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

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Date:	Sun, 23 Feb 2014 16:05:25 +0100
From:	David Herrmann <dh.herrmann@...il.com>
To:	Ray Strode <halfline@...il.com>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Hannes Reinecke <hare@...e.de>, 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

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.

Thanks
David
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