linux-kernel - Re: [PATCH V2] ASoC: fsl_esai: Add spin lock to protect reset, stop and start

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Date:   Mon, 28 Oct 2019 07:47:51 +0000
From:   "S.j. Wang" <shengjiu.wang@....com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
CC:     "timur@...nel.org" <timur@...nel.org>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] ASoC: fsl_esai: Add spin lock to protect reset, stop
 and start

Hi
> 
> On Fri, Oct 25, 2019 at 03:13:53PM +0800, Shengjiu Wang wrote:
> > xrun may happen at the end of stream, the
> > trigger->fsl_esai_trigger_stop maybe called in the middle of
> > fsl_esai_hw_reset, this may cause esai in wrong state after stop, and
> > there may be endless xrun interrupt.
> >
> > This issue may also happen with trigger->fsl_esai_trigger_start.
> >
> > So Add spin lock to lock those functions.
> >
> > Fixes: 7ccafa2b3879 ("ASoC: fsl_esai: recover the channel swap after
> > xrun")
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> 
> Some small comments inline. Once they are addressed, please add:
> 
> Acked-by: Nicolin Chen <nicoleotsuka@...il.com>
> 
> Thanks
> 
> > ---
> > Change in v2
> > -add lock for fsl_esai_trigger_start.
> >
> >  sound/soc/fsl/fsl_esai.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c index
> > 37b14c48b537..9b28e2af26e4 100644
> > --- a/sound/soc/fsl/fsl_esai.c
> > +++ b/sound/soc/fsl/fsl_esai.c
> > @@ -33,6 +33,7 @@
> >   * @fsysclk: system clock source to derive HCK, SCK and FS
> >   * @spbaclk: SPBA clock (optional, depending on SoC design)
> >   * @task: tasklet to handle the reset operation
> > + * @lock: spin lock to handle reset and stop behavior
> 
> Should be "between hw_reset() and trigger()" now.
> 
> >   * @fifo_depth: depth of tx/rx FIFO
> >   * @slot_width: width of each DAI slot
> >   * @slots: number of slots
> > @@ -56,6 +57,7 @@ struct fsl_esai {
> >       struct clk *fsysclk;
> >       struct clk *spbaclk;
> >       struct tasklet_struct task;
> > +     spinlock_t lock; /* Protect reset and stop */
> 
> We can drop the comments here since you add it to the top.

Here is required by the checkpatch.pl, so still is needed.

Best regards
Wang shengjiu