[PATCH 4.14 09/45] hwmon: (dell-smm) Fix warning on /proc/i8k creation error

Greg Kroah-Hartman
2021-12-20T14:41:25Z

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
@@ -578,15 +578,18 @@ 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