iommu/vt-d, trivial: simplify code with existing macros

Simplify vt-d related code with existing macros and introduce a new
macro for_each_active_drhd_unit() to enumerate all active DRHD unit.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 1a60dd630bb4..eccb0c0c6cf6 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -53,6 +53,10 @@ extern struct list_head dmar_drhd_units;
 #define for_each_drhd_unit(drhd) \
         list_for_each_entry(drhd, &dmar_drhd_units, list)
 
+#define for_each_active_drhd_unit(drhd)                                 \
+        list_for_each_entry(drhd, &dmar_drhd_units, list)               \
+                if (drhd->ignored) {} else
+
 #define for_each_active_iommu(i, drhd)                                  \
         list_for_each_entry(drhd, &dmar_drhd_units, list)               \
                 if (i=drhd->iommu, drhd->ignored) {} else