iommu/vt-d: Introduce macro for_each_dev_scope() to walk device scope entries
Introduce for_each_dev_scope()/for_each_active_dev_scope() to walk
{active} device scope entries. This will help following RCU lock
related patches.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 58dde75..4ae6df2 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -170,9 +170,12 @@
void dmar_free_dev_scope(struct pci_dev ***devices, int *cnt)
{
+ int i;
+ struct pci_dev *tmp_dev;
+
if (*devices && *cnt) {
- while (--*cnt >= 0)
- pci_dev_put((*devices)[*cnt]);
+ for_each_active_dev_scope(*devices, *cnt, i, tmp_dev)
+ pci_dev_put(tmp_dev);
kfree(*devices);
*devices = NULL;
*cnt = 0;
@@ -402,10 +405,11 @@
struct pci_dev *dev)
{
int index;
+ struct pci_dev *tmp;
while (dev) {
- for (index = 0; index < cnt; index++)
- if (dev == devices[index])
+ for_each_active_dev_scope(devices, cnt, index, tmp)
+ if (dev == tmp)
return 1;
/* Check our parent */
@@ -452,7 +456,7 @@
if (list_empty(&dmar_drhd_units))
goto fail;
- list_for_each_entry(drhd, &dmar_drhd_units, list) {
+ for_each_drhd_unit(drhd) {
ret = dmar_parse_dev(drhd);
if (ret)
goto fail;