linux-kernel - Re: [PATCH v2 06/25] ALSA: emu8000: Convert to generic PCM copy ops

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Date:   Sat, 02 Sep 2023 08:01:53 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/25] ALSA: emu8000: Convert to generic PCM copy ops

On Sat, 02 Sep 2023 07:36:46 +0200,
Al Viro wrote:
> 
> On Tue, Aug 15, 2023 at 09:01:17PM +0200, Takashi Iwai wrote:
> > +		else if (copy_from_iter(&sval, 2, iter) != 2)		\
> > +			return -EFAULT;					\
> 
> copy_from_iter_full()?

It's a place in an internal copy to carry each 16bit word, so this is
intentional.

> > -static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
> > -				 int voice, unsigned long pos,
> > -				 void *src, unsigned long count)
> > -{
> > -	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
> > -
> > -	/* convert to word unit */
> > -	pos = (pos << 1) + rec->loop_start[voice];
> > -	count <<= 1;
> > -	LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
> > +	LOOP_WRITE(rec, pos, src, count);
> >  	return 0;
> >  }
> >  
> > @@ -483,16 +456,15 @@ static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
> >  	/* convert to word unit */
> >  	pos = (pos << 1) + rec->loop_start[voice];
> >  	count <<= 1;
> > -	LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
> > +	LOOP_WRITE(rec, pos, USER_SOCKPTR(NULL), count);
> 
> USER_SOCKPTR?

Oh, obviously a leftover :-<
It's a code in #if-0 block, and compiler didn't catch it.


Takashi