driver core: get rid of struct device's bus_id string array

Now that all users of bus_id is gone, we can remove it from struct
device.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 23 insertions, 24 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index f3eae630e589..059966b617f6 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -777,17 +777,12 @@ static void device_remove_class_symlinks(struct device *dev)
 int dev_set_name(struct device *dev, const char *fmt, ...)
 {
         va_list vargs;
-        char *s;
+        int err;
 
         va_start(vargs, fmt);
-        vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs);
+        err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
         va_end(vargs);
-
-        /* ewww... some of these buggers have / in the name... */
-        while ((s = strchr(dev->bus_id, '/')))
-                *s = '!';
-
-        return 0;
+        return err;
 }
 EXPORT_SYMBOL_GPL(dev_set_name);
 
@@ -864,12 +859,17 @@ int device_add(struct device *dev)
         if (!dev)
                 goto done;
 
-        /* Temporarily support init_name if it is set.
-         * It will override bus_id for now */
-        if (dev->init_name)
-                dev_set_name(dev, "%s", dev->init_name);
+        /*
+         * for statically allocated devices, which should all be converted
+         * some day, we need to initialize the name. We prevent reading back
+         * the name, and force the use of dev_name()
+         */
+        if (dev->init_name) {
+                dev_set_name(dev, dev->init_name);
+                dev->init_name = NULL;
+        }
 
-        if (!strlen(dev->bus_id))
+        if (!dev_name(dev))
                 goto done;
 
         pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
@@ -1348,7 +1348,10 @@ struct device *device_create_vargs(struct class *class, struct device *parent,
         dev->release = device_create_release;
         dev_set_drvdata(dev, drvdata);
 
-        vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
+        retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
+        if (retval)
+                goto error;
+
         retval = device_register(dev);
         if (retval)
                 goto error;
@@ -1452,19 +1455,15 @@ int device_rename(struct device *dev, char *new_name)
                 old_class_name = make_class_name(dev->class->name, &dev->kobj);
 #endif
 
-        old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
+        old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
         if (!old_device_name) {
                 error = -ENOMEM;
                 goto out;
         }
-        strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE);
-        strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
 
         error = kobject_rename(&dev->kobj, new_name);
-        if (error) {
-                strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE);
+        if (error)
                 goto out;
-        }
 
 #ifdef CONFIG_SYSFS_DEPRECATED
         if (old_class_name) {
diff --git a/include/linux/device.h b/include/linux/device.h
index 47f343c7bdda..d5706c448bcb 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -374,7 +374,6 @@ struct device {
         struct device           *parent;
 
         struct kobject kobj;
-        char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
         unsigned                uevent_suppress:1;
         const char              *init_name; /* initial name of the device */
         struct device_type      *type;
@@ -427,8 +426,7 @@ struct device {
 
 static inline const char *dev_name(const struct device *dev)
 {
-        /* will be changed into kobject_name(&dev->kobj) in the near future */
-        return dev->bus_id;
+        return kobject_name(&dev->kobj);
 }
 
 extern int dev_set_name(struct device *dev, const char *name, ...)
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 5437ac0276e2..c9c214d7bba2 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -72,6 +72,8 @@ struct kobject {
 
 extern int kobject_set_name(struct kobject *kobj, const char *name, ...)
                             __attribute__((format(printf, 2, 3)));
+extern int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
+                                  va_list vargs);
 
 static inline const char *kobject_name(const struct kobject *kobj)
 {
diff --git a/lib/kobject.c b/lib/kobject.c
index 0487d1f64806..a6dec32f2ddd 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -212,7 +212,7 @@ static int kobject_add_internal(struct kobject *kobj)
  * @fmt: format string used to build the name
  * @vargs: vargs to format the string.
  */
-static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
+int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
                                   va_list vargs)
 {
         const char *old_name = kobj->name;