linux-kernel - Re: [PATCH v4] tty: rocket: Remove the rp

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Date:   Wed, 17 Apr 2019 08:27:41 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Fuqian Huang <huangfq.daxian@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] tty: rocket: Remove the rp_ioctl

On 16. 04. 19, 16:53, Fuqian Huang wrote:
> --- a/drivers/tty/rocket.c
> +++ b/drivers/tty/rocket.c
...
> -/*  IOCTL call handler into the driver */
> -static int rp_ioctl(struct tty_struct *tty,
> -		    unsigned int cmd, unsigned long arg)
> -{
> -	struct r_port *info = tty->driver_data;
> -	void __user *argp = (void __user *)arg;
> -	int ret = 0;
> -
> -	if (cmd != RCKP_GET_PORTS && rocket_paranoia_check(info, "rp_ioctl"))
> -		return -ENXIO;
> -
> -	switch (cmd) {
> -	case RCKP_GET_STRUCT:
> -		if (copy_to_user(argp, info, sizeof (struct r_port)))
> -			ret = -EFAULT;
> -		break;

I am not sure what Greg meant, but I had only this particular ioctl on
mind when I was writing about removal. The other ones might be used _in
theory_. Even though they are not exposed to userspace either. So if
they are not source of potential issues, I would keep them:

> -	case RCKP_GET_CONFIG:
> -		ret = get_config(info, argp);
> -		break;
> -	case RCKP_SET_CONFIG:
> -		ret = set_config(tty, info, argp);
> -		break;
> -	case RCKP_GET_PORTS:
> -		ret = get_ports(info, argp);
> -		break;
> -	case RCKP_RESET_RM2:
> -		ret = reset_rm2(info, argp);
> -		break;
> -	case RCKP_GET_VERSION:
> -		ret = get_version(info, argp);
> -		break;
> -	default:
> -		ret = -ENOIOCTLCMD;
> -	}
> -	return ret;
> -}

thanks,
-- 
js
suse labs