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iommu/vt-d: Introduce macro for_each_dev_scope() to walk device scope entries

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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>
This commit is contained in:
Jiang Liu
2014-02-19 14:07:32 +08:00
committed by Joerg Roedel
parent b5f82ddf22
commit b683b230a2
3 changed files with 64 additions and 56 deletions
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14
drivers/iommu/dmar.c
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@@ -170,9 +170,12 @@ int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
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 @@ static int dmar_pci_device_match(struct pci_dev *devices[], int cnt,
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 @@ int __init dmar_dev_scope_init(void)
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;