[SCSI] modify change_queue_depth to take in reason why it is being called

This patch modifies scsi_host_template->change_queue_depth so that
it takes an argument indicating why it is being called. This will be
used so that if a LLD needs to do some extra processing when
handling queue fulls or later ramp ups, it can do so.

This is a simple port of the drivers setting a change_queue_depth
callback. In the patch I just have these LLDs adjust the queue depth
if the user was requesting it.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>

[Vasu.Dev: v2
	Also converted pmcraid_change_queue_depth and then verified
all modules compile  using "make allmodconfig" for any new build
warnings on X86_64.

	Updated original description after combing two original
patches from Mike to make this patch git bisectable.]
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
[jejb: fixed up 53c700]
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 8dc682f00fd2..55ee014a7e08 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -1099,11 +1099,12 @@ _scsih_build_scatter_gather(struct MPT2SAS_ADAPTER *ioc,
  * _scsih_change_queue_depth - setting device queue depth
  * @sdev: scsi device struct
  * @qdepth: requested queue depth
+ * @reason: calling context
  *
  * Returns queue depth.
  */
 static int
-_scsih_change_queue_depth(struct scsi_device *sdev, int qdepth)
+_scsih_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
 {
         struct Scsi_Host *shost = sdev->host;
         int max_depth;
@@ -1114,6 +1115,9 @@ _scsih_change_queue_depth(struct scsi_device *sdev, int qdepth)
         struct _sas_device *sas_device;
         unsigned long flags;
 
+        if (reason != SCSI_QDEPTH_DEFAULT)
+                return -EOPNOTSUPP;
+
         max_depth = shost->can_queue;
 
         /* limit max device queue for SATA to 32 */
@@ -1569,7 +1573,7 @@ _scsih_slave_configure(struct scsi_device *sdev)
                     r_level, raid_device->handle,
                     (unsigned long long)raid_device->wwid,
                     raid_device->num_pds, ds);
-                _scsih_change_queue_depth(sdev, qdepth);
+                _scsih_change_queue_depth(sdev, qdepth, SCSI_QDEPTH_DEFAULT);
                 return 0;
         }
 
@@ -1615,7 +1619,7 @@ _scsih_slave_configure(struct scsi_device *sdev)
                         _scsih_display_sata_capabilities(ioc, sas_device, sdev);
         }
 
-        _scsih_change_queue_depth(sdev, qdepth);
+        _scsih_change_queue_depth(sdev, qdepth, SCSI_QDEPTH_DEFAULT);
 
         if (ssp_target)
                 sas_read_port_mode_page(sdev);