linux-kernel - Re: [PATCH v3 05/23] tty: Remove unnecessary re-test of ldisc ref count

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Message-ID: <1360252777.4102.42.camel@thor.lan>
Date:	Thu, 07 Feb 2013 10:59:37 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Cox <alan@...ux.intel.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ilya Zykov <ilya@...x.ru>, Dave Jones <davej@...hat.com>
Subject: Re: [PATCH v3 05/23] tty: Remove unnecessary re-test of ldisc ref
 count

On Thu, 2013-02-07 at 16:16 +0100, Jiri Slaby wrote:
> On 02/05/2013 09:20 PM, Peter Hurley wrote:
> > +	char cur_n[TASK_COMM_LEN], tty_n[64];
> > +	long timeout = 3 * HZ;
> > +
> > +	if (tty->ldisc) {	/* Not yet closed */
> > +		tty_unlock(tty);
> > +
> > +		while (tty_ldisc_wait_idle(tty, timeout) == -EBUSY) {
> > +			timeout = MAX_SCHEDULE_TIMEOUT;
> > +			printk_ratelimited(KERN_WARNING
> > +				"%s: waiting (%s) for %s took too long, but we keep waiting...\n",
> > +				__func__, get_task_comm(cur_n, current),
> > +				tty_name(tty, tty_n));
> >  		}
> > -		break;
> > +		/* must reacquire both locks and preserve lock order */
> > +		mutex_unlock(&tty->ldisc_mutex);
> > +		tty_lock(tty);
> > +		mutex_lock(&tty->ldisc_mutex);
> >  	}
> >  	return !!(tty->ldisc);
                   ^^^^^^^^^^^^
               still want me to fix this though?

> >  }
> 
> Ok, so you do it here. So we can silently ignore the comment on 04/23...


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