linux-kernel - Re: [RFC PATCH v3 04/13] ASoC: soc-pcm: introduce snd_soc_dpcm_fe_lock_irq/unlock

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Date:   Fri, 15 Oct 2021 11:54:34 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        <alsa-devel@...a-project.org>
CC:     <tiwai@...e.de>, <broonie@...nel.org>, <vkoul@...nel.org>,
        Gyeongtaek Lee <gt82.lee@...sung.com>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v3 04/13] ASoC: soc-pcm: introduce
 snd_soc_dpcm_fe_lock_irq/unlock_irq()



On 10/13/2021 8:00 PM, Pierre-Louis Bossart wrote:
> In preparation for more changes, add two new helpers to gradually
> modify the DPCM locks.
>
> Since DPCM functions are not used from interrupt handlers, we can only
> use the lock_irq case.
>
> While most of the uses of DPCM are internal to soc-pcm.c, some drivers
> in soc/fsl and soc/sh do make use of DPCM-related loops that will
> require protection, adding EXPORT_SYMBOL_GPL() is needed for those
> drivers.
>
> The stream argument is unused in this patch but will be enabled in
> follow-up patches.
>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> ---
>   include/sound/soc-dpcm.h |  3 +++
>   sound/soc/soc-pcm.c      | 42 +++++++++++++++++++++++-----------------
>   2 files changed, 27 insertions(+), 18 deletions(-)

1. Till this patch and with DEBUG_LOCKDEP config enabled, I see 
following warning:
    "WARNING: CPU: 0 PID: 0 at kernel/locking/irqflag-debug.c:10 
warn_bogus_irq_restore+0x30/0x40"

    However test passed though. Interestingly it was seen only for the 
first time I ran a 2x1 mixer test.

2. Also after I load sound modules and card gets registered, I see some 
hw_param() calls for FE and BE. This seems harmless at this point, but 
is getting problematic with subsequent patches. This was not happening 
earier.