c23ecebc7c..36d0c654ea61 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -633,7 +633,7 @@ int bus_add_driver(struct device_driver *drv)
 	error = driver_add_groups(drv, bus->drv_groups);
 	if (error) {
 		/* How the hell do we get out of this pickle? Give up */
-		printk(KERN_ERR "%s: driver_create_groups(%s) failed\n",
+		printk(KERN_ERR "%s: driver_add_groups(%s) failed\n",
 			__func__, drv->name);
 	}
 
@@ -729,23 +729,6 @@ int device_reprobe(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(device_reprobe);
 
-/**
- * find_bus - locate bus by name.
- * @name: name of bus.
- *
- * Call kset_find_obj() to iterate over list of buses to
- * find a bus by name. Return bus if found.
- *
- * Note that kset_find_obj increments bus' reference count.
- */
-#if 0
-struct bus_type *find_bus(char *name)
-{
-	struct kobject *k = kset_find_obj(bus_kset, name);
-	return k ? to_bus(k) : NULL;
-}
-#endif  /*  0  */
-
 static int bus_add_groups(struct bus_type *bus,
 			  const struct attribute_group **groups)
 {
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 7c0406e675e9..f29839382f81 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -149,6 +149,21 @@ void fwnode_links_purge(struct fwnode_handle *fwnode)
 	fwnode_links_purge_consumers(fwnode);
 }
 
+static void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *child;
+
+	/* Don't purge consumer links of an added child */
+	if (fwnode->dev)
+		return;
+
+	fwnode->flags |= FWNODE_FLAG_NOT_DEVICE;
+	fwnode_links_purge_consumers(fwnode);
+
+	fwnode_for_each_available_child_node(fwnode, child)
+		fw_devlink_purge_absent_suppliers(child);
+}
+
 #ifdef CONFIG_SRCU
 static DEFINE_MUTEX(device_links_lock);
 DEFINE_STATIC_SRCU(device_links_srcu);
@@ -245,7 +260,8 @@ int device_is_dependent(struct device *dev, void *target)
 		return ret;
 
 	list_for_each_entry(link, &dev->links.consumers, s_node) {
-		if (link->flags == (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
+		if ((link->flags & ~DL_FLAG_INFERRED) ==
+		    (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
 			continue;
 
 		if (link->consumer == target)
@@ -318,7 +334,8 @@ static int device_reorder_to_tail(struct device *dev, void *not_used)
 
 	device_for_each_child(dev, NULL, device_reorder_to_tail);
 	list_for_each_entry(link, &dev->links.consumers, s_node) {
-		if (link->flags == (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
+		if ((link->flags & ~DL_FLAG_INFERRED) ==
+		    (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
 			continue;
 		device_reorder_to_tail(link->consumer, NULL);
 	}
@@ -566,7 +583,8 @@ postcore_initcall(devlink_class_init);
 #define DL_MANAGED_LINK_FLAGS (DL_FLAG_AUTOREMOVE_CONSUMER | \
 			       DL_FLAG_AUTOREMOVE_SUPPLIER | \
 			       DL_FLAG_AUTOPROBE_CONSUMER  | \
-			       DL_FLAG_SYNC_STATE_ONLY)
+			       DL_FLAG_SYNC_STATE_ONLY | \
+			       DL_FLAG_INFERRED)
 
 #define DL_ADD_VALID_FLAGS (DL_MANAGED_LINK_FLAGS | DL_FLAG_STATELESS | \
 			    DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE)
@@ -635,7 +653,7 @@ struct device_link *device_link_add(struct device *consumer,
 	if (!consumer || !supplier || flags & ~DL_ADD_VALID_FLAGS ||
 	    (flags & DL_FLAG_STATELESS && flags & DL_MANAGED_LINK_FLAGS) ||
 	    (flags & DL_FLAG_SYNC_STATE_ONLY &&
-	     flags != DL_FLAG_SYNC_STATE_ONLY) ||
+	     (flags & ~DL_FLAG_INFERRED) != DL_FLAG_SYNC_STATE_ONLY) ||
 	    (flags & DL_FLAG_AUTOPROBE_CONSUMER &&
 	     flags & (DL_FLAG_AUTOREMOVE_CONSUMER |
 		      DL_FLAG_AUTOREMOVE_SUPPLIER)))
@@ -691,6 +709,10 @@ struct device_link *device_link_add(struct device *consumer,
 		if (link->consumer != consumer)
 			continue;
 
