[PATCH 2/6] scsi-mq: add operations about device_busy/target_busy/host_busy in scsi_mq_queue_rq().

[majianpeng]

To make the scsi-mq work, add those operations in scsi_mq_queue_rq().

Signed-off-by: Jianpeng Ma <majianp...@gmail.com>
---
 drivers/scsi/scsi-mq.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/scsi/scsi-mq.c b/drivers/scsi/scsi-mq.c
index 918b443..eccdbd5 100644
--- a/drivers/scsi/scsi-mq.c
+++ b/drivers/scsi/scsi-mq.c
@@ -20,8 +20,10 @@ static int scsi_mq_queue_rq(struct blk_mq_hw_ctx *hctx, 
struct request *rq)
        struct scsi_device *sdev = q->queuedata;
        struct scsi_cmnd *sc = rq->special;
        struct scatterlist *sg = sc->mq_sgl;
+       struct Scsi_Host *shost = sdev->host;
        unsigned char *sense_buf = sc->sense_buffer;
        int rc;
+
        /*
         * With blk-mq rq->special pre-allocation, scsi_get_cmd_from_req()
         * is using the hardware context *sc descriptor
@@ -66,6 +68,12 @@ static int scsi_mq_queue_rq(struct blk_mq_hw_ctx *hctx, 
struct request *rq)
        if (sdev->host->hostt->cmd_size)
                sc->SCp.ptr = blk_mq_rq_to_pdu(rq) + sizeof(struct scsi_cmnd);
 
+       spin_lock_irq(shost->host_lock);
+       sdev->device_busy++;
+       scsi_target(sdev)->target_busy++;
+       shost->host_busy++;
+       spin_unlock_irq(shost->host_lock);
+
        rc = scsi_dispatch_cmd(sc);
        switch (rc) {
        case 0:
-- 
1.7.10.4