[PATCH v2] platform/x86: thinkpad_acpi: Fix USB-C Security probe failure on unsupported platforms

[PATCH v2] platform/x86: thinkpad_acpi: Fix USB-C Security probe failure on unsupported platforms

[Vishnu Sankar]

On systems where the USCS ACPI method is absent, acpi_evalf() returns
AE_NOT_FOUND which maps to -EIO. This caused tpacpi_usbc_security_init()
to propagate the error and thinkpad_acpi failed to probe entirely on
unsupported platforms.

Fix this by checking for USCS method presence with acpi_has_method() before
attempting to call it, returning -ENODEV immediately if absent.
This follows the same pattern used by other subdrivers in thinkpad_acpi.c.

Fixes: 67e8d1e9cacd ("platform/x86: thinkpad_acpi: Add USB-C Security (USCS) support")
Reported-by: Oliver Lin <oliver@liuxiaozhen.dev>
Closes: https://lore.kernel.org/platform-driver-x86/239c8162-e1e6-4b49-8292-35547c5a525c@liuxiaozhen.dev/
Tested-by: Oliver Lin <oliver@liuxiaozhen.dev>
Signed-off-by: Vishnu Sankar <vishnuocv@gmail.com>
---
Changes since v1:
- Fix incorrect email address for Oliver Lin
- Add Tested-by from Oliver Lin confirming fix works on ThinkPad P15 Gen 1
  and ThinkPad P50s
---
 drivers/platform/x86/lenovo/thinkpad_acpi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/lenovo/thinkpad_acpi.c b/drivers/platform/x86/lenovo/thinkpad_acpi.c
index 91db4c8eeac2..85ed506516f0 100644
--- a/drivers/platform/x86/lenovo/thinkpad_acpi.c
+++ b/drivers/platform/x86/lenovo/thinkpad_acpi.c
@@ -11368,6 +11368,9 @@ static int tpacpi_usbc_security_init(struct ibm_init_struct *iibm)
 {
 	int err;
 
+	if (!acpi_has_method(hkey_handle, "USCS"))
+		return -ENODEV;
+
 	err = usbc_security_query(&tp_features.usbc_security_enabled);
 	if (err == -ENODEV)
 		return 0;
-- 
2.51.0