[Patch Part2 V2 04/17] iommu/vt-d: factor out dmar_alloc_dev_scope() for later reuse

From: Jiang Liu
Date: Wed Feb 19 2014 - 01:12:00 EST


Factor out function dmar_alloc_dev_scope() from dmar_parse_dev_scope()
for later reuse.

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
drivers/iommu/dmar.c | 28 ++++++++++++++++------------
include/linux/dmar.h | 1 +
2 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 1581565..58dde75 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -117,13 +117,9 @@ static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope,
return 0;
}

-int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
- struct pci_dev ***devices, u16 segment)
+void *dmar_alloc_dev_scope(void *start, void *end, int *cnt)
{
struct acpi_dmar_device_scope *scope;
- void * tmp = start;
- int index;
- int ret;

*cnt = 0;
while (start < end) {
@@ -138,15 +134,24 @@ int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
start += scope->length;
}
if (*cnt == 0)
- return 0;
+ return NULL;
+
+ return kcalloc(*cnt, sizeof(struct pci_dev *), GFP_KERNEL);
+}
+
+int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
+ struct pci_dev ***devices, u16 segment)
+{
+ struct acpi_dmar_device_scope *scope;
+ int index, ret;

- *devices = kcalloc(*cnt, sizeof(struct pci_dev *), GFP_KERNEL);
- if (!*devices)
+ *devices = dmar_alloc_dev_scope(start, end, cnt);
+ if (*cnt == 0)
+ return 0;
+ else if (!*devices)
return -ENOMEM;

- start = tmp;
- index = 0;
- while (start < end) {
+ for (index = 0; start < end; start += scope->length) {
scope = start;
if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT ||
scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) {
@@ -158,7 +163,6 @@ int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
}
index ++;
}
- start += scope->length;
}

return 0;
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index eccb0c0..1b08ce8 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -69,6 +69,7 @@ extern int dmar_table_init(void);
extern int dmar_dev_scope_init(void);
extern int dmar_parse_dev_scope(void *start, void *end, int *cnt,
struct pci_dev ***devices, u16 segment);
+extern void *dmar_alloc_dev_scope(void *start, void *end, int *cnt);
extern void dmar_free_dev_scope(struct pci_dev ***devices, int *cnt);

/* Intel IOMMU detection */
--
1.7.10.4

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