Merge tag 'driver-core-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

Pull driver core updates from Greg KH:
 "Here are the driver core / kernfs changes for 6.16-rc1.

  Not a huge number of changes this development cycle, here's the
  summary of what is included in here:

   - kernfs locking tweaks, pushing some global locks down into a per-fs
     image lock

   - rust driver core and pci device bindings added for new features.

   - sysfs const work for bin_attributes.

     The final churn of switching away from and removing the
     transitional struct members, "read_new", "write_new" and
     "bin_attrs_new" will come after the merge window to avoid
     unnecesary merge conflicts.

   - auxbus device creation helpers added

   - fauxbus fix for creating sysfs files after the probe completed
     properly

   - other tiny updates for driver core things.

  All of these have been in linux-next for over a week with no reported
  issues"

* tag 'driver-core-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core:
  kernfs: Relax constraint in draining guard
  Documentation: embargoed-hardware-issues.rst: Remove myself
  drivers: hv: fix up const issue with vmbus_chan_bin_attrs
  firmware_loader: use SHA-256 library API instead of crypto_shash API
  docs: debugfs: do not recommend debugfs_remove_recursive
  PM: wakeup: Do not expose 4 device wakeup source APIs
  kernfs: switch global kernfs_rename_lock to per-fs lock
  kernfs: switch global kernfs_idr_lock to per-fs lock
  driver core: auxiliary bus: Fix IS_ERR() vs NULL mixup in __devm_auxiliary_device_create()
  sysfs: constify attribute_group::bin_attrs
  sysfs: constify bin_attribute argument of bin_attribute::read/write()
  software node: Correct a OOB check in software_node_get_reference_args()
  devres: simplify devm_kstrdup() using devm_kmemdup()
  platform: replace magic number with macro PLATFORM_DEVID_NONE
  component: do not try to unbind unbound components
  driver core: auxiliary bus: add device creation helpers
  driver core: faux: Add sysfs groups after probing

Author: torvalds

Documentation/filesystems/debugfs.rst

@@ -229,22 +229,15 @@ module is unloaded without explicitly removing debugfs entries, the result
 will be a lot of stale pointers and no end of highly antisocial behavior.
 So all debugfs users - at least those which can be built as modules - must
 be prepared to remove all files and directories they create there.  A file
-can be removed with::
+or directory can be removed with::
 
     void debugfs_remove(struct dentry *dentry);
 
 The dentry value can be NULL or an error value, in which case nothing will
-be removed.
-
-Once upon a time, debugfs users were required to remember the dentry
-pointer for every debugfs file they created so that all files could be
-cleaned up.  We live in more civilized times now, though, and debugfs users
-can call::
-
-    void debugfs_remove_recursive(struct dentry *dentry);
-
-If this function is passed a pointer for the dentry corresponding to the
-top-level directory, the entire hierarchy below that directory will be
-removed.
+be removed.  Note that this function will recursively remove all files and
+directories underneath it.  Previously, debugfs_remove_recursive() was used
+to perform that task, but this function is now just an alias to
+debugfs_remove().  debugfs_remove_recursive() should be considered
+deprecated.
 
 .. [1] http://lwn.net/Articles/309298/

Documentation/process/debugging/driver_development_debugging_guide.rst

@@ -155,7 +155,7 @@ The general idea is:
     ``my_variable``
 
 - Clean up the directory when removing the device
-  (``debugfs_remove_recursive(parent);``)
+  (``debugfs_remove(parent);``)
 
 For the full documentation see :doc:`/filesystems/debugfs`.
 

Documentation/process/embargoed-hardware-issues.rst

@@ -290,7 +290,6 @@ an involved disclosed party. The current ambassadors list:
   AMD		Tom Lendacky <thomas.lendacky@amd.com>
   Ampere	Darren Hart <darren@os.amperecomputing.com>
   ARM		Catalin Marinas <catalin.marinas@arm.com>
-  IBM Power	Michael Ellerman <ellerman@au.ibm.com>
   IBM Z		Christian Borntraeger <borntraeger@de.ibm.com>
   Intel		Tony Luck <tony.luck@intel.com>
   Qualcomm	Trilok Soni <quic_tsoni@quicinc.com>

drivers/base/auxiliary.c

@@ -395,6 +395,114 @@ void auxiliary_driver_unregister(struct auxiliary_driver *auxdrv)
 }
 EXPORT_SYMBOL_GPL(auxiliary_driver_unregister);
 
