On Tue, Mar 03, 2020 at 09:36:29AM -0600, Pierre-Louis Bossart 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@linux.intel.com
I checked all the way to 5.2 and it was never used, so indeed wondering what the purpose of this function was.
I actually have a patch, removing that function, which I noticed as being unused during my VirtIO work. I think it was used by compressed.c before.
Thanks Guennadi