linux-kernel - [PATCH 2/3] hwmon: (oxp-sensors) Move board detection to the init function

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Message-ID: <20230717124013.38796-4-samsagax@gmail.com>
Date:   Mon, 17 Jul 2023 09:40:05 -0300
From:   Joaquín Ignacio Aramendía 
        <samsagax@...il.com>
To:     linux@...ck-us.net
Cc:     Joaquín Ignacio Aramendía 
        <samsagax@...il.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org
Subject: [PATCH 2/3] hwmon: (oxp-sensors) Move board detection to the init function

This driver is not hotpluggable by nature so it makes more sense to
detect the board on init() instead of on probe().

Move detection logic to the start of init() function so we won't
instantiate the driver if the board is not compatible.
---
 drivers/hwmon/oxp-sensors.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/hwmon/oxp-sensors.c b/drivers/hwmon/oxp-sensors.c
index 1e1cc67bcdea..c70d9355eeba 100644
--- a/drivers/hwmon/oxp-sensors.c
+++ b/drivers/hwmon/oxp-sensors.c
@@ -438,19 +438,6 @@ static int oxp_platform_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device *hwdev;
 
-	/*
-	 * Have to check for AMD processor here because DMI strings are the
-	 * same between Intel and AMD boards, the only way to tell them apart
-	 * is the CPU.
-	 * Intel boards seem to have different EC registers and values to
-	 * read/write.
-	 */
-	dmi_entry = dmi_first_match(dmi_table);
-	if (!dmi_entry || boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
-		return -ENODEV;
-
-	board = (enum oxp_board)(unsigned long)dmi_entry->driver_data;
-
 	hwdev = devm_hwmon_device_register_with_info(dev, "oxpec", NULL,
 						     &oxp_ec_chip_info, NULL);
 
@@ -469,6 +456,21 @@ static struct platform_device *oxp_platform_device;
 
 static int __init oxp_platform_init(void)
 {
+	const struct dmi_system_id *dmi_entry;
+
+	/*
+	 * Have to check for AMD processor here because DMI strings are the
+	 * same between Intel and AMD boards, the only way to tell them apart
+	 * is the CPU.
+	 * Intel boards seem to have different EC registers and values to
+	 * read/write.
+	 */
+	dmi_entry = dmi_first_match(dmi_table);
+	if (!dmi_entry || boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+		return -ENODEV;
+
+	board = (enum oxp_board)(unsigned long)dmi_entry->driver_data;
+
 	oxp_platform_device =
 		platform_create_bundle(&oxp_platform_driver,
 				       oxp_platform_probe, NULL, 0, NULL, 0);
-- 
2.41.0