From 86072d8112595ea1b6beeb33f578e7c2839e014e Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 4 Jun 2012 20:40:54 -0700 Subject: block: drop custom queue draining used by scsi_transport_{iscsi|fc} iscsi_remove_host() uses bsg_remove_queue() which implements custom queue draining. fc_bsg_remove() open-codes mostly identical logic. The draining logic isn't correct in that blk_stop_queue() doesn't prevent new requests from being queued - it just stops processing, so nothing prevents new requests to be queued after the logic determines that the queue is drained. blk_cleanup_queue() now implements proper queue draining and these custom draining logics aren't necessary. Drop them and use bsg_unregister_queue() + blk_cleanup_queue() instead. Signed-off-by: Tejun Heo Reviewed-by: Mike Christie Acked-by: Vivek Goyal Cc: James Bottomley Cc: James Smart Signed-off-by: Jens Axboe --- drivers/scsi/scsi_transport_fc.c | 38 ------------------------------------- drivers/scsi/scsi_transport_iscsi.c | 2 +- 2 files changed, 1 insertion(+), 39 deletions(-) (limited to 'drivers') diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index 579760420d53..a9617ad05f33 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -4130,45 +4130,7 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport) static void fc_bsg_remove(struct request_queue *q) { - struct request *req; /* block request */ - int counts; /* totals for request_list count and starved */ - if (q) { - /* Stop taking in new requests */ - spin_lock_irq(q->queue_lock); - blk_stop_queue(q); - - /* drain all requests in the queue */ - while (1) { - /* need the lock to fetch a request - * this may fetch the same reqeust as the previous pass - */ - req = blk_fetch_request(q); - /* save requests in use and starved */ - counts = q->rq.count[0] + q->rq.count[1] + - q->rq.starved[0] + q->rq.starved[1]; - spin_unlock_irq(q->queue_lock); - /* any requests still outstanding? */ - if (counts == 0) - break; - - /* This may be the same req as the previous iteration, - * always send the blk_end_request_all after a prefetch. - * It is not okay to not end the request because the - * prefetch started the request. - */ - if (req) { - /* return -ENXIO to indicate that this queue is - * going away - */ - req->errors = -ENXIO; - blk_end_request_all(req, -ENXIO); - } - - msleep(200); /* allow bsg to possibly finish */ - spin_lock_irq(q->queue_lock); - } - bsg_unregister_queue(q); blk_cleanup_queue(q); } diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 1cf640e575da..c737a16b0a1d 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -575,7 +575,7 @@ static int iscsi_remove_host(struct transport_container *tc, struct iscsi_cls_host *ihost = shost->shost_data; if (ihost->bsg_q) { - bsg_remove_queue(ihost->bsg_q); + bsg_unregister_queue(ihost->bsg_q); blk_cleanup_queue(ihost->bsg_q); } return 0; -- cgit v1.2.3