netdev - [PATCH] rfkill: return ENOTTY on invalid ioctl

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Date: Wed, 01 Nov 2023 20:41:38 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Johannes Berg <johannes@...solutions.net>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] rfkill: return ENOTTY on invalid ioctl

For unknown ioctls the correct error is
ENOTTY "Inappropriate ioctl for device".

ENOSYS as returned before should only be used to indicate that a syscall
is not available at all.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 net/rfkill/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index 14cc8fe8584b..c3feb4f49d09 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -1351,11 +1351,11 @@ static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
 			     unsigned long arg)
 {
 	struct rfkill_data *data = file->private_data;
-	int ret = -ENOSYS;
+	int ret = -ENOTTY;
 	u32 size;

 	if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
-		return -ENOSYS;
+		return -ENOTTY;

 	mutex_lock(&data->mtx);
 	switch (_IOC_NR(cmd)) {

---
base-commit: 7d461b291e65938f15f56fe58da2303b07578a76
change-id: 20231101-rfkill-ioctl-enosys-00a2bb0a4ab1

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>