Merge tag 'configfs-5.10' of git://git.infradead.org/users/hch/configfs

Pull configfs updates from Christoph Hellwig:
 "Various cleanups for the configfs samples (Bartosz Golaszewski)"

* tag 'configfs-5.10' of git://git.infradead.org/users/hch/configfs:
  samples: configfs: prefer pr_err() over bare printk(KERN_ERR
  samples: configfs: don't use spaces before tabs
  samples: configfs: consolidate local variables of the same type
  samples: configfs: don't reinitialize variables which are already zeroed
  samples: configfs: replace simple_strtoul() with kstrtoint()
  samples: configfs: fix alignment in item struct
  samples: configfs: drop unnecessary ternary operators
  samples: configfs: remove redundant newlines
  MAINTAINERS: add the sample directory to the configfs entry

MAINTAINERS

@@ -4415,6 +4415,7 @@ S:	Supported
 T:	git git://git.infradead.org/users/hch/configfs.git
 F:	fs/configfs/
 F:	include/linux/configfs.h
+F:	samples/configfs/
 
 CONSOLE SUBSYSTEM
 M:	Greg Kroah-Hartman <gregkh@linuxfoundation.org>

samples/configfs/configfs_sample.c

@@ -13,13 +13,11 @@
  */
 
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-
 #include <linux/configfs.h>
 
-
-
 /*
  * 01-childless
  *
@@ -40,8 +38,8 @@ struct childless {
 
 static inline struct childless *to_childless(struct config_item *item)
 {
-	return item ? container_of(to_configfs_subsystem(to_config_group(item)),
-			struct childless, subsys) : NULL;
+	return container_of(to_configfs_subsystem(to_config_group(item)),
+			    struct childless, subsys);
 }
 
 static ssize_t childless_showme_show(struct config_item *item, char *page)
@@ -64,17 +62,11 @@ static ssize_t childless_storeme_store(struct config_item *item,
 		const char *page, size_t count)
 {
 	struct childless *childless = to_childless(item);
-	unsigned long tmp;
-	char *p = (char *) page;
-
-	tmp = simple_strtoul(p, &p, 10);
-	if (!p || (*p && (*p != '\n')))
-		return -EINVAL;
-
-	if (tmp > INT_MAX)
-		return -ERANGE;
+	int ret;
 
-	childless->storeme = tmp;
+	ret = kstrtoint(page, 10, &childless->storeme);
+	if (ret)
+		return ret;
 
 	return count;
 }
@@ -117,7 +109,6 @@ static struct childless childless_subsys = {
 	},
 };
 
-
 /* ----------------------------------------------------------------- */
 
 /*
@@ -136,7 +127,7 @@ struct simple_child {
 
 static inline struct simple_child *to_simple_child(struct config_item *item)
 {
-	return item ? container_of(item, struct simple_child, item) : NULL;
+	return container_of(item, struct simple_child, item);
 }
 
 static ssize_t simple_child_storeme_show(struct config_item *item, char *page)
@@ -148,17 +139,11 @@ static ssize_t simple_child_storeme_store(struct config_item *item,
 		const char *page, size_t count)
 {
 	struct simple_child *simple_child = to_simple_child(item);
-	unsigned long tmp;
-	char *p = (char *) page;
-
-	tmp = simple_strtoul(p, &p, 10);
-	if (!p || (*p && (*p != '\n')))
-		return -EINVAL;
-
-	if (tmp > INT_MAX)
-		return -ERANGE;
+	int ret;
 
-	simple_child->storeme = tmp;
+	ret = kstrtoint(page, 10, &simple_child->storeme);
+	if (ret)
+		return ret;
 
 	return count;
 }
@@ -185,15 +170,14 @@ static const struct config_item_type simple_child_type = {
 	.ct_owner	= THIS_MODULE,
 };
 
-
 struct simple_children {
 	struct config_group group;
 };
 
 static inline struct simple_children *to_simple_children(struct config_item *item)
 {
-	return item ? container_of(to_config_group(item),
-			struct simple_children, group) : NULL;
+	return container_of(to_config_group(item),
+			    struct simple_children, group);
 }
 
 static struct config_item *simple_children_make_item(struct config_group *group,
@@ -208,8 +192,6 @@ static struct config_item *simple_children_make_item(struct config_group *group,
 	config_item_init_type_name(&simple_child->item, name,
 				   &simple_child_type);
 
-	simple_child->storeme = 0;
-
 	return &simple_child->item;
 }
 
@@ -263,7 +245,6 @@ static struct configfs_subsystem simple_children_subsys = {
 	},
 };
 
-
 /* ----------------------------------------------------------------- */
 
 /*
@@ -350,9 +331,8 @@ static struct configfs_subsystem *example_subsys[] = {
 
 static int __init configfs_example_init(void)
 {
-	int ret;
-	int i;
 	struct configfs_subsystem *subsys;
+	int ret, i;
 
 	for (i = 0; example_subsys[i]; i++) {
 		subsys = example_subsys[i];
@@ -361,9 +341,8 @@ static int __init configfs_example_init(void)
 		mutex_init(&subsys->su_mutex);
 		ret = configfs_register_subsystem(subsys);
 		if (ret) {
-			printk(KERN_ERR "Error %d while registering subsystem %s\n",
-			       ret,
-			       subsys->su_group.cg_item.ci_namebuf);
+			pr_err("Error %d while registering subsystem %s\n",
+			       ret, subsys->su_group.cg_item.ci_namebuf);
 			goto out_unregister;
 		}
 	}