Re: port-evbarm/54696: Kernel panic in bus_dma.c on Raspberry Pi 3B/3B+

[Jason Thorpe <thorpej%me.com@localhost>]

> On Nov 13, 2019, at 1:05 PM, Michael van Elst <mlelstv%serpens.de@localhost> wrote:
> 
> The following reply was made to PR port-evbarm/54696; it has been noted by GNATS.
> 
> From: mlelstv%serpens.de@localhost (Michael van Elst)
> To: gnats-bugs%netbsd.org@localhost
> Cc: 
> Subject: Re: port-evbarm/54696: Kernel panic in bus_dma.c on Raspberry Pi 3B/3B+
> Date: Wed, 13 Nov 2019 21:03:51 -0000 (UTC)
> 
> dhop%nwlink.com@localhost writes:
> 
>> [   153.534940] panic: kernel diagnostic assertion "len > 0 && offset + len <= map->dm_mapsize" failed: file "/usr/src/sys/arch/arm/arm32/bus_dma.c", line 1058 len 0 offset 0 mapsize 8192
> 
> A zero length transfer. In that case it would be a uaudio (or audio?) bug.
> 
> No idea why that should be aarch64-specific.

We should probably just relax the bus_dma assertion there to be a no-op.

> 
> 
> -- 
> -- 
>                                 Michael van Elst
> Internet: mlelstv%serpens.de@localhost
>                                 "A potential Snark may lurk in every tree."
> 

-- thorpej