From: Thierry Reding <thierry.reding@avionic-design.de>
To: Takashi Iwai <tiwai@suse.de>
Cc: Jaroslav Kysela <perex@perex.cz>,
David Henningsson <david.henningsson@canonical.com>,
alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ALSA: hda - Defer probe when loading patch firmware
Date: Thu, 9 Aug 2012 09:08:13 +0200 [thread overview]
Message-ID: <20120809070813.GA6979@avionic-0098.mockup.avionic-design.de> (raw)
In-Reply-To: <s5hhascft86.wl%tiwai@suse.de>
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On Thu, Aug 09, 2012 at 08:57:13AM +0200, Takashi Iwai wrote:
> At Thu, 9 Aug 2012 08:45:23 +0200,
> Thierry Reding wrote:
> >
> > Recent changes to the firmware loading helpers cause drivers to stall
> > when firmware is loaded during the module_init() call. The snd-hda-intel
> > module requests firmware if the patch= parameter is used to load a patch
> > file. This patch works around the problem by deferring the probe in such
> > cases, which will cause the module to load successfully and the driver
> > binding to the device outside the module_init() call.
>
> Is the "recent" change meant 3.6 kernel, or in linux-next?
>
> In anyway, I don't understand why such a change was allowed. Most
> drivers do call request_firmware() at the device probing time.
> If this really has to be resolved in the driver side, it must be a bug
> in the firmware loader core code.
A good explanation of the problem and subsequent discussion can be found
here:
http://article.gmane.org/gmane.linux.drivers.video-input-infrastructure/49975
Thierry
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next prev parent reply other threads:[~2012-08-09 7:08 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-09 6:45 Thierry Reding
2012-08-09 6:57 ` Takashi Iwai
2012-08-09 7:08 ` Thierry Reding [this message]
2012-08-09 7:31 ` Takashi Iwai
2012-08-09 7:36 ` Thierry Reding
2012-08-09 7:42 ` Takashi Iwai
2012-08-09 7:50 ` Takashi Iwai
2012-08-09 7:57 ` Thierry Reding
2012-08-09 8:07 ` Thierry Reding
2012-08-09 8:21 ` Takashi Iwai
2012-08-09 9:19 ` Takashi Iwai
2012-08-09 10:34 ` Thierry Reding
2012-08-09 12:32 ` Takashi Iwai
2012-08-09 12:49 ` Thierry Reding
2012-08-09 13:06 ` Takashi Iwai
2012-08-09 13:09 ` [PATCH 0/2] HD-audio firmware loading fixes Takashi Iwai
2012-08-09 13:10 ` [PATCH 1/2] ALSA: hda - Load firmware in hda_intel.c Takashi Iwai
2012-08-09 14:26 ` Thierry Reding
2012-08-09 13:11 ` [PATCH 2/2] ALSA: hda - Deferred probing with request_firmware_nowait() Takashi Iwai
2012-08-09 13:26 ` David Henningsson
2012-08-09 13:32 ` Takashi Iwai
2012-08-09 13:36 ` [PATCH 2/2 v2] " Takashi Iwai
2012-08-09 13:54 ` David Henningsson
2012-08-09 14:04 ` Thierry Reding
2012-08-09 14:04 ` Takashi Iwai
2012-08-09 14:10 ` [PATCH 2/2 v3] " Takashi Iwai
2012-08-09 14:19 ` David Henningsson
2012-08-09 14:25 ` Thierry Reding
2012-08-09 14:34 ` Takashi Iwai
2012-08-09 14:38 ` Thierry Reding
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