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-rw-r--r--block/genhd.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/block/genhd.c b/block/genhd.c
index cd65b97e84d4..841b3037d866 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -26,7 +26,7 @@ static DEFINE_MUTEX(block_class_lock);
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.
@@ -425,19 +425,16 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt)
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;
- if (idx > MAX_EXT_DEVT) {
- mutex_lock(&ext_devt_mutex);
- idr_remove(&ext_devt_idr, idx);
- mutex_unlock(&ext_devt_mutex);
- return -EBUSY;
- }
-
*devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx));
return 0;
}