Re: [PATCH 08/25] ALSA: korg1212: Convert to generic PCM copy ops

On Mon, Aug 14, 2023 at 01:55:06PM +0200, Takashi Iwai wrote:

This patch converts the korg1212 driver code to use the new unified PCM copy callback. The open-coded conditional memory copies are replaced with simpler copy_from/to_iter() calls.

Note that copy_from/to_iter() returns the copied bytes, hence the error condition is inverted from copy_from/to_user().

...

• if (!copy_to_iter(src, size, dst))
  

!= size ?

	return -EFAULT;

...

• if (!copy_from_iter(dst, size, src))
  return -EFAULT;
  

Ditto.