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authorMike Christie <michaelc@cs.wisc.edu>2009-11-12 01:34:36 +0300
committerJames Bottomley <James.Bottomley@suse.de>2009-12-04 21:01:39 +0300
commit1796e72291b2b6aafaec5954e666d0b5a95da935 (patch)
tree41432a598971de113b213ff39736b436a97113cc /drivers/scsi/libiscsi.c
parentb20d038dff877566694181578c49c31616d622cd (diff)
downloadlinux-1796e72291b2b6aafaec5954e666d0b5a95da935.tar.xz
[SCSI] libiscsi: hook into ramp up/down handling
It is rare to get a queue full with iscsi, because targets seem to just reduce the iscsi cmd window. However, there is at least one iscsi target that will throw a queue full when overloaded. This hooks the iscsi code in to the ramp up/down code, so we can handle it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/libiscsi.c')
-rw-r--r--drivers/scsi/libiscsi.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 07ec997c5d4f..b7689f3d05f5 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1739,10 +1739,19 @@ EXPORT_SYMBOL_GPL(iscsi_queuecommand);
int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
{
- if (reason != SCSI_QDEPTH_DEFAULT)
+ switch (reason) {
+ case SCSI_QDEPTH_DEFAULT:
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+ break;
+ case SCSI_QDEPTH_QFULL:
+ scsi_track_queue_full(sdev, depth);
+ break;
+ case SCSI_QDEPTH_RAMP_UP:
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+ break;
+ default:
return -EOPNOTSUPP;
-
- scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+ }
return sdev->queue_depth;
}
EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);