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block: make blk_lookup_devt use the class iterator function

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Use the proper class iterator function instead of mucking around in the
internals of the class structures.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2008-05-22 17:21:08 -04:00
parent 5c6f35c5ec
commit a142be856f
1 changed files with 26 additions and 12 deletions
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38
block/genhd.c
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@ -677,24 +677,38 @@ void genhd_media_change_notify(struct gendisk *disk)
EXPORT_SYMBOL_GPL(genhd_media_change_notify);
#endif /* 0 */
struct find_block {
const char *name;
int part;
};
static int match_id(struct device *dev, void *data)
{
struct find_block *find = data;
if (dev->type != &disk_type)
return 0;
if (strcmp(dev->bus_id, find->name) == 0) {
struct gendisk *disk = dev_to_disk(dev);
if (find->part < disk->minors)
return 1;
}
return 0;
}
dev_t blk_lookup_devt(const char *name, int part)
{
struct device *dev;
dev_t devt = MKDEV(0, 0);
struct find_block find;
mutex_lock(&block_class_lock);
list_for_each_entry(dev, &block_class.devices, node) {
if (dev->type != &disk_type)
continue;
if (strcmp(dev->bus_id, name) == 0) {
struct gendisk *disk = dev_to_disk(dev);
if (part < disk->minors)
devt = MKDEV(MAJOR(dev->devt),
MINOR(dev->devt) + part);
break;
}
}
find.name = name;
find.part = part;
dev = class_find_device(&block_class, NULL, (void *)&find, match_id);
if (dev)
devt = MKDEV(MAJOR(dev->devt),
MINOR(dev->devt) + part);
mutex_unlock(&block_class_lock);
return devt;