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Subject[PATCH 29/61] driver core: get rid of struct device's bus_id string array
Date
From: Kay Sievers <kay.sievers@vrfy.org>

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>
---
drivers/base/core.c | 39 +++++++++++++++++++--------------------
include/linux/device.h | 4 +---
include/linux/kobject.h | 2 ++
lib/kobject.c | 2 +-
4 files changed, 23 insertions(+), 24 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index f3eae63..059966b 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 47f343c..d5706c4 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 5437ac0..c9c214d 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 0487d1f..a6dec32 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;
--
1.6.2


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