struct kobject *block_depr;
/* for extended dynamic devt allocation, currently only one major is used */
-#define MAX_EXT_DEVT (1 << MINORBITS)
+#define NR_EXT_DEVT (1 << MINORBITS)
/* For extended devt allocation. ext_devt_mutex prevents look up
* results from going away underneath its user.
int blk_alloc_devt(struct hd_struct *part, dev_t *devt)
{
struct gendisk *disk = part_to_disk(part);
- int idx, rc;
+ int idx;
/* in consecutive minor range? */
if (part->partno < disk->minors) {
}
/* allocate ext devt */
- do {
- if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL))
- return -ENOMEM;
- mutex_lock(&ext_devt_mutex);
- rc = idr_get_new(&ext_devt_idr, part, &idx);
- mutex_unlock(&ext_devt_mutex);
- } while (rc == -EAGAIN);
-
- if (rc)
- return rc;
-
- if (idx > MAX_EXT_DEVT) {
- mutex_lock(&ext_devt_mutex);
- idr_remove(&ext_devt_idr, idx);
- mutex_unlock(&ext_devt_mutex);
- return -EBUSY;
- }
+ mutex_lock(&ext_devt_mutex);
+ idx = idr_alloc(&ext_devt_idr, part, 0, NR_EXT_DEVT, GFP_KERNEL);
+ mutex_unlock(&ext_devt_mutex);
+ if (idx < 0)
+ return idx == -ENOSPC ? -EBUSY : idx;
*devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx));
return 0;