linux-kernel - Re: [PATCH 4.19 07/86] ALSA: hda: do not override bus codec_mask in link

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Message-ID: <20200310223333.GA7285@duo.ucw.cz>
Date:   Tue, 10 Mar 2020 23:33:33 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Takashi Iwai <tiwai@...e.de>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 07/86] ALSA: hda: do not override bus codec_mask in
 link_get()

Hi!

> From: Kai Vehmanen <kai.vehmanen@...ux.intel.com>
> 
> [ Upstream commit 43bcb1c0507858cdc95e425017dcc33f8105df39 ]
> 
> snd_hdac_ext_bus_link_get() does not work correctly in case
> there are multiple codecs on the bus. It unconditionally
> resets the bus->codec_mask value. As per documentation in
> hdaudio.h and existing use in client code, this field should
> be used to store bit flag of detected codecs on the bus.
> 
> By overwriting value of the codec_mask, information on all
> detected codecs is lost. No current user of hdac is impacted,
> but use of bus->codec_mask is planned in future patches
> for SOF.

Given that no users are impacted, is this stable material?

Best regards,
							Pavel
							
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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