[PATCH] ASoC: SOF: Fix snd_sof_ipc_stream_posn()

[Kai Vehmanen]

Hi, 

On Tue, 3 Mar 2020, Dan Carpenter wrote:

> We're passing "&posn" instead of "posn" so it ends up corrupting
> memory instead of doing something useful.
[...]
>  	/* send IPC to the DSP */
>  	err = sof_ipc_tx_message(sdev->ipc,
> -				 stream.hdr.cmd, &stream, sizeof(stream), &posn,
> +				 stream.hdr.cmd, &stream, sizeof(stream), posn,
>  				 sizeof(*posn));

ack, thanks, this is clearly wrong. This function is not used by current 
platforms, so the bug has gone unnnoticed. Most platforms either rely on 
direct MMIO queries of the DSP position, or the periodic position updates 
DSPs send after each ALSA period. This function for host to query DSP 
position via IPC is thus not used, although it's part of the generic audio
DSP IPC interface.

For the SOF folks in CC, I wonder should we keep this function at all? 

Anyways, that's probably a longer discussion, so while it's there, 
the code should be correct, so for the patch:
Reviewed-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>

Br, Kai