platform/x86: wmi: Do not instantiate older WMI drivers multiple times

Many older WMI drivers cannot be instantiated multiple times for
two reasons:

- they are using the legacy GUID-based WMI API
- they are singletons (with global state)

Prevent such WMI drivers from binding to WMI devices with a duplicated
GUID, as this would mean that the WMI driver will be instantiated at
least two times (one for the original GUID and one for the duplicated
GUID).
WMI drivers which can be instantiated multiple times can signal this
by setting a flag inside struct wmi_driver.

Tested on a ASUS Prime B650-Plus.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20240226193557.2888-2-W_Armin@gmx.de
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

5 files changed, 16 insertions, 0 deletions

diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c
index db1e9240dd02..0b2299f7a2de 100644
--- a/drivers/platform/x86/dell/dell-wmi-ddv.c
+++ b/drivers/platform/x86/dell/dell-wmi-ddv.c
@@ -882,6 +882,7 @@ static struct wmi_driver dell_wmi_ddv_driver = {
 	},
 	.id_table = dell_wmi_ddv_id_table,
 	.probe = dell_wmi_ddv_probe,
+	.no_singleton = true,
 };
 module_wmi_driver(dell_wmi_ddv_driver);
 
diff --git a/drivers/platform/x86/intel/wmi/sbl-fw-update.c b/drivers/platform/x86/intel/wmi/sbl-fw-update.c
index 040153ad67c1..75c82c08117f 100644
--- a/drivers/platform/x86/intel/wmi/sbl-fw-update.c
+++ b/drivers/platform/x86/intel/wmi/sbl-fw-update.c
@@ -131,6 +131,7 @@ static struct wmi_driver intel_wmi_sbl_fw_update_driver = {
 	.probe = intel_wmi_sbl_fw_update_probe,
 	.remove = intel_wmi_sbl_fw_update_remove,
 	.id_table = intel_wmi_sbl_id_table,
+	.no_singleton = true,
 };
 module_wmi_driver(intel_wmi_sbl_fw_update_driver);
 
diff --git a/drivers/platform/x86/intel/wmi/thunderbolt.c b/drivers/platform/x86/intel/wmi/thunderbolt.c
index e2ad3f46f356..08df560a2c7a 100644
--- a/drivers/platform/x86/intel/wmi/thunderbolt.c
+++ b/drivers/platform/x86/intel/wmi/thunderbolt.c
@@ -63,6 +63,7 @@ static struct wmi_driver intel_wmi_thunderbolt_driver = {
 		.dev_groups = tbt_groups,
 	},
 	.id_table = intel_wmi_thunderbolt_id_table,
+	.no_singleton = true,
 };
 
 module_wmi_driver(intel_wmi_thunderbolt_driver);
diff --git a/drivers/platform/x86/wmi-bmof.c b/drivers/platform/x86/wmi-bmof.c
index 644d2fd889c0..df6f0ae6e6c7 100644
--- a/drivers/platform/x86/wmi-bmof.c
+++ b/drivers/platform/x86/wmi-bmof.c
@@ -94,6 +94,7 @@ static struct wmi_driver wmi_bmof_driver = {
 	.probe = wmi_bmof_probe,
 	.remove = wmi_bmof_remove,
 	.id_table = wmi_bmof_id_table,
+	.no_singleton = true,
 };
 
 module_wmi_driver(wmi_bmof_driver);
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;