Hi Tomasz
在 2016/11/22 20:32, Tomasz Nowicki 写道:
Hi Dongdong,
On 22.11.2016 13:08, Dongdong Liu wrote:
The acpi_get_rc_resources() is used to get the RC register address that can
not be described in MCFG. It takes the _HID&segment to look for and returns
the RC address resource. Use PNP0C02 devices to describe such RC address
resource. Use _UID to match segment to tell which root bus the PNP0C02
resource belong to.
Signed-off-by: Dongdong Liu <liudongdong3@xxxxxxxxxx>
Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx>
---
drivers/pci/pci-acpi.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/pci/pci.h | 4 +++
2 files changed, 73 insertions(+)
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index d966d47..76fd6f4 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -29,6 +29,75 @@
0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d
};
+#ifdef CONFIG_ARM64
+static struct resource *acpi_get_rc_addr(struct acpi_device *adev)
+{
+ struct resource_entry *entry;
+ struct list_head list;
+ unsigned long flags;
+ int ret;
+ struct resource *res;
+
+ INIT_LIST_HEAD(&list);
+ flags = IORESOURCE_MEM;
+ ret = acpi_dev_get_resources(adev, &list,
+ acpi_dev_filter_resource_type_cb,
+ (void *) flags);
+ if (ret <= 0)
+ return NULL;
+
+ entry = list_first_entry(&list, struct resource_entry, node);
+ res = entry->res;
You return "res" memory pointer and...
+ acpi_dev_free_resource_list(&list);
free it here.
acpi_dev_free_resource_list
--->resource_list_free
--->resource_list_destroy_entry
--->resource_list_free_entry
--->kfree(entry)
only free entry not free entry->res, so this is ok.
Thanks
Dongdong
+ return res;
+}
We either allocate memory for res here or get it from the caller.
Tomasz
.
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