linux-kernel - Re: [PATCH 3.13 35/99] tty: Set correct tty name in active sysfs attribute

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Date:	Mon, 24 Feb 2014 10:51:41 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	David Herrmann <dh.herrmann@...il.com>,
	Ray Strode <halfline@...il.com>
CC:	Josh Boyer <jwboyer@...oraproject.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Werner Fink <werner@...e.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lennart Poettering <lennart@...ttering.net>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Jiri Slaby <jslaby@...e.cz>, Kay Sievers <kay@...y.org>
Subject: Re: [PATCH 3.13 35/99] tty: Set correct tty name in active sysfs
 attribute

On 02/23/2014 04:05 PM, David Herrmann wrote:
> Hi
> 
> On Sun, Feb 23, 2014 at 1:20 AM, Ray Strode <halfline@...il.com> wrote:
>> Hi,
>>
>>
>> On Feb 22, 2014 9:27 AM, "David Herrmann" <dh.herrmann@...il.com> wrote:
>>> How about this:
>>>
>>> +               driver = cs[i]->device(cs[i], &index);
>>> +                /* special case for tty0 which must not be resolved */
>>> +               if (driver && (index > 0 || cs[i]->major != TTY_MAJOR)) {
>>> +                       count += tty_line_name(driver, index, buf +
>>> count);
>>> +                       count += sprintf(buf + count, "%c", i ? ' ':'\n');
>>> +               } else
>>> +                       count += sprintf(buf + count, "%s%d%c",
>>> +                                        name, index, i ? ' ':'\n');
>>
>> Assuming I'm reading the code correctly, I don't think that will work.
>> Index will be rewritten from 0 to fg_console (which I suppose is going to be
>> 1) after the device vfunc is called.
> 
> Oh, nice catch. We have to use cs[i]->index of course. I only
> hand-edited the patch, I didn't even compile-test. But I guess you get
> the idea of special-casing tty0.
> 
Okay, that's a good idea.

I'll be redoing the patch.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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