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>
---
Changes since v2:
- add Fixes tag
---
 drivers/platform/x86/wmi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index cb7e74f2b009..4f94e4b117f1 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -1346,6 +1346,11 @@ static int parse_wdg(struct device *wmi_bus_dev, struct platform_device *pdev)
 		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;

--
2.39.2

On Wed, 29 Nov 2023 19:16:54 +0100, Armin Wolf wrote:

> 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.
> 
> 


Thank you for your contribution, it has been applied to my local
review-ilpo branch. Note it will show up in the public
platform-drivers-x86/review-ilpo branch only once I've pushed my
local branch there, which might take a while.

The list of commits applied:
[1/1] platform/x86: wmi: Skip blocks with zero instances
      commit: cbf54f37600e874d82886aa3b2f471778cae01ce

--
 i.