+static void auxiliary_device_release(struct device *dev)
+{
+	struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
+
+	kfree(auxdev);
+}
+
+/**
+ * auxiliary_device_create - create a device on the auxiliary bus
+ * @dev: parent device
+ * @modname: module name used to create the auxiliary driver name.
+ * @devname: auxiliary bus device name
+ * @platform_data: auxiliary bus device platform data
+ * @id: auxiliary bus device id
+ *
+ * Helper to create an auxiliary bus device.
+ * The device created matches driver 'modname.devname' on the auxiliary bus.
+ */
+struct auxiliary_device *auxiliary_device_create(struct device *dev,
+						 const char *modname,
+						 const char *devname,
+						 void *platform_data,
+						 int id)
+{
+	struct auxiliary_device *auxdev;
+	int ret;
+
+	auxdev = kzalloc(sizeof(*auxdev), GFP_KERNEL);
+	if (!auxdev)
+		return NULL;
+
+	auxdev->id = id;
+	auxdev->name = devname;
+	auxdev->dev.parent = dev;
+	auxdev->dev.platform_data = platform_data;
+	auxdev->dev.release = auxiliary_device_release;
+	device_set_of_node_from_dev(&auxdev->dev, dev);
+
+	ret = auxiliary_device_init(auxdev);
+	if (ret) {
+		kfree(auxdev);
+		return NULL;
+	}
+
+	ret = __auxiliary_device_add(auxdev, modname);
+	if (ret) {
+		/*
+		 * It may look odd but auxdev should not be freed here.
+		 * auxiliary_device_uninit() calls device_put() which call
+		 * the device release function, freeing auxdev.
+		 */
+		auxiliary_device_uninit(auxdev);
+		return NULL;
+	}
+
+	return auxdev;
+}
+EXPORT_SYMBOL_GPL(auxiliary_device_create);
+
+/**
+ * auxiliary_device_destroy - remove an auxiliary device
+ * @auxdev: pointer to the auxdev to be removed
+ *
+ * Helper to remove an auxiliary device created with
+ * auxiliary_device_create()
+ */
+void auxiliary_device_destroy(void *auxdev)
+{
+	struct auxiliary_device *_auxdev = auxdev;
+
+	auxiliary_device_delete(_auxdev);
+	auxiliary_device_uninit(_auxdev);
+}
+EXPORT_SYMBOL_GPL(auxiliary_device_destroy);
+
+/**
+ * __devm_auxiliary_device_create - create a managed device on the auxiliary bus
+ * @dev: parent device
+ * @modname: module name used to create the auxiliary driver name.
+ * @devname: auxiliary bus device name
+ * @platform_data: auxiliary bus device platform data
+ * @id: auxiliary bus device id
+ *
+ * Device managed helper to create an auxiliary bus device.
+ * The device created matches driver 'modname.devname' on the auxiliary bus.
+ */
+struct auxiliary_device *__devm_auxiliary_device_create(struct device *dev,
+							const char *modname,
+							const char *devname,
+							void *platform_data,
+							int id)
+{
+	struct auxiliary_device *auxdev;
+	int ret;
+
+	auxdev = auxiliary_device_create(dev, modname, devname, platform_data, id);
+	if (!auxdev)
+		return NULL;
+
+	ret = devm_add_action_or_reset(dev, auxiliary_device_destroy,
+				       auxdev);
+	if (ret)
+		return NULL;
+
+	return auxdev;
+}
+EXPORT_SYMBOL_GPL(__devm_auxiliary_device_create);
+
 void __init auxiliary_bus_init(void)
 {
 	WARN_ON(bus_register(&auxiliary_bus_type));

drivers/base/component.c

@@ -586,7 +586,8 @@ EXPORT_SYMBOL_GPL(component_master_is_bound);
 static void component_unbind(struct component *component,
 	struct aggregate_device *adev, void *data)
 {
-	WARN_ON(!component->bound);
+	if (WARN_ON(!component->bound))
+		return;
 
 	dev_dbg(adev->parent, "unbinding %s component %p (ops %ps)\n",
 		dev_name(component->dev), component, component->ops);

drivers/base/devres.c

@@ -987,17 +987,10 @@ EXPORT_SYMBOL_GPL(devm_krealloc);
  */
 char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp)
 {
-	size_t size;
-	char *buf;
-
 	if (!s)
 		return NULL;
 
-	size = strlen(s) + 1;
-	buf = devm_kmalloc(dev, size, gfp);
-	if (buf)
-		memcpy(buf, s, size);
-	return buf;
+	return devm_kmemdup(dev, s, strlen(s) + 1, gfp);
 }
 EXPORT_SYMBOL_GPL(devm_kstrdup);
 

drivers/base/faux.c

@@ -25,6 +25,7 @@
 struct faux_object {
 	struct faux_device faux_dev;
 	const struct faux_device_ops *faux_ops;
+	const struct attribute_group **groups;
 };
 #define to_faux_object(dev) container_of_const(dev, struct faux_object, faux_dev.dev)
 
@@ -43,10 +44,21 @@ static int faux_probe(struct device *dev)
 	struct faux_object *faux_obj = to_faux_object(dev);
 	struct faux_device *faux_dev = &faux_obj->faux_dev;
 	const struct faux_device_ops *faux_ops = faux_obj->faux_ops;
-	int ret = 0;
+	int ret;
 
