[PATCH 3/4] platform/x86: think-lmi: Allow empty admin password

[Mark Pearson <mpearson-lenovo@squebb.ca>]

SVP = BIOS Supervisor/Admin password
SMP = BIOS System password

If SMP ACL is enabled in the BIOS then the system allows you to set the
SMP without a SVP password configured. Change code to allow this.
BIOS will return permissions error if SVP is required.

Signed-off-by: Mark Pearson <mpearson-lenovo@squebb.ca>
---
 drivers/platform/x86/think-lmi.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index 46ab82fb2898..751e351dfc42 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -469,7 +469,12 @@ static ssize_t new_password_store(struct kobject *kobj,
 		if (ret)
 			goto out;
 
-		if (tlmi_priv.pwd_admin->pwd_enabled) {
+		/*
+		 * Note admin password not always required if SMPControl enabled in BIOS,
+		 * So only set if it's configured.
+		 * Let BIOS figure it out - we'll get an error if operation not permitted
+		 */
+		if (tlmi_priv.pwd_admin->pwd_enabled && strlen(tlmi_priv.pwd_admin->password)) {
 			ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
 					tlmi_priv.pwd_admin->password);
 			if (ret)
-- 
2.47.0