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

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Date:	Thu, 25 Jan 2007 18:47:26 +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 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...


Takashi
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