[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>
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index f244d4f..68ef163 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -265,6 +265,9 @@
destroy_workqueue(shost->work_q);
scsi_destroy_command_freelist(shost);
+ if (shost->bqt)
+ blk_free_tags(shost->bqt);
+
kfree(shost->shost_data);
if (parent)