linux-kernel - Re: [PATCHv4 12/17] pps: timestamp is always passed to dcd

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Message-ID: <20101121084248.GQ13356@enneenne.com>
Date:	Sun, 21 Nov 2010 09:42:48 +0100
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Alexander Gordeev <lasaine@....cs.msu.su>
Cc:	linux-kernel@...r.kernel.org,
	"Nikita V. Youshchenko" <yoush@...msu.su>,
	linuxpps@...enneenne.com, Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tilman Schmidt <tilman@...p.cc>, linux-doc@...r.kernel.org
Subject: Re: [PATCHv4 12/17] pps: timestamp is always passed to dcd_change()

On Sun, Nov 21, 2010 at 03:44:02AM +0300, Alexander Gordeev wrote:
> ?? Sat, 20 Nov 2010 17:23:04 +0100
> Rodolfo Giometti <giometti@...eenne.com> ??????????:
> 
> > On Thu, Nov 18, 2010 at 07:01:05PM +0300, Alexander Gordeev wrote:
> > > Remove the code that gatheres timestamp in pps_tty_dcd_change() in case
> > > passed ts parameter is NULL because it never happens in the current
> > > code. Fix comments as well.
> > > 
> > > Signed-off-by: Alexander Gordeev <lasaine@....cs.msu.su>
> > > ---
> > >  Documentation/serial/tty.txt    |    2 +-
> > >  drivers/pps/clients/pps-ldisc.c |    8 --------
> > >  include/linux/tty_ldisc.h       |    2 +-
> > >  3 files changed, 2 insertions(+), 10 deletions(-)
> > > 
> > > diff --git a/Documentation/serial/tty.txt b/Documentation/serial/tty.txt
> > > index 7c90050..540db41 100644
> > > --- a/Documentation/serial/tty.txt
> > > +++ b/Documentation/serial/tty.txt
> > > @@ -107,7 +107,7 @@ write_wakeup()	-	May be called at any point between open and close.
> > >  
> > >  dcd_change()	-	Report to the tty line the current DCD pin status
> > >  			changes and the relative timestamp. The timestamp
> > > -			can be NULL.
> > > +			cannot be NULL.
> > 
> > Can you please explain why it cannot be null? O_o
> > 
> > Who does supply the timestamp to dcd_change?
> 
> dcd_change() is called only from one place - uart_handle_dcd_change() -
> which always obtains and passes timestamps to the former. So no need to
> check if ts is NULL and obtain ts again.

Acked-by: Rodolfo Giometti <giometti@...ux.it>

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