linux-kernel - [PATCH 2/2] platform/x86: asus-wmi: don't fail if platform

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Message-ID: <20240713075940.80073-3-luke@ljones.dev>
Date: Sat, 13 Jul 2024 19:59:40 +1200
From: "Luke D. Jones" <luke@...nes.dev>
To: platform-driver-x86@...r.kernel.org
Cc: corentin.chary@...il.com,
	hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	linux-kernel@...r.kernel.org,
	"Luke D. Jones" <luke@...nes.dev>
Subject: [PATCH 2/2] platform/x86: asus-wmi: don't fail if platform_profile already registered

On some newer laptops it appears that an AMD driver can register a
platform_profile handler. If this happens then the asus_wmi driver would
error with -EEXIST when trying to register its own handler leaving the
user with a possibly unusable system - this is especially true for
laptops with an MCU that emit a stream of HID packets, some of which can
be misinterpreted as shutdown signals.

We can safely continue loading the driver instead of bombing out.

Signed-off-by: Luke D. Jones <luke@...nes.dev>
---
 drivers/platform/x86/asus-wmi.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 4c129881ce28..7d87ff68f418 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -3836,8 +3836,13 @@ static int platform_profile_setup(struct asus_wmi *asus)
 		asus->platform_profile_handler.choices);
 
 	err = platform_profile_register(&asus->platform_profile_handler);
-	if (err)
+	if (err == -EEXIST) {
+		pr_warn("%s, a platform_profile handler is already registered\n", __func__);
+		return 0;
+	} else if (err) {
+		pr_err("%s, failed at platform_profile_register: %d\n", __func__, err);
 		return err;
+	}
 
 	asus->platform_profile_support = true;
 	return 0;
@@ -4713,7 +4718,7 @@ static int asus_wmi_add(struct platform_device *pdev)
 		throttle_thermal_policy_set_default(asus);
 
 	err = platform_profile_setup(asus);
-	if (err)
+	if (err && err != -EEXIST)
 		goto fail_platform_profile_setup;
 
 	err = asus_wmi_sysfs_init(asus->platform_device);
-- 
2.45.2