Merge tag 'driver-core-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core and debugfs updates from Greg KH:
 "Here is the "big" driver core and debugfs changes for 5.3-rc1

  It's a lot of different patches, all across the tree due to some api
  changes and lots of debugfs cleanups.

  Other than the debugfs cleanups, in this set of changes we have:

   - bus iteration function cleanups

   - scripts/get_abi.pl tool to display and parse Documentation/ABI
     entries in a simple way

   - cleanups to Documenatation/ABI/ entries to make them parse easier
     due to typos and other minor things

   - default_attrs use for some ktype users

   - driver model documentation file conversions to .rst

   - compressed firmware file loading

   - deferred probe fixes

  All of these have been in linux-next for a while, with a bunch of
  merge issues that Stephen has been patient with me for"

* tag 'driver-core-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (102 commits)
  debugfs: make error message a bit more verbose
  orangefs: fix build warning from debugfs cleanup patch
  ubifs: fix build warning after debugfs cleanup patch
  driver: core: Allow subsystems to continue deferring probe
  drivers: base: cacheinfo: Ensure cpu hotplug work is done before Intel RDT
  arch_topology: Remove error messages on out-of-memory conditions
  lib: notifier-error-inject: no need to check return value of debugfs_create functions
  swiotlb: no need to check return value of debugfs_create functions
  ceph: no need to check return value of debugfs_create functions
  sunrpc: no need to check return value of debugfs_create functions
  ubifs: no need to check return value of debugfs_create functions
  orangefs: no need to check return value of debugfs_create functions
  nfsd: no need to check return value of debugfs_create functions
  lib: 842: no need to check return value of debugfs_create functions
  debugfs: provide pr_fmt() macro
  debugfs: log errors when something goes wrong
  drivers: s390/cio: Fix compilation warning about const qualifiers
  drivers: Add generic helper to match by of_node
  driver_find_device: Unify the match function with class_find_device()
  bus_find_device: Unify the match callback with class_find_device
  ...

5 files changed, 34 insertions, 73 deletions

diff --git a/lib/842/842_debugfs.h b/lib/842/842_debugfs.h
index 277e403e8701..4469407c3e0d 100644
--- a/lib/842/842_debugfs.h
+++ b/lib/842/842_debugfs.h
@@ -22,8 +22,6 @@ static int __init sw842_debugfs_create(void)
 		return -ENODEV;
 
 	sw842_debugfs_root = debugfs_create_dir(MODULE_NAME, NULL);
-	if (IS_ERR(sw842_debugfs_root))
-		return PTR_ERR(sw842_debugfs_root);
 
 	for (i = 0; i < ARRAY_SIZE(template_count); i++) {
 		char name[32];
@@ -46,8 +44,7 @@ static int __init sw842_debugfs_create(void)
 
 static void __exit sw842_debugfs_remove(void)
 {
-	if (sw842_debugfs_root && !IS_ERR(sw842_debugfs_root))
-		debugfs_remove_recursive(sw842_debugfs_root);
+	debugfs_remove_recursive(sw842_debugfs_root);
 }
 
 #endif
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 8a16c2d498e9..c60409138e13 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -993,20 +993,14 @@ static __initdata int ddebug_init_success;
 
 static int __init dynamic_debug_init_debugfs(void)
 {
-	struct dentry *dir, *file;
+	struct dentry *dir;
 
 	if (!ddebug_init_success)
 		return -ENODEV;
 
 	dir = debugfs_create_dir("dynamic_debug", NULL);
-	if (!dir)
-		return -ENOMEM;
-	file = debugfs_create_file("control", 0644, dir, NULL,
-					&ddebug_proc_fops);
-	if (!file) {
-		debugfs_remove(dir);
-		return -ENOMEM;
-	}
+	debugfs_create_file("control", 0644, dir, NULL, &ddebug_proc_fops);
+
 	return 0;
 }
 
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index 3cb21b2bf088..8186ca84910b 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -166,10 +166,10 @@ static int debugfs_ul_get(void *data, u64 *val)
 
 DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
 
-static struct dentry *debugfs_create_ul(const char *name, umode_t mode,
-				struct dentry *parent, unsigned long *value)
+static void debugfs_create_ul(const char *name, umode_t mode,
+			      struct dentry *parent, unsigned long *value)
 {
-	return debugfs_create_file(name, mode, parent, value, &fops_ul);
+	debugfs_create_file(name, mode, parent, value, &fops_ul);
 }
 
 #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
@@ -185,12 +185,11 @@ static int debugfs_stacktrace_depth_set(void *data, u64 val)
 DEFINE_SIMPLE_ATTRIBUTE(fops_stacktrace_depth, debugfs_ul_get,
 			debugfs_stacktrace_depth_set, "%llu\n");
 
-static struct dentry *debugfs_create_stacktrace_depth(
-	const char *name, umode_t mode,
-	struct dentry *parent, unsigned long *value)
+static void debugfs_create_stacktrace_depth(const char *name, umode_t mode,
+					    struct dentry *parent,
+					    unsigned long *value)
 {
-	return debugfs_create_file(name, mode, parent, value,
-				   &fops_stacktrace_depth);
+	debugfs_create_file(name, mode, parent, value, &fops_stacktrace_depth);
 }
 