+		if (link->flags & DL_FLAG_INFERRED &&
+		    !(flags & DL_FLAG_INFERRED))
+			link->flags &= ~DL_FLAG_INFERRED;
+
 		if (flags & DL_FLAG_PM_RUNTIME) {
 			if (!(link->flags & DL_FLAG_PM_RUNTIME)) {
 				pm_runtime_new_link(consumer);
@@ -950,6 +972,10 @@ int device_links_check_suppliers(struct device *dev)
 	mutex_lock(&fwnode_link_lock);
 	if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) &&
 	    !fw_devlink_is_permissive()) {
+		dev_dbg(dev, "probe deferral - wait for supplier %pfwP\n",
+			list_first_entry(&dev->fwnode->suppliers,
+			struct fwnode_link,
+			c_hook)->supplier);
 		mutex_unlock(&fwnode_link_lock);
 		return -EPROBE_DEFER;
 	}
@@ -964,6 +990,8 @@ int device_links_check_suppliers(struct device *dev)
 		if (link->status != DL_STATE_AVAILABLE &&
 		    !(link->flags & DL_FLAG_SYNC_STATE_ONLY)) {
 			device_links_missing_supplier(dev);
+			dev_dbg(dev, "probe deferral - supplier %s not ready\n",
+				dev_name(link->supplier));
 			ret = -EPROBE_DEFER;
 			break;
 		}
@@ -1142,12 +1170,22 @@ void device_links_driver_bound(struct device *dev)
 	LIST_HEAD(sync_list);
 
 	/*
-	 * If a device probes successfully, it's expected to have created all
+	 * If a device binds successfully, it's expected to have created all
 	 * the device links it needs to or make new device links as it needs
-	 * them. So, it no longer needs to wait on any suppliers.
+	 * them. So, fw_devlink no longer needs to create device links to any
+	 * of the device's suppliers.
+	 *
+	 * Also, if a child firmware node of this bound device is not added as
+	 * a device by now, assume it is never going to be added and make sure
+	 * other devices don't defer probe indefinitely by waiting for such a
+	 * child device.
 	 */
-	if (dev->fwnode && dev->fwnode->dev == dev)
+	if (dev->fwnode && dev->fwnode->dev == dev) {
+		struct fwnode_handle *child;
 		fwnode_links_purge_suppliers(dev->fwnode);
+		fwnode_for_each_available_child_node(dev->fwnode, child)
+			fw_devlink_purge_absent_suppliers(child);
+	}
 	device_remove_file(dev, &dev_attr_waiting_for_supplier);
 
 	device_links_write_lock();
@@ -1458,7 +1496,14 @@ static void device_links_purge(struct device *dev)
 	device_links_write_unlock();
 }
 
-static u32 fw_devlink_flags = DL_FLAG_SYNC_STATE_ONLY;
+#define FW_DEVLINK_FLAGS_PERMISSIVE	(DL_FLAG_INFERRED | \
+					 DL_FLAG_SYNC_STATE_ONLY)
+#define FW_DEVLINK_FLAGS_ON		(DL_FLAG_INFERRED | \
+					 DL_FLAG_AUTOPROBE_CONSUMER)
+#define FW_DEVLINK_FLAGS_RPM		(FW_DEVLINK_FLAGS_ON | \
+					 DL_FLAG_PM_RUNTIME)
+
+static u32 fw_devlink_flags = FW_DEVLINK_FLAGS_PERMISSIVE;
 static int __init fw_devlink_setup(char *arg)
 {
 	if (!arg)
@@ -1467,17 +1512,23 @@ static int __init fw_devlink_setup(char *arg)
 	if (strcmp(arg, "off") == 0) {
 		fw_devlink_flags = 0;
 	} else if (strcmp(arg, "permissive") == 0) {
-		fw_devlink_flags = DL_FLAG_SYNC_STATE_ONLY;
+		fw_devlink_flags = FW_DEVLINK_FLAGS_PERMISSIVE;
 	} else if (strcmp(arg, "on") == 0) {
-		fw_devlink_flags = DL_FLAG_AUTOPROBE_CONSUMER;
+		fw_devlink_flags = FW_DEVLINK_FLAGS_ON;
 	} else if (strcmp(arg, "rpm") == 0) {
-		fw_devlink_flags = DL_FLAG_AUTOPROBE_CONSUMER |
-				   DL_FLAG_PM_RUNTIME;
+		fw_devlink_flags = FW_DEVLINK_FLAGS_RPM;
 	}
 	return 0;
 }
 early_param("fw_devlink", fw_devlink_setup);
 
