The Notes section of the comment was removed, because now blk_release_queue can only be executed from blk_cleanup_queue (being called when the q->kobj reaches zero), and also blk_init_queue was removed in a1ce35fa4985. Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@xxxxxxxxx> --- This is basically a v2 of https://lkml.org/lkml/2019/1/14/1098 But, I tried to describe when this function is called, removing redundancies. Maybe it would be better placed in blk-core.c, where the q->kobj is initialized with blk_queue_ktype (which .release pointer points to blk_release_queue)? block/blk-sysfs.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 590d1ef2f961..d4dea9179fa6 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -817,21 +817,16 @@ static void blk_free_queue_rcu(struct rcu_head *rcu_head) } /** - * __blk_release_queue - release a request queue when it is no longer needed + * __blk_release_queue - release a request queue * @work: pointer to the release_work member of the request queue to be released * * Description: - * blk_release_queue is the counterpart of blk_init_queue(). It should be - * called when a request queue is being released; typically when a block - * device is being de-registered. Its primary task it to free the queue - * itself. - * - * Notes: - * The low level driver must have finished any outstanding requests first - * via blk_cleanup_queue(). - * - * Although blk_release_queue() may be called with preemption disabled, - * __blk_release_queue() may sleep. + * This function is called when a block device is being de-registered. The + * process of releasing a request queue starts with blk_cleanup_queue, which + * set the appropriate flags and the calls blk_put_queue, that decrements + * the reference counter of the request queue. Once the reference counter + * of the request queue reaches zero, blk_release_queue is called to release + * all allocated resources of the request queue. */ static void __blk_release_queue(struct work_struct *work) { -- 2.16.4
