diff options
| -rw-r--r-- | block/blk-core.c | 11 | ||||
| -rw-r--r-- | block/blk.h | 1 | ||||
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 17 | ||||
| -rw-r--r-- | drivers/scsi/scsi_transport_fc.c | 19 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 26 |
5 files changed, 20 insertions, 54 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 580eee5743e..40725b9091f 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -303,15 +303,7 @@ void __blk_run_queue(struct request_queue *q) if (unlikely(blk_queue_stopped(q))) return; - /* - * Only recurse once to avoid overrunning the stack, let the unplug - * handling reinvoke the handler shortly if we already got there. - */ - if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) { - q->request_fn(q); - queue_flag_clear(QUEUE_FLAG_REENTER, q); - } else - queue_delayed_work(kblockd_workqueue, &q->delay_work, 0); + q->request_fn(q); } EXPORT_SYMBOL(__blk_run_queue); @@ -328,6 +320,7 @@ void blk_run_queue_async(struct request_queue *q) if (likely(!blk_queue_stopped(q))) queue_delayed_work(kblockd_workqueue, &q->delay_work, 0); } +EXPORT_SYMBOL(blk_run_queue_async); /** * blk_run_queue - run a single device queue diff --git a/block/blk.h b/block/blk.h index c9df8fc3c99..61263463e38 100644 --- a/block/blk.h +++ b/block/blk.h @@ -22,7 +22,6 @@ void blk_rq_timed_out_timer(unsigned long data); void blk_delete_timer(struct request *); void blk_add_timer(struct request *); void __generic_unplug_device(struct request_queue *); -void blk_run_queue_async(struct request_queue *q); /* * Internal atomic flags for request handling diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index ab55c2fa7ce..e9901b8f844 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -411,8 +411,6 @@ static void scsi_run_queue(struct request_queue *q) list_splice_init(&shost->starved_list, &starved_list); while (!list_empty(&starved_list)) { - int flagset; - /* * As long as shost is accepting commands and we have * starved queues, call blk_run_queue. scsi_request_fn @@ -435,20 +433,7 @@ static void scsi_run_queue(struct request_queue *q) continue; } - spin_unlock(shost->host_lock); - - spin_lock(sdev->request_queue->queue_lock); - flagset = test_bit(QUEUE_FLAG_REENTER, &q->queue_flags) && - !test_bit(QUEUE_FLAG_REENTER, - &sdev->request_queue->queue_flags); - if (flagset) - queue_flag_set(QUEUE_FLAG_REENTER, sdev->request_queue); - __blk_run_queue(sdev->request_queue); - if (flagset) - queue_flag_clear(QUEUE_FLAG_REENTER, sdev->request_queue); - spin_unlock(sdev->request_queue->queue_lock); - - spin_lock(shost->host_lock); + blk_run_queue_async(sdev->request_queue); } /* put any unprocessed entries back */ list_splice(&starved_list, &shost->starved_list); diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index 28c33506e4a..815069d13f9 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -3816,28 +3816,17 @@ fail_host_msg: static void fc_bsg_goose_queue(struct fc_rport *rport) { - int flagset; - unsigned long flags; - if (!rport->rqst_q) return; + /* + * This get/put dance makes no sense + */ get_device(&rport->dev); - - spin_lock_irqsave(rport->rqst_q->queue_lock, flags); - flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) && - !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags); - if (flagset) - queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q); - __blk_run_queue(rport->rqst_q); - if (flagset) - queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q); - spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags); - + blk_run_queue_async(rport->rqst_q); put_device(&rport->dev); } - /** * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD * @q: rport request queue diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index cbbfd98ad4a..2ad95fa1d13 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -388,20 +388,19 @@ struct request_queue #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ -#define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ -#define QUEUE_FLAG_ELVSWITCH 7 /* don't use elevator, just do FIFO */ -#define QUEUE_FLAG_BIDI 8 /* queue supports bidi requests */ -#define QUEUE_FLAG_NOMERGES 9 /* disable merge attempts */ -#define QUEUE_FLAG_SAME_COMP 10 /* force complete on same CPU */ -#define QUEUE_FLAG_FAIL_IO 11 /* fake timeout */ -#define QUEUE_FLAG_STACKABLE 12 /* supports request stacking */ -#define QUEUE_FLAG_NONROT 13 /* non-rotational device (SSD) */ +#define QUEUE_FLAG_ELVSWITCH 6 /* don't use elevator, just do FIFO */ +#define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ +#define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ +#define QUEUE_FLAG_SAME_COMP 9 /* force complete on same CPU */ +#define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ +#define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ +#define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ -#define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ -#define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ -#define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ -#define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ -#define QUEUE_FLAG_SECDISCARD 19 /* supports SECDISCARD */ +#define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ +#define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ +#define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ +#define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ +#define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_STACKABLE) | \ @@ -699,6 +698,7 @@ extern void blk_sync_queue(struct request_queue *q); extern void __blk_stop_queue(struct request_queue *q); extern void __blk_run_queue(struct request_queue *q); extern void blk_run_queue(struct request_queue *); +extern void blk_run_queue_async(struct request_queue *q); extern int blk_rq_map_user(struct request_queue *, struct request *, struct rq_map_data *, void __user *, unsigned long, gfp_t); |