linux-kernel - [PATCH 4/9] hwmon: (dell-smm) Move DMI config handling to module init

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Date:   Fri,  3 Nov 2023 19:57:11 +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 4/9] hwmon: (dell-smm) Move DMI config handling to module init

Future SMM calling backends will not be able to probe during
module init, meaning the DMI tables holding config data would
have to drop their __initconst attribute.
Prevent this by moving the config handling to module init.

Tested-by: <serverror@...verror.com>
Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/hwmon/dell-smm-hwmon.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 3a792faf2369..3d14a3baf8e4 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -1370,7 +1370,6 @@ static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = {
 static int __init dell_smm_probe(struct platform_device *pdev)
 {
 	struct dell_smm_data *data;
-	const struct dmi_system_id *id;
 	int ret;

 	data = devm_kzalloc(&pdev->dev, sizeof(struct dell_smm_data), GFP_KERNEL);
@@ -1386,21 +1385,6 @@ static int __init dell_smm_probe(struct platform_device *pdev)
 	strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
 		sizeof(data->bios_machineid));

-	/*
-	 * Set fan multiplier and maximal fan speed from dmi config
-	 * Values specified in module parameters override values from dmi
-	 */
-	id = dmi_first_match(i8k_dmi_table);
-	if (id && id->driver_data) {
-		const struct i8k_config_data *conf = id->driver_data;
-
-		if (!fan_mult && conf->fan_mult)
-			fan_mult = conf->fan_mult;
-
-		if (!fan_max && conf->fan_max)
-			fan_max = conf->fan_max;
-	}
-
 	/* All options must not be 0 */
 	data->i8k_fan_mult = fan_mult ? : I8K_FAN_MULT;
 	data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH;
@@ -1429,6 +1413,7 @@ static struct platform_device *dell_smm_device;
 static void __init dell_smm_init_dmi(void)
 {
 	struct i8k_fan_control_data *control;
+	struct i8k_config_data *config;
 	const struct dmi_system_id *id;

 	if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
@@ -1449,6 +1434,20 @@ static void __init dell_smm_init_dmi(void)
 		}
 	}

+	/*
+	 * Set fan multiplier and maximal fan speed from DMI config.
+	 * Values specified in module parameters override values from DMI.
+	 */
+	id = dmi_first_match(i8k_dmi_table);
+	if (id && id->driver_data) {
+		config = id->driver_data;
+		if (!fan_mult && config->fan_mult)
+			fan_mult = config->fan_mult;
+
+		if (!fan_max && config->fan_max)
+			fan_max = config->fan_max;
+	}
+
 	id = dmi_first_match(i8k_whitelist_fan_control);
 	if (id && id->driver_data) {
 		control = id->driver_data;
--
2.39.2