linux-kernel - [PATCH 7/7] hwmon: (dell-smm) Reword and mark parameter "force" as unsafe

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Message-Id: <20220215191113.16640-8-W_Armin@gmx.de>
Date:   Tue, 15 Feb 2022 20:11:13 +0100
From:   Armin Wolf <W_Armin@....de>
To:     pali@...nel.org
Cc:     jdelvare@...e.com, linux@...ck-us.net, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] hwmon: (dell-smm) Reword and mark parameter "force" as unsafe

When enabling said module parameter, the driver ignores
all feature blacklists on relevant models, which has the
potential for strange side effects. Also there seems to
be a slight chance for unsupported devices to behave
badly when probed for features.
In such cases, the kernel should be tainted to inform
people that these issues might have been caused by
the dell_smm_hwmon driver with "force" enabled.
Also reword the parameter description to remind users
that enabling "force" also enables blacklisted features.

Tested on a Dell Inspiron 3505.

Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/hwmon/dell-smm-hwmon.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 04a41d59da60..67d63932b48a 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -87,8 +87,8 @@ MODULE_LICENSE("GPL");
 MODULE_ALIAS("i8k");

 static bool force;
-module_param(force, bool, 0);
-MODULE_PARM_DESC(force, "Force loading without checking for supported models");
+module_param_unsafe(force, bool, 0);
+MODULE_PARM_DESC(force, "Force loading without checking for supported models and features");

 static bool ignore_dmi;
 module_param(ignore_dmi, bool, 0);
--
2.30.2