X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=block%2Fgenhd.c;h=3631cd4802955247d27316c10b172744700e6340;hb=a3902ee98304324f681088203391b5c0353ce977;hp=d9ccd42f36756358e6f7e5c0219e916bc08c0d6b;hpb=dc3b17cc8bf21307c7e076e7c778d5db756f7871;p=platform%2Fkernel%2Flinux-rpi.git

diff --git a/block/genhd.c b/block/genhd.c
index d9ccd42..3631cd4 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -572,6 +572,20 @@ exit:
 	disk_part_iter_exit(&piter);
 }
 
+void put_disk_devt(struct disk_devt *disk_devt)
+{
+	if (disk_devt && atomic_dec_and_test(&disk_devt->count))
+		disk_devt->release(disk_devt);
+}
+EXPORT_SYMBOL(put_disk_devt);
+
+void get_disk_devt(struct disk_devt *disk_devt)
+{
+	if (disk_devt)
+		atomic_inc(&disk_devt->count);
+}
+EXPORT_SYMBOL(get_disk_devt);
+
 /**
  * device_add_disk - add partitioning information to kernel list
  * @parent: parent device for the disk
@@ -612,6 +626,13 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
 
 	disk_alloc_events(disk);
 
+	/*
+	 * Take a reference on the devt and assign it to queue since it
+	 * must not be reallocated while the bdi is registered
+	 */
+	disk->queue->disk_devt = disk->disk_devt;
+	get_disk_devt(disk->disk_devt);
+
 	/* Register BDI before referencing it from bdev */
 	bdi = disk->queue->backing_dev_info;
 	bdi_register_owner(bdi, disk_to_dev(disk));