From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Armin Wolf <W_Armin@gmx.de>,
        =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>,
        Guenter Roeck <linux@roeck-us.net>
Subject: [PATCH 5.4 13/18] hwmon: (dell-smm) Fix warning on /proc/i8k creation error
Date:   Wed, 15 Dec 2021 18:21:34 +0100
Message-Id: <20211215172023.264891956@linuxfoundation.org>
In-Reply-To: <20211215172022.795825673@linuxfoundation.org>
References: <20211215172022.795825673@linuxfoundation.org>
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From: Armin Wolf <W_Armin@gmx.de>

commit dbd3e6eaf3d813939b28e8a66e29d81cdc836445 upstream.

The removal function is called regardless of whether
/proc/i8k was created successfully or not, the later
causing a WARN() on module removal.
Fix that by only registering the removal function
if /proc/i8k was created successfully.

Tested on a Inspiron 3505.

Fixes: 039ae58503f3 ("hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Acked-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20211112171440.59006-1-W_Armin@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/hwmon/dell-smm-hwmon.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -588,15 +588,18 @@ static const struct file_operations i8k_
 	.unlocked_ioctl	= i8k_ioctl,
 };
 
+static struct proc_dir_entry *entry;
+
 static void __init i8k_init_procfs(void)
 {
 	/* Register the proc entry */
-	proc_create("i8k", 0, NULL, &i8k_fops);
+	entry = proc_create("i8k", 0, NULL, &i8k_fops);
 }
 
 static void __exit i8k_exit_procfs(void)
 {
-	remove_proc_entry("i8k", NULL);
+	if (entry)
+		remove_proc_entry("i8k", NULL);
 }
 
 #else