Currently we only free the allocated resource struct when error.
This would cause memory leak after pci_free_resource_list.
Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
---
Changes in v3:
Add some comments.
Changes in v2:
Don't change the resource_list_create_entry's behavior.
drivers/of/of_pci.c | 68 ++++++++++++++++++++++++++++-------------------------
1 file changed, 36 insertions(+), 32 deletions(-)
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 0ee42c3..6956e17 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -190,8 +190,7 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
struct list_head *resources, resource_size_t *io_base)
{
struct resource_entry *window;
- struct resource *res;
- struct resource *bus_range;
+ struct resource res;
struct of_pci_range range;
struct of_pci_range_parser parser;
char range_type[4];
@@ -200,24 +199,30 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
if (io_base)
*io_base = (resource_size_t)OF_BAD_ADDR;
- bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
- if (!bus_range)
- return -ENOMEM;
-
pr_info("host bridge %s ranges:\n", dev->full_name);
- err = of_pci_parse_bus_range(dev, bus_range);
+ err = of_pci_parse_bus_range(dev, &res);
if (err) {
- bus_range->start = busno;
- bus_range->end = bus_max;
- bus_range->flags = IORESOURCE_BUS;
- pr_info(" No bus range found for %s, using %pR\n",
- dev->full_name, bus_range);
+ res.start = busno;
+ res.end = bus_max;
+ res.flags = IORESOURCE_BUS;
+ pr_info(" No bus range found for %s\n", dev->full_name);
} else {
- if (bus_range->end > bus_range->start + bus_max)
- bus_range->end = bus_range->start + bus_max;
+ if (res.end > res.start + bus_max)
+ res.end = res.start + bus_max;
+ }
+
+ /*
+ * We add an empty resource and fill it in, to avoid allocating new
+ * resource struct.
+ * It might be racy here, but empty resources are harmless.
+ */
+ window = pci_add_resource(resources, NULL);
+ if (!window) {
+ err = -ENOMEM;
+ goto parse_failed;
}
- pci_add_resource(resources, bus_range);
+ *window->res = res;
/* Check for ranges property */
err = of_pci_range_parser_init(&parser, dev);
@@ -244,24 +249,16 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
continue;
- res = kzalloc(sizeof(struct resource), GFP_KERNEL);
- if (!res) {
- err = -ENOMEM;
- goto parse_failed;
- }
-
- err = of_pci_range_to_resource(&range, dev, res);
- if (err) {
- kfree(res);
+ err = of_pci_range_to_resource(&range, dev, &res);
+ if (err)
continue;
- }
- if (resource_type(res) == IORESOURCE_IO) {
+ if (resource_type(&res) == IORESOURCE_IO) {
if (!io_base) {
pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
dev->full_name);
err = -EINVAL;
- goto conversion_failed;
+ goto parse_failed;
}
if (*io_base != (resource_size_t)OF_BAD_ADDR)
pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
@@ -269,16 +266,23 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
*io_base = range.cpu_addr;
}
- pci_add_resource_offset(resources, res, res->start - range.pci_addr);
+ /*
+ * We add an empty resource and fill it in, to avoid allocating
+ * new resource struct.
+ * It might be racy here, but empty resources are harmless.
+ */
+ window = pci_add_resource(resources, NULL);
+ if (!window) {
+ err = -ENOMEM;
+ goto parse_failed;
+ }
+ *window->res = res;
+ window->offset = res.start - range.pci_addr;
}
return 0;
-conversion_failed:
- kfree(res);
parse_failed:
- resource_list_for_each_entry(window, resources)
- kfree(window->res);
pci_free_resource_list(resources);
return err;
}
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
