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authorChristoph Hellwig <hch@lst.de>2014-11-03 22:15:14 +0300
committerChristoph Hellwig <hch@lst.de>2014-11-12 13:19:43 +0300
commitc8b09f6fb67df7fc1b51ced1037fa9b677428149 (patch)
tree87527c3e17a7539c0ffa9f64fbd85ec2ad3dabf1 /drivers/scsi/libsas
parent2ecb204d07ac8debe3893c362415919bc78bebd6 (diff)
downloadlinux-c8b09f6fb67df7fc1b51ced1037fa9b677428149.tar.xz
scsi: don't set tagging state from scsi_adjust_queue_depth
Remove the tagged argument from scsi_adjust_queue_depth, and just let it handle the queue depth. For most drivers those two are fairly separate, given that most modern drivers don't care about the SCSI "tagged" status of a command at all, and many old drivers allow queuing of multiple untagged commands in the driver. Instead we start out with the ->simple_tags flag set before calling ->slave_configure, which is how all drivers actually looking at ->simple_tags except for one worke anyway. The one other case looks broken, but I've kept the behavior as-is for now. Except for that we only change ->simple_tags from the ->change_queue_type, and when rejecting a tag message in a single driver, so keeping this churn out of scsi_adjust_queue_depth is a clear win. Now that the usage of scsi_adjust_queue_depth is more obvious we can also remove all the trivial instances in ->slave_alloc or ->slave_configure that just set it to the cmd_per_lun default. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/libsas')
-rw-r--r--drivers/scsi/libsas/sas_scsi_host.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index eee21a060d93..56d698af073d 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -940,13 +940,13 @@ int sas_slave_configure(struct scsi_device *scsi_dev)
sas_read_port_mode_page(scsi_dev);
if (scsi_dev->tagged_supported) {
- scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG, SAS_DEF_QD);
+ scsi_adjust_queue_depth(scsi_dev, SAS_DEF_QD);
} else {
SAS_DPRINTK("device %llx, LUN %llx doesn't support "
"TCQ\n", SAS_ADDR(dev->sas_addr),
scsi_dev->lun);
scsi_dev->tagged_supported = 0;
- scsi_adjust_queue_depth(scsi_dev, 0, 1);
+ scsi_adjust_queue_depth(scsi_dev, 1);
}
scsi_dev->allow_restart = 1;
@@ -967,7 +967,7 @@ int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
case SCSI_QDEPTH_RAMP_UP:
if (!sdev->tagged_supported)
depth = 1;
- scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+ scsi_adjust_queue_depth(sdev, depth);
break;
case SCSI_QDEPTH_QFULL:
scsi_track_queue_full(sdev, depth);
@@ -979,19 +979,11 @@ int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
return depth;
}
-int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
+int sas_change_queue_type(struct scsi_device *scsi_dev, int type)
{
- struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
-
- if (dev_is_sata(dev))
+ if (dev_is_sata(sdev_to_domain_dev(scsi_dev)))
return -EINVAL;
-
- if (!scsi_dev->tagged_supported)
- return 0;
-
- scsi_adjust_queue_depth(scsi_dev, qt, scsi_dev->queue_depth);
-
- return qt;
+ return scsi_change_queue_type(scsi_dev, type);
}
int sas_bios_param(struct scsi_device *scsi_dev,