From: Tejun Heo Date: Sun, 7 Sep 2014 23:03:56 +0000 (+0900) Subject: block, bdi: an active gendisk always has a request_queue associated with it X-Git-Tag: fixes-against-v3.18-rc2~52^2~20 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff9ea323816dc1c8ac7144afd4eab3ac97704430;p=pandora-kernel.git 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 Cc: Chris Mason Cc: Dave Chinner Signed-off-by: Jens Axboe --- Reading git-diff-tree failed