[PATCH 07/36] x86, PCI: add host bridge resource release for using _CRS

Yinghai Lu
2012-03-01T03:01:28Z

1. allocate pci_root_info instead of use local stack. we need to pass around info
for release fn.
2. add release_pci_root_info
3. set x86 own host bridge release fn, so will make sure root bridge
related resources get freed during root bus removal.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/pci/acpi.c | 63 +++++++++++++++++++++++++++++++++++++++++---------
1 files changed, 51 insertions(+), 12 deletions(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 763f7bb..c7a230f 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -305,11 +305,40 @@ static void add_resources(struct pci_root_info *info,
}
}

-static void free_pci_root_info(struct pci_root_info *info)
+static void free_pci_root_info_res(struct pci_root_info *info)
{
kfree(info->name);
kfree(info->res);
- memset(info, 0, sizeof(struct pci_root_info));
+ info->res = NULL;
+ info->res_num = 0;
+}
+
+static void __release_pci_root_info(struct pci_root_info *info)
+{
+ int i;
+ struct resource *res;
+
+ for (i = 0; i < info->res_num; i++) {
+ res = &info->res[i];
+
+ if (!res->parent)
+ continue;
+
+ if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
+ continue;
+
+ release_resource(res);
+ }
+
+ free_pci_root_info_res(info);
+
+ kfree(info);
+}
+static void release_pci_root_info(struct pci_host_bridge *bridge)
+{
+ struct pci_root_info *info = bridge->release_data;
+
+ __release_pci_root_info(info);
}

static void
@@ -342,7 +371,7 @@ probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
{
struct acpi_device *device = root->device;
- struct pci_root_info info;
+ struct pci_root_info *info = NULL;
int domain = root->segment;
int busnum = root->secondary.start;
LIST_HEAD(resources);
@@ -387,7 +416,13 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)

sd->domain = domain;
sd->node = node;
- memset(&info, 0, sizeof(struct pci_root_info));
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ kfree(sd);
+ printk(KERN_WARNING "pci_bus %04x:%02x: "
+ "ignored (out of memory)\n", domain, busnum);
+ return NULL;
+ }
/*
* Maybe the desired pci bus has been already scanned. In such case
* it is unnecessary to scan the pci bus with the given domain,busnum.
@@ -399,29 +434,33 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
* be replaced by sd.
*/
memcpy(bus->sysdata, sd, sizeof(*sd));
+ kfree(info);
kfree(sd);
} else {
- probe_pci_root_info(&info, device, busnum, domain);
+ probe_pci_root_info(info, device, busnum, domain);

/*
* _CRS with no apertures is normal, so only fall back to
* defaults or native bridge info if we're ignoring _CRS.
*/
if (pci_use_crs)
- add_resources(&info, &resources);
+ add_resources(info, &resources);
else {
- free_pci_root_info(&info);
+ free_pci_root_info_res(info);
x86_pci_root_bus_resources(busnum, &resources);
}
+
bus = pci_create_root_bus(NULL, busnum, &pci_root_ops, sd,
&resources);
- if (bus)
+ if (bus) {
bus->subordinate = pci_scan_child_bus(bus);
- else
+ pci_set_host_bridge_release(
+ to_pci_host_bridge(bus->bridge),
+ release_pci_root_info, info);
+ } else {
pci_free_resource_list(&resources);
-
- if (!bus && pci_use_crs)
- free_pci_root_info(&info);
+ __release_pci_root_info(info);
+ }
}

/* After the PCI-E bus has been walked and all devices discovered,
--
1.7.7