Re: [PATCH v3] tty: vt: keyboard: add default switch-case, to handle smatch-warnings in method vt_do_kdgkb_ioctl

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On 11/7/21 01:17, Ajay Garg wrote:
On Sun, Nov 7, 2021 at 3:42 AM Pavel Skripkin <paskripkin@xxxxxxxxx> wrote:

On 11/7/21 01:03, Ajay Garg wrote:
> diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
> index c7fbbcdcc346..b83e7669658d 100644
> --- a/drivers/tty/vt/keyboard.c
> +++ b/drivers/tty/vt/keyboard.c
> @@ -2090,6 +2090,12 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
>
>               ret = 0;
>               break;
> +     default: {
> +             kbs = NULL;
> +             ret = -ENOIOCTLCMD;
> +
> +             break;
> +     }

Are these brackets needed here? There are no local variables inside
default case.

Hmm,

* case KDGKBSENT: uses braces.
* case KDSKBSENT: does not use braces.

I based the layout for default-case on the same lines as case
KDGKBSENT: , as I prefer explicit braces :)


I am not against these braces, but I, honestly, dislike them, because `case : {` syntax looks ugly _to me_.

KDGKBSENT uses it because of local variable `len` and not using them will cause build error.

I didn't find any strict requirements to not use brackets when there is no local variable, so it's up to maintainers (again).


Anyway, thank for respinning :)



With regards,
Pavel Skripkin



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