linux-kernel - [PATCH] platform/x86: wmi: Skip blocks with zero instances

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Date:   Mon, 27 Nov 2023 23:22:42 +0100
From:   Armin Wolf <W_Armin@....de>
To:     hdegoede@...hat.com, ilpo.jarvinen@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] platform/x86: wmi: Skip blocks with zero instances

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@...il.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218188
Tested-by: Alexis Belmonte <alexbelm48@...il.com>
Signed-off-by: Armin Wolf <W_Armin@....de>
---
 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