linux-kernel - Re: [Alsa-devel] [PATCH] alsa: correct nonsensical sysfs device symlinks

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Date:	Thu, 25 Jan 2007 19:38:48 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	xiphmont@...h.org
Cc:	"Pierre Ossman" <drzeus@...eus.cx>, fedora-desktop-list@...hat.com,
	alsa-devel@...a-project.org, jrb@...hat.com,
	"Greg KH" <greg@...ah.com>, linux-kernel@...r.kernel.org,
	mclasen@...hat.com, "Lennart Poettering" <lennart@...ttering.net>,
	perex@...e.cz
Subject: Re: [Alsa-devel] [PATCH] alsa: correct nonsensical sysfs device symlinks

At Thu, 25 Jan 2007 13:34:19 -0500,
xiphmont@...h.org wrote:
> 
> On 1/25/07, Takashi Iwai <tiwai@...e.de> wrote:
> 
> > The problem with your patch is that it breaks the structure newly
> > introduced.  In the new tree, card* contains the whole belonging
> > devices, and each device points to the one in the card object.
> > Passing dev->parent there cuts the relation between the card object
> > and each device.
> >
> > That's why my patch rules out setting card->dev with ifdef
> > CONFIG_SYSFS_DEPRECATED.  As fallback, it takes the parent device to
> > build the old style tree.
> >
> > > Having just checked a 2.6.18 machine, none of the device symlinks
> > > point to card* objects; thay all point to /sys/devices/....
> >
> > Yes, it's a new stuff.
> 
> [This does beg the question: Does the benefit of this complete
> restructuring in a subminor release of an allegedly stable kernel
> outweigh the fact that it breaks all audio for any user running a
> gnome desktop?]

Well, that's not me who introduced that ;)

> OK, so my patch should be passing card->parent or dev->parent only in
> the case that CONFIG_SYSFS_DEPRECATED is set, and leaving the call the
> way it was previously in the case CONFIG_SYSFS_DEPRECATED is not set.
> Essentially, ifdef/else both cases?

Also, avoid creating card* instance.  It makes no sense in that case.
(So... what's wrong with my patch?)

> Is this also going to have to be the case for every other class type
> that converts from class_device_create to device_create?

I don't think so.  The case of sound class is more complicated, a
combination of API change and a new tree.


Takashi
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