X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=fs%2Fchar_dev.c;h=21195c481637658ad4e676ba35c204da83d53d57;hb=082a05c6f02e00982dd42ddae434fbc806a822e5;hp=7357a9127df1551066f4b07554e2ccddd598633e;hpb=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2;p=linux-2.6-omap-h63xx.git

diff --git a/fs/char_dev.c b/fs/char_dev.c
index 7357a9127df..21195c48163 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -26,8 +26,7 @@
 
 static struct kobj_map *cdev_map;
 
-/* degrade to linked list for small systems */
-#define MAX_PROBE_HASH (CONFIG_BASE_SMALL ? 1 : 255)
+#define MAX_PROBE_HASH 255	/* random */
 
 static DECLARE_MUTEX(chrdevs_lock);
 
@@ -36,7 +35,7 @@ static struct char_device_struct {
 	unsigned int major;
 	unsigned int baseminor;
 	int minorct;
-	const char *name;
+	char name[64];
 	struct file_operations *fops;
 	struct cdev *cdev;		/* will die */
 } *chrdevs[MAX_PROBE_HASH];
@@ -47,23 +46,84 @@ static inline int major_to_index(int major)
 	return major % MAX_PROBE_HASH;
 }
 
-/* get char device names in somewhat random order */
-int get_chrdev_list(char *page)
-{
+struct chrdev_info {
+	int index;
 	struct char_device_struct *cd;
-	int i, len;
+};
+
+void *get_next_chrdev(void *dev)
+{
+	struct chrdev_info *info;
+
+	if (dev == NULL) {
+		info = kmalloc(sizeof(*info), GFP_KERNEL);
+		if (!info)
+			goto out;
+		info->index=0;
+		info->cd = chrdevs[info->index];
+		if (info->cd)
+			goto out;
+	} else {
+		info = dev;
+	}
+
+	while (info->index < ARRAY_SIZE(chrdevs)) {
+		if (info->cd)
+			info->cd = info->cd->next;
+		if (info->cd)
+			goto out;
+		/*
+		 * No devices on this chain, move to the next
+		 */
+		info->index++;
+		info->cd = (info->index < ARRAY_SIZE(chrdevs)) ?
+			chrdevs[info->index] : NULL;
+		if (info->cd)
+			goto out;
+	}
 
-	len = sprintf(page, "Character devices:\n");
+out:
+	return info;
+}
 
+void *acquire_chrdev_list(void)
+{
 	down(&chrdevs_lock);
+	return get_next_chrdev(NULL);
+}
+
+void release_chrdev_list(void *dev)
+{
+	up(&chrdevs_lock);
+	kfree(dev);
+}
+
+
+int count_chrdev_list(void)
+{
+	struct char_device_struct *cd;
+	int i, count;
+
+	count = 0;
+
 	for (i = 0; i < ARRAY_SIZE(chrdevs) ; i++) {
 		for (cd = chrdevs[i]; cd; cd = cd->next)
-			len += sprintf(page+len, "%3d %s\n",
-				       cd->major, cd->name);
+			count++;
 	}
-	up(&chrdevs_lock);
 
-	return len;
+	return count;
+}
+
+int get_chrdev_info(void *dev, int *major, char **name)
+{
+	struct chrdev_info *info = dev;
+
+	if (info->cd == NULL)
+		return 1;
+
+	*major = info->cd->major;
+	*name = info->cd->name;
+	return 0;
 }
 
 /*
@@ -111,7 +171,7 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
 	cd->major = major;
 	cd->baseminor = baseminor;
 	cd->minorct = minorct;
-	cd->name = name;
+	strncpy(cd->name,name, 64);
 
 	i = major_to_index(major);
 
@@ -140,7 +200,7 @@ __unregister_chrdev_region(unsigned major, unsigned baseminor, int minorct)
 	struct char_device_struct *cd = NULL, **cp;
 	int i = major_to_index(major);
 
-	up(&chrdevs_lock);
+	down(&chrdevs_lock);
 	for (cp = &chrdevs[i]; *cp; cp = &(*cp)->next)
 		if ((*cp)->major == major &&
 		    (*cp)->baseminor == baseminor &&
@@ -267,8 +327,9 @@ static struct kobject *cdev_get(struct cdev *p)
 void cdev_put(struct cdev *p)
 {
 	if (p) {
+		struct module *owner = p->owner;
 		kobject_put(&p->kobj);
-		module_put(p->owner);
+		module_put(owner);
 	}
 }
 
@@ -329,7 +390,7 @@ void cd_forget(struct inode *inode)
 	spin_unlock(&cdev_lock);
 }
 
-void cdev_purge(struct cdev *cdev)
+static void cdev_purge(struct cdev *cdev)
 {
 	spin_lock(&cdev_lock);
 	while (!list_empty(&cdev->list)) {