platform/x86: wmi: Skip blocks with zero instances

[ Upstream commit cbf54f37600e874d82886aa3b2f471778cae01ce ]

Some machines like the HP Omen 17 ck2000nf contain WMI blocks
with zero instances, so any WMI driver which tries to handle the
associated WMI device will fail.
Skip such WMI blocks to avoid confusing any WMI drivers.

Reported-by: Alexis Belmonte <alexbelm48@gmail.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218188
Fixes: bff431e49ff5 ("ACPI: WMI: Add ACPI-WMI mapping driver")
Tested-by: Alexis Belmonte <alexbelm48@gmail.com>
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20231129181654.5800-1-W_Armin@gmx.de
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index d064d8fb0a9a945b07865b09dfb9145dea84c4f8..b1cbe280d2a6aad601329d4d7aae74dffb54f0a8 100644 (file)
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -1215,6 +1215,11 @@ static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
                if (debug_dump_wdg)
                        wmi_dump_wdg(&gblock[i]);
 
+               if (!gblock[i].instance_count) {
+                       dev_info(wmi_bus_dev, FW_INFO "%pUL has zero instances\n", &gblock[i].guid);
+                       continue;
+               }
+
                if (guid_already_parsed_for_legacy(device, &gblock[i].guid))
                        continue;