diff options
| author | Tejun Heo <tj@kernel.org> | 2014-09-08 08:03:56 +0900 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-09-13 13:35:23 +0200 |
| commit | 68b47ca59d3cd76a825984b49c283cf5b39b220a (patch) | |
| tree | 133e40f26aeadd5ca0c541a7abceeb39a96cb7c6 /include/linux | |
| parent | 2679d033a9192f766a82e75b2b3b4226a9e90484 (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>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/blkdev.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 19d64d2ad..93a08def8 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -890,7 +890,7 @@ extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, static inline struct request_queue *bdev_get_queue(struct block_device *bdev) { - return bdev->bd_disk->queue; + return bdev->bd_disk->queue; /* this is never NULL */ } /* |