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Date: Sun, 26 Dec 2010 14:14:44 -0800 (PST)
From: Tsozik <tsozik@...oo.com>
To: Pete Zaitcev <zaitcev@...hat.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
Pete,
My apology, reading Greg's post I realized that 2.6.35 (distributed with Fedora 14) is indeed outdated. I just checked out 2.6.37-rc7 tree and saw references to get_icount function. I will definetely address your concern,
Thank you again,
Vadim.
--- On Sun, 12/26/10, Tsozik <tsozik@...oo.com> wrote:
> From: Tsozik <tsozik@...oo.com>
> Subject: Re: [PATCH 1/1] mct_u232: IOCTL implementation
> To: "Pete Zaitcev" <zaitcev@...hat.com>
> Cc: "Greg Kroah-Hartman" <gregkh@...e.de>, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
> Date: Sunday, December 26, 2010, 2:41 PM
> Pete,
>
> Many thanks for your comment/concern. I borrowed an
> TIOCGICOUNT implementation from usb/serial/io_ti.c:
>
> case TIOCGICOUNT:
>
> dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
>
> port->number,
> edge_port->icount.rx, edge_port->icount.tx);
> if
> (copy_to_user((void __user *)arg,
> &edge_port->icount,
>
>
> sizeof(edge_port->icount)))
>
> return -EFAULT;
>
> return 0;
> }
>
> There are 2 similar TIOCGICOUNT implementations listed in
>
> ark3116.c
> io_edgeport.c
> io_ti.c
> mos7720.c
> mos7840.c
> ti_usb_3410_5052.c
>
> files under usb/serial/ directory. One based on io_ti.c and
> another based on io_edgeport.c. I borrowed one from io_ti.c,
> since it looked more effecient to me. I searched for any
> mention of get_icount function under linux-2.6.35 and didn't
> find any file which declared or called this function:
>
> [vtsozik@...1 linux-2.6.35]$ find . -type f -name '*.[c,h]'
> | xargs grep get_icount
> [vtsozik@...1 linux-2.6.35]$
>
> I'm wondering if you could give me a bit more information
> on this. Otherwise I would really prefer to proceed with
> something that already exists and tested. If by some reason
> you believe that alternative implementation from
> io_edgeport.c (please see code snippet below) should be used
> please let me know. Again I didn't see any reason for extra
> copy.
>
> case TIOCGICOUNT:
>
> cnow = edge_port->icount;
>
> memset(&icount, 0, sizeof(icount));
>
> icount.cts = cnow.cts;
>
> icount.dsr = cnow.dsr;
>
> icount.rng = cnow.rng;
>
> icount.dcd = cnow.dcd;
>
> icount.rx = cnow.rx;
>
> icount.tx = cnow.tx;
>
> icount.frame = cnow.frame;
>
> icount.overrun = cnow.overrun;
>
> icount.parity = cnow.parity;
>
> icount.brk = cnow.brk;
>
> icount.buf_overrun = cnow.buf_overrun;
>
>
> dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d",
>
>
> __func__, port->number, icount.rx, icount.tx);
> if
> (copy_to_user((void __user *)arg, &icount,
> sizeof(icount)))
>
> return -EFAULT;
>
> return 0;
> }
>
> Thank you in advance,
> Vadim.
>
> --- On Sun, 12/26/10, Pete Zaitcev <zaitcev@...hat.com>
> wrote:
>
> > From: Pete Zaitcev <zaitcev@...hat.com>
> > Subject: Re: [PATCH 1/1] mct_u232: IOCTL
> implementation
> > To: "Tsozik" <tsozik@...oo.com>
> > Cc: "Greg Kroah-Hartman" <gregkh@...e.de>,
> linux-usb@...r.kernel.org,
> linux-kernel@...r.kernel.org
> > Date: Sunday, December 26, 2010, 12:49 PM
> > 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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