 #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
@@ -202,51 +201,31 @@ struct dentry *fault_create_debugfs_attr(const char *name,
 	struct dentry *dir;
 
 	dir = debugfs_create_dir(name, parent);
-	if (!dir)
-		return ERR_PTR(-ENOMEM);
-
-	if (!debugfs_create_ul("probability", mode, dir, &attr->probability))
-		goto fail;
-	if (!debugfs_create_ul("interval", mode, dir, &attr->interval))
-		goto fail;
-	if (!debugfs_create_atomic_t("times", mode, dir, &attr->times))
-		goto fail;
-	if (!debugfs_create_atomic_t("space", mode, dir, &attr->space))
-		goto fail;
-	if (!debugfs_create_ul("verbose", mode, dir, &attr->verbose))
-		goto fail;
-	if (!debugfs_create_u32("verbose_ratelimit_interval_ms", mode, dir,
-				&attr->ratelimit_state.interval))
-		goto fail;
-	if (!debugfs_create_u32("verbose_ratelimit_burst", mode, dir,
-				&attr->ratelimit_state.burst))
-		goto fail;
-	if (!debugfs_create_bool("task-filter", mode, dir, &attr->task_filter))
-		goto fail;
+	if (IS_ERR(dir))
+		return dir;
+
+	debugfs_create_ul("probability", mode, dir, &attr->probability);
+	debugfs_create_ul("interval", mode, dir, &attr->interval);
+	debugfs_create_atomic_t("times", mode, dir, &attr->times);
+	debugfs_create_atomic_t("space", mode, dir, &attr->space);
+	debugfs_create_ul("verbose", mode, dir, &attr->verbose);
+	debugfs_create_u32("verbose_ratelimit_interval_ms", mode, dir,
+			   &attr->ratelimit_state.interval);
+	debugfs_create_u32("verbose_ratelimit_burst", mode, dir,
+			   &attr->ratelimit_state.burst);
+	debugfs_create_bool("task-filter", mode, dir, &attr->task_filter);
 
 #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
-
-	if (!debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
-				&attr->stacktrace_depth))
-		goto fail;
-	if (!debugfs_create_ul("require-start", mode, dir,
-				&attr->require_start))
-		goto fail;
-	if (!debugfs_create_ul("require-end", mode, dir, &attr->require_end))
-		goto fail;
-	if (!debugfs_create_ul("reject-start", mode, dir, &attr->reject_start))
-		goto fail;
-	if (!debugfs_create_ul("reject-end", mode, dir, &attr->reject_end))
-		goto fail;
-
+	debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
+					&attr->stacktrace_depth);
+	debugfs_create_ul("require-start", mode, dir, &attr->require_start);
+	debugfs_create_ul("require-end", mode, dir, &attr->require_end);
+	debugfs_create_ul("reject-start", mode, dir, &attr->reject_start);
+	debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);
 #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
 
 	attr->dname = dget(dir);
 	return dir;
-fail:
-	debugfs_remove_recursive(dir);
-
-	return ERR_PTR(-ENOMEM);
 }
 EXPORT_SYMBOL_GPL(fault_create_debugfs_attr);
 
diff --git a/lib/kobject.c b/lib/kobject.c
index f2ccdbac8ed9..83198cb37d8d 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -498,8 +498,10 @@ int kobject_rename(struct kobject *kobj, const char *new_name)
 	kobj = kobject_get(kobj);
 	if (!kobj)
 		return -EINVAL;
-	if (!kobj->parent)
+	if (!kobj->parent) {
+		kobject_put(kobj);
 		return -EINVAL;
+	}
 
 	devpath = kobject_get_path(kobj, GFP_KERNEL);
 	if (!devpath) {
diff --git a/lib/notifier-error-inject.c b/lib/notifier-error-inject.c
index 3d2ba7cf83f4..21016b32d313 100644
--- a/lib/notifier-error-inject.c
+++ b/lib/notifier-error-inject.c
@@ -59,33 +59,22 @@ struct dentry *notifier_err_inject_init(const char *name, struct dentry *parent,
 	err_inject->nb.priority = priority;
 
 	dir = debugfs_create_dir(name, parent);
-	if (!dir)
-		return ERR_PTR(-ENOMEM);
 
 	actions_dir = debugfs_create_dir("actions", dir);
-	if (!actions_dir)
-		goto fail;
 
 	for (action = err_inject->actions; action->name; action++) {
 		struct dentry *action_dir;
 
 		action_dir = debugfs_create_dir(action->name, actions_dir);
-		if (!action_dir)
-			goto fail;
 
 		/*
 		 * Create debugfs r/w file containing action->error. If
 		 * notifier call chain is called with action->val, it will
 		 * fail with the error code
 		 */
-		if (!debugfs_create_errno("error", mode, action_dir,
-					&action->error))
-			goto fail;
+		debugfs_create_errno("error", mode, action_dir, &action->error);
 	}
 	return dir;
-fail:
-	debugfs_remove_recursive(dir);
-	return ERR_PTR(-ENOMEM);
 }
 EXPORT_SYMBOL_GPL(notifier_err_inject_init);