+static bool fw_devlink_strict;
+static int __init fw_devlink_strict_setup(char *arg)
+{
+	return strtobool(arg, &fw_devlink_strict);
+}
+early_param("fw_devlink.strict", fw_devlink_strict_setup);
+
 u32 fw_devlink_get_flags(void)
 {
 	return fw_devlink_flags;
@@ -1485,7 +1536,12 @@ u32 fw_devlink_get_flags(void)
 
 static bool fw_devlink_is_permissive(void)
 {
-	return fw_devlink_flags == DL_FLAG_SYNC_STATE_ONLY;
+	return fw_devlink_flags == FW_DEVLINK_FLAGS_PERMISSIVE;
+}
+
+bool fw_devlink_is_strict(void)
+{
+	return fw_devlink_strict && !fw_devlink_is_permissive();
 }
 
 static void fw_devlink_parse_fwnode(struct fwnode_handle *fwnode)
@@ -1508,6 +1564,53 @@ static void fw_devlink_parse_fwtree(struct fwnode_handle *fwnode)
 }
 
 /**
+ * fw_devlink_relax_cycle - Convert cyclic links to SYNC_STATE_ONLY links
+ * @con: Device to check dependencies for.
+ * @sup: Device to check against.
+ *
+ * Check if @sup depends on @con or any device dependent on it (its child or
+ * its consumer etc).  When such a cyclic dependency is found, convert all
+ * device links created solely by fw_devlink into SYNC_STATE_ONLY device links.
+ * This is the equivalent of doing fw_devlink=permissive just between the
+ * devices in the cycle. We need to do this because, at this point, fw_devlink
+ * can't tell which of these dependencies is not a real dependency.
+ *
+ * Return 1 if a cycle is found. Otherwise, return 0.
+ */
+static int fw_devlink_relax_cycle(struct device *con, void *sup)
+{
+	struct device_link *link;
+	int ret;
+
+	if (con == sup)
+		return 1;
+
+	ret = device_for_each_child(con, sup, fw_devlink_relax_cycle);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(link, &con->links.consumers, s_node) {
+		if ((link->flags & ~DL_FLAG_INFERRED) ==
+		    (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
+			continue;
+
+		if (!fw_devlink_relax_cycle(link->consumer, sup))
+			continue;
+
+		ret = 1;
+
+		if (!(link->flags & DL_FLAG_INFERRED))
+			continue;
+
+		pm_runtime_drop_link(link);
+		link->flags = DL_FLAG_MANAGED | FW_DEVLINK_FLAGS_PERMISSIVE;
+		dev_dbg(link->consumer, "Relaxing link with %s\n",
+			dev_name(link->supplier));
+	}
+	return ret;
+}
+
+/**
  * fw_devlink_create_devlink - Create a device link from a consumer to fwnode
  * @con - Consumer device for the device link
  * @sup_handle - fwnode handle of supplier
@@ -1535,15 +1638,39 @@ static int fw_devlink_create_devlink(struct device *con,
 	sup_dev = get_dev_from_fwnode(sup_handle);
 	if (sup_dev) {
 		/*
+		 * If it's one of those drivers that don't actually bind to
+		 * their device using driver core, then don't wait on this
+		 * supplier device indefinitely.
+		 */
+		if (sup_dev->links.status == DL_DEV_NO_DRIVER &&
+		    sup_handle->flags & FWNODE_FLAG_INITIALIZED) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		/*
 		 * If this fails, it is due to cycles in device links.  Just
 		 * give up on this link and treat it as invalid.
 		 */
-		if (!device_link_add(con, sup_dev, flags))
+		if (!device_link_add(con, sup_dev, flags) &&
+		    !(flags & DL_FLAG_SYNC_STATE_ONLY)) {
+			dev_info(con, "Fixing up cyclic dependency with %s\n",
+				 dev_name(sup_dev));
+			device_links_write_lock();
+			fw_devlink_relax_cycle(con, sup_dev);
+			device_links_write_unlock();
+			device_link_add(con, sup_dev,
+					FW_DEVLINK_FLAGS_PERMISSIVE);
 			ret = -EINVAL;
+		}
 
