linux-kernel - Re: [PATCH 17/25] media: solo6x10: Convert to generic PCM copy ops

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Message-ID: <87350l3jix.wl-tiwai@suse.de>
Date:   Mon, 14 Aug 2023 14:17:42 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Ismael Luceno <ismael@...ev.co.uk>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Bluecherry Maintainers <maintainers@...echerrydvr.com>,
        Anton Sviridenko <anton@...p.bluecherry.net>,
        Andrey Utkin <andrey_utkin@...tmail.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH 17/25] media: solo6x10: Convert to generic PCM copy ops

On Mon, 14 Aug 2023 14:15:18 +0200,
Ismael Luceno wrote:
> 
> On 14/Aug/2023 13:55, Takashi Iwai wrote:
> > This patch converts the solo6x10 driver code to use the new unified
> > PCM copy callback.  It's a straightforward conversion from *_user() to
> > *_iter() variants.  As copy_to_iter() updates the internal offest at
> > each write, we can drop the dst counter update in the loop, too.
> > 
> > Note that copy_from/to_iter() returns the copied bytes, hence the
> > error condition is inverted from copy_from/to_user().
> > 
> > Cc: Bluecherry Maintainers <maintainers@...echerrydvr.com>
> > Cc: Anton Sviridenko <anton@...p.bluecherry.net>
> > Cc: Andrey Utkin <andrey_utkin@...tmail.com>
> > Cc: Ismael Luceno <ismael@...ev.co.uk>
> > Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> > Cc: linux-media@...r.kernel.org
> > Signed-off-by: Takashi Iwai <tiwai@...e.de>
> > ---
> >  drivers/media/pci/solo6x10/solo6x10-g723.c | 38 +++-------------------
> >  1 file changed, 5 insertions(+), 33 deletions(-)
> > 
> > diff --git a/drivers/media/pci/solo6x10/solo6x10-g723.c b/drivers/media/pci/solo6x10/solo6x10-g723.c
> > index 6cebad665565..aceacb822cab 100644
> > --- a/drivers/media/pci/solo6x10/solo6x10-g723.c
> > +++ b/drivers/media/pci/solo6x10/solo6x10-g723.c
> > @@ -204,9 +204,9 @@ static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
> >  	return idx * G723_FRAMES_PER_PAGE;
> >  }
> >  
> > -static int snd_solo_pcm_copy_user(struct snd_pcm_substream *ss, int channel,
> > -				  unsigned long pos, void __user *dst,
> > -				  unsigned long count)
> > +static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
> > +			     unsigned long pos, struct iov_iter *dst,
> > +			     unsigned long count)
> >  {
> >  	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
> >  	struct solo_dev *solo_dev = solo_pcm->solo_dev;
> > @@ -223,35 +223,8 @@ static int snd_solo_pcm_copy_user(struct snd_pcm_substream *ss, int channel,
> >  		if (err)
> >  			return err;
> >  
> > -		if (copy_to_user(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES))
> > +		if (!copy_to_iter(solo_pcm->g723_buf, G723_PERIOD_BYTES, dst))
> >  			return -EFAULT;
> > -		dst += G723_PERIOD_BYTES;
> > -	}
> > -
> > -	return 0;
> > -}
> > -
> > -static int snd_solo_pcm_copy_kernel(struct snd_pcm_substream *ss, int channel,
> > -				    unsigned long pos, void *dst,
> > -				    unsigned long count)
> > -{
> > -	struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
> > -	struct solo_dev *solo_dev = solo_pcm->solo_dev;
> > -	int err, i;
> > -
> > -	for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
> > -		int page = (pos / G723_FRAMES_PER_PAGE) + i;
> > -
> > -		err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
> > -				     SOLO_G723_EXT_ADDR(solo_dev) +
> > -				     (page * G723_PERIOD_BLOCK) +
> > -				     (ss->number * G723_PERIOD_BYTES),
> > -				     G723_PERIOD_BYTES, 0, 0);
> > -		if (err)
> > -			return err;
> > -
> > -		memcpy(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES);
> > -		dst += G723_PERIOD_BYTES;
> >  	}
> >  
> >  	return 0;
> > @@ -263,8 +236,7 @@ static const struct snd_pcm_ops snd_solo_pcm_ops = {
> >  	.prepare = snd_solo_pcm_prepare,
> >  	.trigger = snd_solo_pcm_trigger,
> >  	.pointer = snd_solo_pcm_pointer,
> > -	.copy_user = snd_solo_pcm_copy_user,
> > -	.copy_kernel = snd_solo_pcm_copy_kernel,
> > +	.copy = snd_solo_pcm_copy,
> >  };
> >  
> >  static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
> > -- 
> > 2.35.3
> > 
> 
> Signed-off-by: Ismael Luceno <ismael@...ev.co.uk>

You meant Reviewed-by or Acked-by?  Signed-off-by is a tag used when
you carry a patch.


thanks,

Takashi