This is a note to let you know that I've just added the patch titled
platform/x86: wmi: use guid_t and guid_equal()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
platform-x86-wmi-use-guid_t-and-guid_equal.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bf3bf85fd547854a57a1b4a114bf75bfe407d556
Author: Barnabás Pőcze <pobrn@xxxxxxxxxxxxxx>
Date: Sat Sep 4 17:55:39 2021 +0000
platform/x86: wmi: use guid_t and guid_equal()
[ Upstream commit 67f472fdacf4a691b1c3c20c27800b23ce31e2de ]
Instead of hard-coding a 16 long byte array,
use the available `guid_t` type and related methods.
Signed-off-by: Barnabás Pőcze <pobrn@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210904175450.156801-15-pobrn@xxxxxxxxxxxxxx
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Stable-dep-of: 028e6e204ace ("platform/x86: wmi: Break possible infinite loop when parsing GUID")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 529f725271e99..d55770711a831 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -39,7 +39,7 @@ MODULE_LICENSE("GPL");
static LIST_HEAD(wmi_block_list);
struct guid_block {
- char guid[16];
+ guid_t guid;
union {
char object_id[2];
struct {
@@ -124,7 +124,7 @@ static bool find_guid(const char *guid_string, struct wmi_block **out)
list_for_each_entry(wblock, &wmi_block_list, list) {
block = &wblock->gblock;
- if (memcmp(block->guid, &guid_input, 16) == 0) {
+ if (guid_equal(&block->guid, &guid_input)) {
if (out)
*out = wblock;
return true;
@@ -148,7 +148,7 @@ static const void *find_guid_context(struct wmi_block *wblock,
while (*id->guid_string) {
if (guid_parse(id->guid_string, &guid_input))
continue;
- if (!memcmp(wblock->gblock.guid, &guid_input, 16))
+ if (guid_equal(&wblock->gblock.guid, &guid_input))
return id->context;
id++;
}
@@ -460,7 +460,7 @@ EXPORT_SYMBOL_GPL(wmi_set_block);
static void wmi_dump_wdg(const struct guid_block *g)
{
- pr_info("%pUL:\n", g->guid);
+ pr_info("%pUL:\n", &g->guid);
if (g->flags & ACPI_WMI_EVENT)
pr_info("\tnotify_id: 0x%02X\n", g->notify_id);
else
@@ -542,7 +542,7 @@ wmi_notify_handler handler, void *data)
list_for_each_entry(block, &wmi_block_list, list) {
acpi_status wmi_status;
- if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
+ if (guid_equal(&block->gblock.guid, &guid_input)) {
if (block->handler &&
block->handler != wmi_notify_debug)
return AE_ALREADY_ACQUIRED;
@@ -582,7 +582,7 @@ acpi_status wmi_remove_notify_handler(const char *guid)
list_for_each_entry(block, &wmi_block_list, list) {
acpi_status wmi_status;
- if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
+ if (guid_equal(&block->gblock.guid, &guid_input)) {
if (!block->handler ||
block->handler == wmi_notify_debug)
return AE_NULL_ENTRY;
@@ -693,7 +693,7 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
{
struct wmi_block *wblock = dev_to_wblock(dev);
- return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid);
+ return sprintf(buf, "wmi:%pUL\n", &wblock->gblock.guid);
}
static DEVICE_ATTR_RO(modalias);
@@ -702,7 +702,7 @@ static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
{
struct wmi_block *wblock = dev_to_wblock(dev);
- return sprintf(buf, "%pUL\n", wblock->gblock.guid);
+ return sprintf(buf, "%pUL\n", &wblock->gblock.guid);
}
static DEVICE_ATTR_RO(guid);
@@ -785,10 +785,10 @@ static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct wmi_block *wblock = dev_to_wblock(dev);
- if (add_uevent_var(env, "MODALIAS=wmi:%pUL", wblock->gblock.guid))
+ if (add_uevent_var(env, "MODALIAS=wmi:%pUL", &wblock->gblock.guid))
return -ENOMEM;
- if (add_uevent_var(env, "WMI_GUID=%pUL", wblock->gblock.guid))
+ if (add_uevent_var(env, "WMI_GUID=%pUL", &wblock->gblock.guid))
return -ENOMEM;
return 0;
@@ -815,7 +815,7 @@ static int wmi_dev_match(struct device *dev, struct device_driver *driver)
if (WARN_ON(guid_parse(id->guid_string, &driver_guid)))
continue;
- if (!memcmp(&driver_guid, wblock->gblock.guid, 16))
+ if (guid_equal(&driver_guid, &wblock->gblock.guid))
return 1;
id++;
@@ -1108,7 +1108,7 @@ static int wmi_create_device(struct device *wmi_bus_dev,
wblock->dev.dev.bus = &wmi_bus_type;
wblock->dev.dev.parent = wmi_bus_dev;
- dev_set_name(&wblock->dev.dev, "%pUL", wblock->gblock.guid);
+ dev_set_name(&wblock->dev.dev, "%pUL", &wblock->gblock.guid);
device_initialize(&wblock->dev.dev);
@@ -1128,12 +1128,12 @@ static void wmi_free_devices(struct acpi_device *device)
}
}
-static bool guid_already_parsed(struct acpi_device *device, const u8 *guid)
+static bool guid_already_parsed(struct acpi_device *device, const guid_t *guid)
{
struct wmi_block *wblock;
list_for_each_entry(wblock, &wmi_block_list, list) {
- if (memcmp(wblock->gblock.guid, guid, 16) == 0) {
+ if (guid_equal(&wblock->gblock.guid, guid)) {
/*
* Because we historically didn't track the relationship
* between GUIDs and ACPI nodes, we don't know whether
@@ -1188,7 +1188,7 @@ static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
* case yet, so for now, we'll just ignore the duplicate
* for device creation.
*/
- if (guid_already_parsed(device, gblock[i].guid))
+ if (guid_already_parsed(device, &gblock[i].guid))
continue;
wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
@@ -1225,7 +1225,7 @@ static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
retval = device_add(&wblock->dev.dev);
if (retval) {
dev_err(wmi_bus_dev, "failed to register %pUL\n",
- wblock->gblock.guid);
+ &wblock->gblock.guid);
if (debug_event)
wmi_method_enable(wblock, 0);
list_del(&wblock->list);
@@ -1333,7 +1333,7 @@ static void acpi_wmi_notify_handler(acpi_handle handle, u32 event,
}
if (debug_event)
- pr_info("DEBUG Event GUID: %pUL\n", wblock->gblock.guid);
+ pr_info("DEBUG Event GUID: %pUL\n", &wblock->gblock.guid);
acpi_bus_generate_netlink_event(
wblock->acpi_device->pnp.device_class,
