linux-kernel - [PATCH] platform/x86: dell-wmi-sysman: correct an initialization failure

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Date:   Thu, 18 Feb 2021 13:17:23 -0600
From:   Mario Limonciello <mario.limonciello@...l.com>
To:     Hans De Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Mario Limonciello <mario.limonciello@...l.com>,
        Divya Bharathi <Divya.Bharathi@...l.com>,
        Alexander Naumann <alexandernaumann@....de>
Subject: [PATCH] platform/x86: dell-wmi-sysman: correct an initialization failure

On Dell systems that don't support this interface the module is
mistakingly returning error code "0", when it should be returning
-ENODEV.  Correct a logic error to guarantee the correct return code.

Cc: Divya Bharathi <Divya_Bharathi@...l.com>
Reported-by: Alexander Naumann <alexandernaumann@....de>
Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>
---
 drivers/platform/x86/dell-wmi-sysman/biosattr-interface.c     | 4 +++-
 drivers/platform/x86/dell-wmi-sysman/passwordattr-interface.c | 4 +++-
 drivers/platform/x86/dell-wmi-sysman/sysman.c                 | 4 ++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/dell-wmi-sysman/biosattr-interface.c b/drivers/platform/x86/dell-wmi-sysman/biosattr-interface.c
index f95d8ddace5a..8d59f81f9db4 100644
--- a/drivers/platform/x86/dell-wmi-sysman/biosattr-interface.c
+++ b/drivers/platform/x86/dell-wmi-sysman/biosattr-interface.c
@@ -175,7 +175,9 @@ static struct wmi_driver bios_attr_set_interface_driver = {
 
 int init_bios_attr_set_interface(void)
 {
-	return wmi_driver_register(&bios_attr_set_interface_driver);
+	int ret = wmi_driver_register(&bios_attr_set_interface_driver);
+
+	return wmi_priv.bios_attr_wdev ? ret : -ENODEV;
 }
 
 void exit_bios_attr_set_interface(void)
diff --git a/drivers/platform/x86/dell-wmi-sysman/passwordattr-interface.c b/drivers/platform/x86/dell-wmi-sysman/passwordattr-interface.c
index 5780b4d94759..bf449dc5ff47 100644
--- a/drivers/platform/x86/dell-wmi-sysman/passwordattr-interface.c
+++ b/drivers/platform/x86/dell-wmi-sysman/passwordattr-interface.c
@@ -142,7 +142,9 @@ static struct wmi_driver bios_attr_pass_interface_driver = {
 
 int init_bios_attr_pass_interface(void)
 {
-	return wmi_driver_register(&bios_attr_pass_interface_driver);
+	int ret = wmi_driver_register(&bios_attr_pass_interface_driver);
+
+	return wmi_priv.password_attr_wdev ? ret : -ENODEV;
 }
 
 void exit_bios_attr_pass_interface(void)
diff --git a/drivers/platform/x86/dell-wmi-sysman/sysman.c b/drivers/platform/x86/dell-wmi-sysman/sysman.c
index cb81010ba1a2..d9ad0e83b66f 100644
--- a/drivers/platform/x86/dell-wmi-sysman/sysman.c
+++ b/drivers/platform/x86/dell-wmi-sysman/sysman.c
@@ -513,13 +513,13 @@ static int __init sysman_init(void)
 	}
 
 	ret = init_bios_attr_set_interface();
-	if (ret || !wmi_priv.bios_attr_wdev) {
+	if (ret) {
 		pr_debug("failed to initialize set interface\n");
 		goto fail_set_interface;
 	}
 
 	ret = init_bios_attr_pass_interface();
-	if (ret || !wmi_priv.password_attr_wdev) {
+	if (ret) {
 		pr_debug("failed to initialize pass interface\n");
 		goto fail_pass_interface;
 	}
-- 
2.25.1