linux-kernel - Re: [PATCH 1/1] mct_u232: IOCTL implementation

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Date:	Sun, 26 Dec 2010 10:49:05 -0700
From:	Pete Zaitcev <zaitcev@...hat.com>
To:	Tsozik <tsozik@...oo.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] mct_u232: IOCTL implementation

On Sat, 25 Dec 2010 21:39:39 -0800 (PST)
Tsozik <tsozik@...oo.com> wrote:

> +++ mct_u232.c  2010-12-25 21:44:57.714640343 -0500
> +static int  mct_u232_ioctl(struct tty_struct *tty, struct file *file,
> +                        unsigned int cmd, unsigned long arg)
> +{
> +       case TIOCGICOUNT:
> +                dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
> +                    port->number, mct_u232_port->icount.rx, mct_u232_port->icount.tx);
> +                if (copy_to_user((void __user *)arg, &mct_u232_port->icount,
> +                    sizeof(mct_u232_port->icount)))
> +                        return -EFAULT;

This looks suspicious. Didn't we relocate the machinery for TIOCGICOUNT
into a generic place? Please examine how ->get_icount works before
hand-rolling the ioctl.

-- Pete
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