linux-kernel - Re: [PATCH] fix pktcdvd breakage from commit e105b8bfc769b0545b6f0f395179d1e43cbee822

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Message-ID: <ac3eb2510811300756icbf6fe5x3c41c7fc9f870db1@mail.gmail.com>
Date:	Sun, 30 Nov 2008 16:56:08 +0100
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Al Viro" <viro@...iv.linux.org.uk>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>, gregkh@...e.de,
	petero2@...ia.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix pktcdvd breakage from commit e105b8bfc769b0545b6f0f395179d1e43cbee822

On Sun, Nov 30, 2008 at 15:52, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Sun, Nov 30, 2008 at 03:28:15PM +0100, Kay Sievers wrote:
>> > So we need to preserve the layout, with the easiest way probably being "add
>> > one more ktype and use kobject_init_and_add() instead of that device_create()".
>> > Sigh...
>>
>> What do you mean? We just need to replace the bogus "pd->pkt_dev" with
>> MKDEV(0, 0) and we are fine.
>
> Userland-visible change - right now cat /sys/class/pktcdvd/pktcdvd3/dev will
> give you dev_t of the block device in question.

True, it's visible, but it's incorrect dead information which should
be removed. Subsystem != "block is defined as S_IFCHR, and there is no
such char device for pktcdvd. In fact the "dev" file of the pktcdvd
class device points in many cases to a USB device, which must be
fixed.

The whole pktcdvd class is not used at all, besides for exporting a
few files. The "dev" file at the class device is just a bug, and the
MAJOR/MINOR uevent environment variables also. I doubt that there will
be any visible breakage in something that isn't already totally
broken. In short, I doubt, that anything that works today will stop
working if we remove the bugus "dev" file.

This seem like the simple and correct fix for the issue with /sys/dev/
and the broken non-existing but exported pkcdvd char device:
-               pd->dev = device_create(class_pktcdvd, NULL, pd->pkt_dev, NULL,
+               pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL,

Kay
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