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

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Date:	Thu, 25 Jan 2007 13:07:04 -0500
From:	xiphmont@...h.org
To:	"Takashi Iwai" <tiwai@...e.de>
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

On 1/25/07, Takashi Iwai <tiwai@...e.de> wrote:
> At Thu, 25 Jan 2007 12:30:44 -0500,
> xiphmont@...h.org wrote:
> >
> > > I'm working on this now and will doublecheck just in case my test was
> > > flawed first time.
> >
> > Doublechecking indicates my initial test was wrong somehow; both
> > card->dev->parent and card->parent passed as arg 2 to the
> > device_create call in snd_register_device result in correct device
> > symlinks. Are these two actually semantically different?  I'm just
> > curious.
>
> If card->dev is created, they should be identical.
> But, again, card->dev should be NULL on the older systems.
>
> > The call to device_create in cound_core.c:sound_insert_unit also needs
> > to be modified in order for the device symlinks in the other unit
> > types to be correct.  Again, modifying the 'dev' argument to
> > '(dev?dev->parent:NULL)' appears to fix the problem.  Is that
> > correct/appropriate there?
>
> Your change breaks the expected heavior if CONFIG_SYSFS_DEPRECATED is
> enabled.  Then devices won't belong to card* objects any more...

FWIW, CONFIG_SYSFS_DEPRECATED is enabled on all my machines-- it's
exactly that behavior that is wrong in 2.6.20-rc5 and that I'm trying
to fix (and testing against here/now).

Having just checked a 2.6.18 machine, none of the device symlinks
point to card* objects; thay all point to /sys/devices/....

Monty
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