diff options
| -rw-r--r-- | drivers/platform/x86/wmi.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index abd0183c4107..29dfe52eb802 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -57,6 +57,7 @@ static_assert(__alignof__(struct guid_block) == 1); enum { /* wmi_block flags */ WMI_READ_TAKES_NO_ARGS, + WMI_GUID_DUPLICATED, WMI_NO_EVENT_DATA, }; @@ -196,6 +197,12 @@ static int wmidev_match_guid(struct device *dev, const void *data) struct wmi_block *wblock = dev_to_wblock(dev); const guid_t *guid = data; + /* Legacy GUID-based functions are restricted to only see + * a single WMI device for each GUID. + */ + if (test_bit(WMI_GUID_DUPLICATED, &wblock->flags)) + return 0; + if (guid_equal(guid, &wblock->gblock.guid)) return 1; @@ -207,6 +214,12 @@ static int wmidev_match_notify_id(struct device *dev, const void *data) struct wmi_block *wblock = dev_to_wblock(dev); const u32 *notify_id = data; + /* Legacy GUID-based functions are restricted to only see + * a single WMI device for each GUID. + */ + if (test_bit(WMI_GUID_DUPLICATED, &wblock->flags)) + return 0; + if (wblock->gblock.flags & ACPI_WMI_EVENT && wblock->gblock.notify_id == *notify_id) return 1; @@ -1036,10 +1049,12 @@ static int wmi_create_device(struct device *wmi_bus_dev, wblock->dev.dev.parent = wmi_bus_dev; count = guid_count(&wblock->gblock.guid); - if (count) + if (count) { dev_set_name(&wblock->dev.dev, "%pUL-%d", &wblock->gblock.guid, count); - else + set_bit(WMI_GUID_DUPLICATED, &wblock->flags); + } else { dev_set_name(&wblock->dev.dev, "%pUL", &wblock->gblock.guid); + } device_initialize(&wblock->dev.dev); |