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@xxxxxxxxxxxxxx> --- 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@xxxxxxxxxxxxxx>