 		goto out;
 	}
 
+	/* Supplier that's already initialized without a struct device. */
+	if (sup_handle->flags & FWNODE_FLAG_INITIALIZED)
+		return -EINVAL;
+
 	/*
 	 * DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports
 	 * cycles. So cycle detection isn't necessary and shouldn't be
@@ -1632,7 +1759,7 @@ static void __fw_devlink_link_to_consumers(struct device *dev)
 				con_dev = NULL;
 			} else {
 				own_link = false;
-				dl_flags = DL_FLAG_SYNC_STATE_ONLY;
+				dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE;
 			}
 		}
 
@@ -1687,7 +1814,7 @@ static void __fw_devlink_link_to_suppliers(struct device *dev,
 	if (own_link)
 		dl_flags = fw_devlink_get_flags();
 	else
-		dl_flags = DL_FLAG_SYNC_STATE_ONLY;
+		dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE;
 
 	list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) {
 		int ret;
diff --git a/drivers/base/init.c b/drivers/base/init.c
index 908e6520e804..a9f57c22fb9e 100644
--- a/drivers/base/init.c
+++ b/drivers/base/init.c
@@ -32,6 +32,7 @@ void __init driver_init(void)
 	 */
 	of_core_init();
 	platform_bus_init();
+	auxiliary_bus_init();
 	cpu_dev_init();
 	memory_dev_init();
 	container_dev_init();
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index ac68328b0aca..6e1f8e0b661c 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1463,13 +1463,16 @@ static int platform_remove(struct device *_dev)
 {
 	struct platform_driver *drv = to_platform_driver(_dev->driver);
 	struct platform_device *dev = to_platform_device(_dev);
-	int ret = 0;
 
-	if (drv->remove)
-		ret = drv->remove(dev);
+	if (drv->remove) {
+		int ret = drv->remove(dev);
+
+		if (ret)
+			dev_warn(_dev, "remove callback returned a non-zero value. This will be ignored.\n");
+	}
 	dev_pm_domain_detach(_dev, true);
 
-	return ret;
+	return 0;
 }
 
 static void platform_shutdown(struct device *_dev)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index aaf6c83b5cf6..78c310d3179d 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2196,6 +2196,7 @@ static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
 	cp->node = of_node_get(np);
 	cp->data = data;
 	cp->xlate = xlate;
+	fwnode_dev_initialized(&np->fwnode, true);
 
 	mutex_lock(&of_genpd_mutex);
 	list_add(&cp->link, &of_genpd_providers);
@@ -2385,6 +2386,7 @@ void of_genpd_del_provider(struct device_node *np)
 				}
 			}
 
+			fwnode_dev_initialized(&cp->node->fwnode, false);
 			list_del(&cp->link);
 			of_node_put(cp->node);
 			kfree(cp);
diff --git a/drivers/base/test/Makefile b/drivers/base/test/Makefile
index 3ca56367c84b..2f15fae8625f 100644
--- a/drivers/base/test/Makefile
+++ b/drivers/base/test/Makefile
@@ -2,3 +2,4 @@
 obj-$(CONFIG_TEST_ASYNC_DRIVER_PROBE)	+= test_async_driver_probe.o
 
 obj-$(CONFIG_KUNIT_DRIVER_PE_TEST) += property-entry-test.o
+CFLAGS_REMOVE_property-entry-test.o += -fplugin-arg-structleak_plugin-byref -fplugin-arg-structleak_plugin-byref-all