linux-kernel - Re: [PATCH 6/8] pps: serial clients support.

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Message-ID: <20100221192101.GF21778@enneenne.com>
Date:	Sun, 21 Feb 2010 20:21:01 +0100
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Alexander Gordeev <lasaine@....cs.msu.su>
Subject: Re: [PATCH 6/8] pps: serial clients support.

On Fri, Feb 19, 2010 at 01:53:59PM -0800, Andrew Morton wrote:
> 
> hm.  The n_tty_open/close layering is a bit grubby but I guess we don't
> have a need to create anything more comprehensive at this stage.
> 
> A small stylistic thing: the code's a bit confusing at present because
> the names n_tty_open/n_tty_close are identical to the global functions
> over in n_tty.c.  A user of ctags will be tricked.  Also, the _way_ in
> which these function pointers are called:
> 
> 	ret = n_tty_open(tty);
> 
> make it look like the code is calling
> drivers/char/n_tty.c:n_tty_open().  Except it isn't.
> 
> So I think it's better to do it with
> 
> 	ret = (*n_tty_open)(tty);
> 
> to avoid misleading the reader.
> 
> And perhaps to rename these variables to avoid the duplication with the
> global functions.

It could be acceptable using functions
alias_n_tty_open()/alias_n_tty_close() modifying the code as follow?

diff --git a/drivers/pps/clients/pps-ldisc.c
b/drivers/pps/clients/pps-ldisc.c
index 59e6301..15c4622 100644
--- a/drivers/pps/clients/pps-ldisc.c
+++ b/drivers/pps/clients/pps-ldisc.c
@@ -53,7 +53,7 @@ static void pps_tty_dcd_change(struct tty_struct
*tty, unsigne
                        status ? "assert" : "clear", jiffies, id);
 }
 
-static int (*n_tty_open)(struct tty_struct *tty);
+static int (*alias_n_tty_open)(struct tty_struct *tty);
 
 static int pps_tty_open(struct tty_struct *tty)
 {
@@ -79,7 +79,7 @@ static int pps_tty_open(struct tty_struct *tty)
        tty->disc_data = (void *) ret;
 
        /* Should open N_TTY ldisc too */
-       ret = n_tty_open(tty);
+       ret = alias_n_tty_open(tty);
        if (ret < 0)
                pps_unregister_source((int) tty->disc_data);
 
@@ -88,14 +88,14 @@ static int pps_tty_open(struct tty_struct *tty)
        return 0;
 }
 
-static void (*n_tty_close)(struct tty_struct *tty);
+static void (*alias_n_tty_close)(struct tty_struct *tty);
 
 static void pps_tty_close(struct tty_struct *tty)
 {
        int id = (int) tty->disc_data;
 
        pps_unregister_source(id);
-       n_tty_close(tty);
+       alias_n_tty_close(tty);
 
        pr_info("PPS source #%d removed\n", id);
 }

Ciao,

Rodolfo

-- 

GNU/Linux Solutions                  e-mail: giometti@...eenne.com
Linux Device Driver                          giometti@...ux.it
Embedded Systems                     phone:  +39 349 2432127
UNIX programming                     skype:  rodolfo.giometti
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