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kobject: fix up kobject_set_name to use kvasprintf

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Kay pointed out that kobject_set_name was being very stupid, doing two
allocations for every call, when it should just be using the kernel
function kvasprintf() instead.

This change adds the internal kobject_set_name_vargs() function, which
other follow-on patches will be using.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2007-11-29 18:32:47 -05:00
parent 15f2bbb28e
commit 663a47430b
1 changed files with 34 additions and 41 deletions
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75
lib/kobject.c
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@ -232,60 +232,53 @@ int kobject_register(struct kobject * kobj)
return error;
}
/**
* kobject_set_name - Set the name of a kobject
* @kobj: kobject to name
* kobject_set_name_vargs - Set the name of an kobject
* @kobj: struct kobject to set the name of
* @fmt: format string used to build the name
*
* This sets the name of the kobject. If you have already added the
* kobject to the system, you must call kobject_rename() in order to
* change the name of the kobject.
* @vargs: vargs to format the string.
*/
int kobject_set_name(struct kobject * kobj, const char * fmt, ...)
static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
va_list vargs)
{
int error = 0;
int limit;
int need;
va_list args;
va_list aq;
char *name;
/* find out how big a buffer we need */
name = kmalloc(1024, GFP_KERNEL);
if (!name) {
error = -ENOMEM;
goto done;
}
va_start(args, fmt);
need = vsnprintf(name, 1024, fmt, args);
va_end(args);
kfree(name);
va_copy(aq, vargs);
name = kvasprintf(GFP_KERNEL, fmt, vargs);
va_end(aq);
/* Allocate the new space and copy the string in */
limit = need + 1;
name = kmalloc(limit, GFP_KERNEL);
if (!name) {
error = -ENOMEM;
goto done;
}
va_start(args, fmt);
need = vsnprintf(name, limit, fmt, args);
va_end(args);
/* something wrong with the string we copied? */
if (need >= limit) {
kfree(name);
error = -EFAULT;
goto done;
}
if (!name)
return -ENOMEM;
/* Free the old name, if necessary. */
kfree(kobj->k_name);
/* Now, set the new name */
kobj->k_name = name;
done:
return error;
return 0;
}
/**
* kobject_set_name - Set the name of a kobject
* @kobj: struct kobject to set the name of
* @fmt: format string used to build the name
*
* This sets the name of the kobject. If you have already added the
* kobject to the system, you must call kobject_rename() in order to
* change the name of the kobject.
*/
int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
{
va_list args;
int retval;
va_start(args, fmt);
retval = kobject_set_name_vargs(kobj, fmt, args);
va_end(args);
return retval;
}
EXPORT_SYMBOL(kobject_set_name);