-	if (faux_ops && faux_ops->probe)
+	if (faux_ops && faux_ops->probe) {
 		ret = faux_ops->probe(faux_dev);
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * Add groups after the probe succeeds to ensure resources are
+	 * initialized correctly
+	 */
+	ret = device_add_groups(dev, faux_obj->groups);
+	if (ret && faux_ops && faux_ops->remove)
+		faux_ops->remove(faux_dev);
 
 	return ret;
 }
@@ -57,6 +69,8 @@ static void faux_remove(struct device *dev)
 	struct faux_device *faux_dev = &faux_obj->faux_dev;
 	const struct faux_device_ops *faux_ops = faux_obj->faux_ops;
 
+	device_remove_groups(dev, faux_obj->groups);
+
 	if (faux_ops && faux_ops->remove)
 		faux_ops->remove(faux_dev);
 }
@@ -124,8 +138,9 @@ struct faux_device *faux_device_create_with_groups(const char *name,
 	if (!faux_obj)
 		return NULL;
 
-	/* Save off the callbacks so we can use them in the future */
+	/* Save off the callbacks and groups so we can use them in the future */
 	faux_obj->faux_ops = faux_ops;
+	faux_obj->groups = groups;
 
 	/* Initialize the device portion and register it with the driver core */
 	faux_dev = &faux_obj->faux_dev;
@@ -138,7 +153,6 @@ struct faux_device *faux_device_create_with_groups(const char *name,
 	else
 		dev->parent = &faux_bus_root;
 	dev->bus = &faux_bus_type;
-	dev->groups = groups;
 	dev_set_name(dev, "%s", name);
 
 	ret = device_add(dev);

drivers/base/firmware_loader/Kconfig

@@ -3,8 +3,7 @@ menu "Firmware loader"
 
 config FW_LOADER
 	tristate "Firmware loading facility" if EXPERT
-	select CRYPTO_HASH if FW_LOADER_DEBUG
-	select CRYPTO_SHA256 if FW_LOADER_DEBUG
+	select CRYPTO_LIB_SHA256 if FW_LOADER_DEBUG
 	default y
 	help
 	  This enables the firmware loading facility in the kernel. The kernel
@@ -28,7 +27,6 @@ config FW_LOADER
 
 config FW_LOADER_DEBUG
 	bool "Log filenames and checksums for loaded firmware"
-	depends on CRYPTO = FW_LOADER || CRYPTO=y
 	depends on DYNAMIC_DEBUG
 	depends on FW_LOADER
 	default FW_LOADER

drivers/base/firmware_loader/main.c

@@ -806,41 +806,15 @@ static void fw_abort_batch_reqs(struct firmware *fw)
 }
 
 #if defined(CONFIG_FW_LOADER_DEBUG)
-#include <crypto/hash.h>
 #include <crypto/sha2.h>
 
 static void fw_log_firmware_info(const struct firmware *fw, const char *name, struct device *device)
 {
-	struct shash_desc *shash;
-	struct crypto_shash *alg;
-	u8 *sha256buf;
-	char *outbuf;
+	u8 digest[SHA256_DIGEST_SIZE];
 
-	alg = crypto_alloc_shash("sha256", 0, 0);
-	if (IS_ERR(alg))
-		return;
-
-	sha256buf = kmalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
-	outbuf = kmalloc(SHA256_BLOCK_SIZE + 1, GFP_KERNEL);
-	shash = kmalloc(sizeof(*shash) + crypto_shash_descsize(alg), GFP_KERNEL);
-	if (!sha256buf || !outbuf || !shash)
-		goto out_free;
-
-	shash->tfm = alg;
-
-	if (crypto_shash_digest(shash, fw->data, fw->size, sha256buf) < 0)
-		goto out_free;
-
-	for (int i = 0; i < SHA256_DIGEST_SIZE; i++)
-		sprintf(&outbuf[i * 2], "%02x", sha256buf[i]);
-	outbuf[SHA256_BLOCK_SIZE] = 0;
-	dev_dbg(device, "Loaded FW: %s, sha256: %s\n", name, outbuf);
-
-out_free:
-	kfree(shash);
-	kfree(outbuf);
-	kfree(sha256buf);
-	crypto_free_shash(alg);
+	sha256(fw->data, fw->size, digest);
+	dev_dbg(device, "Loaded FW: %s, sha256: %*phN\n",
+		name, SHA256_DIGEST_SIZE, digest);
 }
 #else
 static void fw_log_firmware_info(const struct firmware *fw, const char *name,

drivers/base/platform.c

@@ -982,7 +982,7 @@ struct platform_device * __init_or_module __platform_create_bundle(
 	struct platform_device *pdev;
 	int error;
 
-	pdev = platform_device_alloc(driver->driver.name, -1);
+	pdev = platform_device_alloc(driver->driver.name, PLATFORM_DEVID_NONE);
 	if (!pdev) {
 		error = -ENOMEM;
 		goto err_out;