[PATCH 09/10] scsi: add scsi_device_busy() to read sdev->device_busy

[Ming Lei <ming.lei@redhat.com>]

Add scsi_device_busy() for drivers, so that we can prepare for tracking
device queue depth via sbitmap_queue.

Cc: Omar Sandoval <osandov@fb.com>
Cc: Sathya Prakash <sathya.prakash@broadcom.com>
Cc: Chaitra P B <chaitra.basappa@broadcom.com>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumit Saxena <sumit.saxena@broadcom.com>
Cc: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Cc: Ewan D. Milne <emilne@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 2 +-
 drivers/scsi/scsi_lib.c              | 4 ++--
 drivers/scsi/scsi_sysfs.c            | 2 +-
 drivers/scsi/sg.c                    | 2 +-
 include/scsi/scsi_device.h           | 5 +++++
 5 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index c597d544eb39..6685ec041c38 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -3060,7 +3060,7 @@ scsih_dev_reset(struct scsi_cmnd *scmd)
 		MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET, 0, 0,
 		tr_timeout, tr_method);
 	/* Check for busy commands after reset */
-	if (r == SUCCESS && atomic_read(&scmd->device->device_busy))
+	if (r == SUCCESS && scsi_device_busy(scmd->device))
 		r = FAILED;
  out:
 	sdev_printk(KERN_INFO, scmd->device, "device reset: %s scmd(0x%p)\n",
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index c8eb555b3ce8..a3474b418602 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -410,7 +410,7 @@ static void scsi_single_lun_run(struct scsi_device *current_sdev)
 
 static inline bool scsi_device_is_busy(struct scsi_device *sdev)
 {
-	if (atomic_read(&sdev->device_busy) >= sdev->queue_depth)
+	if (scsi_device_busy(sdev) >= sdev->queue_depth)
 		return true;
 	if (atomic_read(&sdev->device_blocked) > 0)
 		return true;
@@ -1635,7 +1635,7 @@ static int scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx)
 	if (scsi_dev_queue_ready(q, sdev))
 		return 0;
 
-	if (atomic_read(&sdev->device_busy) == 0 && !scsi_device_blocked(sdev))
+	if (scsi_device_busy(sdev) == 0 && !scsi_device_blocked(sdev))
 		blk_mq_delay_run_hw_queue(hctx, SCSI_QUEUE_DELAY);
 	return -1;
 }
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 677b5c5403d2..d6cb5a0a03f2 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -659,7 +659,7 @@ sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 		char *buf)
 {
 	struct scsi_device *sdev = to_scsi_device(dev);
-	return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
+	return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 }
 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 4e6af592f018..943a18256881 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -2507,7 +2507,7 @@ static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
 			      scsidp->id, scsidp->lun, (int) scsidp->type,
 			      1,
 			      (int) scsidp->queue_depth,
-			      (int) atomic_read(&scsidp->device_busy),
+			      (int) scsi_device_busy(scsidp),
 			      (int) scsi_device_online(scsidp));
 	}
 	read_unlock_irqrestore(&sg_index_lock, iflags);
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index f8312a3e5b42..09caf6f2f528 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -584,6 +584,11 @@ static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 	return 0;
 }
 
+static inline int scsi_device_busy(struct scsi_device *sdev)
+{
+	return atomic_read(&sdev->device_busy);
+}
+
 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 	MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
-- 
2.20.1