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authorTejun Heo <tj@kernel.org>2014-09-08 08:03:56 +0900
committerJens Axboe <axboe@fb.com>2014-09-08 10:00:35 -0600
commitff9ea323816dc1c8ac7144afd4eab3ac97704430 (patch)
treea865fe69407f8c15d4d877defbc801aebf8d1849 /fs/xfs/xfs_buf.c
parentf4da80727cfbc3590d95ff17ef8db96e6f1483a4 (diff)
block, bdi: an active gendisk always has a request_queue associated with it
bdev_get_queue() returns the request_queue associated with the specified block_device. blk_get_backing_dev_info() makes use of bdev_get_queue() to determine the associated bdi given a block_device. All the callers of bdev_get_queue() including blk_get_backing_dev_info() assume that bdev_get_queue() may return NULL and implement NULL handling; however, bdev_get_queue() requires the passed in block_device is opened and attached to its gendisk. Because an active gendisk always has a valid request_queue associated with it, bdev_get_queue() can never return NULL and neither can blk_get_backing_dev_info(). Make it clear that neither of the two functions can return NULL and remove NULL handling from all the callers. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Chris Mason <clm@fb.com> Cc: Dave Chinner <david@fromorbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/xfs/xfs_buf.c')
-rw-r--r--fs/xfs/xfs_buf.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index cd7b8ca9b064..497fcde381d7 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1678,8 +1678,6 @@ xfs_alloc_buftarg(
btp->bt_dev = bdev->bd_dev;
btp->bt_bdev = bdev;
btp->bt_bdi = blk_get_backing_dev_info(bdev);
- if (!btp->bt_bdi)
- goto error;
if (xfs_setsize_buftarg_early(btp, bdev))
goto error;