[SCSI] add shared tag map helpers

This patch adds support for sharing tag maps at the host level
(i.e. either every queue [LUN] has its own tag map or there's a single
one for the entire host).  This formulation is primarily intended to
help single issue queue hardware, like the aic7xxx

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index f244d4f6597a..68ef1636678d 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -265,6 +265,9 @@ static void scsi_host_dev_release(struct device *dev)
                 destroy_workqueue(shost->work_q);
 
         scsi_destroy_command_freelist(shost);
+        if (shost->bqt)
+                blk_free_tags(shost->bqt);
+
         kfree(shost->shost_data);
 
         if (parent)