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bsg: update check for rq based driver for blk-mq 

bsg currently checks ->request_fn to check whether a queue can
handle struct request. But with blk-mq, we don't have a request_fn
yet are request based. Add a queue_is_rq_based() helper and use
that in bsg, I'm guessing this is not the last place we need to
update for this. Besides, it better explains what is being
checked.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2014-04-16 10:57:18 -06:00
parent fb1be43301
commit 49fd524f95
2 changed files with 10 additions and 1 deletions
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2
block/bsg.c
View File

@ -1008,7 +1008,7 @@ int bsg_register_queue(struct request_queue *q, struct device *parent,
/*
* we need a proper transport to send commands, not a stacked device
*/
if (!q->request_fn)
if (!queue_is_rq_based(q))
return 0;
bcd = &q->bsg_dev;

9
include/linux/blkdev.h
View File

@ -612,6 +612,15 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
#define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0)
/*
* Driver can handle struct request, if it either has an old style
* request_fn defined, or is blk-mq based.
*/
static inline bool queue_is_rq_based(struct request_queue *q)
{
return q->request_fn || q->mq_ops;
}
static inline unsigned int blk_queue_cluster(struct request_queue *q)
{
return q->limits.cluster;