diff options
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index 29dfe52eb802..349deced87e8 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -883,6 +883,18 @@ static int wmi_dev_probe(struct device *dev) struct wmi_driver *wdriver = drv_to_wdrv(dev->driver); int ret = 0; + /* Some older WMI drivers will break if instantiated multiple times, + * so they are blocked from probing WMI devices with a duplicated GUID. + * + * New WMI drivers should support being instantiated multiple times. + */ + if (test_bit(WMI_GUID_DUPLICATED, &wblock->flags) && !wdriver->no_singleton) { + dev_warn(dev, "Legacy driver %s cannot be instantiated multiple times\n", + dev->driver->name); + + return -ENODEV; + } + if (wdriver->notify) { if (test_bit(WMI_NO_EVENT_DATA, &wblock->flags) && !wdriver->no_notify_data) return -ENODEV; |