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-rw-r--r--block/genhd.c21
1 files changed, 6 insertions, 15 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 841b303..3c001fba 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -411,7 +411,7 @@ static int blk_mangle_minor(int minor)
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) {
@@ -420,20 +420,11 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt)
}
/* 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);
- if (!rc && idx >= NR_EXT_DEVT) {
- idr_remove(&ext_devt_idr, idx);
- rc = -EBUSY;
- }
- mutex_unlock(&ext_devt_mutex);
- } while (rc == -EAGAIN);
-
- if (rc)
- return rc;
+ 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;
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