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authorTejun Heo <tj@kernel.org>2013-02-27 17:03:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-27 19:10:15 -0800
commitbab998d62f12db12b3ddf1e06b2ecd4ed9e7ae45 (patch)
tree4fdd87842d72efb147ce12e513ccaccabebae4fb /block/genhd.c
parentce23bba842aee98092225d9576dba47c82352521 (diff)
downloadkernel-bab998d62f12db12b3ddf1e06b2ecd4ed9e7ae45.tar.gz
block: convert to idr_alloc()
Convert to the much saner new idr interface. Both bsg and genhd protect idr w/ mutex making preloading unnecessary. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c21
1 files changed, 6 insertions, 15 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 841b3037d866..3c001fba80c7 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;