Merge "mtd: ubi: Free peb's synchronously for fastmap"

static void refill_wl_user_pool(struct ubi_device *ubi)

{

	struct ubi_fm_pool *pool = &ubi->fm_pool;

	int err;

	return_unused_pool_pebs(ubi, pool);

	for (pool->size = 0; pool->size < pool->max_size; pool->size++) {

retry:

		if (!ubi->free.rb_node ||

		   (ubi->free_count - ubi->beb_rsvd_pebs < 1)) {

			/* There are no avaliable pebs. Try to free

			 * PEB by means of synchronous execution of

			 * pending works.

			 */

			if (ubi->works_count == 0)

				break;

			spin_unlock(&ubi->wl_lock);

			err = do_work(ubi);

			spin_lock(&ubi->wl_lock);

			if (err < 0)

				break;

			goto retry;

		}

		pool->pebs[pool->size] = __wl_get_peb(ubi);

		if (pool->pebs[pool->size] < 0)

			break;