linux-kernel - [PATCH AUTOSEL 6.1 28/29] hwmon: (corsair-psu) Fix probe when built-in

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Date:   Mon, 11 Dec 2023 08:54:12 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Armin Wolf <W_Armin@....de>, Guenter Roeck <linux@...ck-us.net>,
        Sasha Levin <sashal@...nel.org>, wilken.gottwalt@...teo.net,
        jdelvare@...e.com, linux-hwmon@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 28/29] hwmon: (corsair-psu) Fix probe when built-in

From: Armin Wolf <W_Armin@....de>

[ Upstream commit 307004e8b254ad28e150b63f299ab9caa4bc7c3e ]

It seems that when the driver is built-in, the HID bus is
initialized after the driver is loaded, which whould cause
module_hid_driver() to fail.
Fix this by registering the driver after the HID bus using
late_initcall() in accordance with other hwmon HID drivers.

Signed-off-by: Armin Wolf <W_Armin@....de>
Link: https://lore.kernel.org/r/20231207210723.222552-1-W_Armin@gmx.de
[groeck: Dropped "compile tested" comment; the patch has been tested
 but the tester did not provide a Tested-by: tag]
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hwmon/corsair-psu.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/corsair-psu.c b/drivers/hwmon/corsair-psu.c
index 2210aa62e3d06..ec7f27a6ce016 100644
--- a/drivers/hwmon/corsair-psu.c
+++ b/drivers/hwmon/corsair-psu.c
@@ -837,7 +837,23 @@ static struct hid_driver corsairpsu_driver = {
 	.reset_resume	= corsairpsu_resume,
 #endif
 };
-module_hid_driver(corsairpsu_driver);
+
+static int __init corsair_init(void)
+{
+	return hid_register_driver(&corsairpsu_driver);
+}
+
+static void __exit corsair_exit(void)
+{
+	hid_unregister_driver(&corsairpsu_driver);
+}
+
+/*
+ * With module_init() the driver would load before the HID bus when
+ * built-in, so use late_initcall() instead.
+ */
+late_initcall(corsair_init);
+module_exit(corsair_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Wilken Gottwalt <wilken.gottwalt@...teo.net>");
-- 
2.42.0