Re: port-arm/54614: playing with uaudio panics on rpi

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

The following reply was made to PR port-arm/54614; it has been noted by GNATS.

From: Jason Thorpe <thorpej%me.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-arm-maintainer%netbsd.org@localhost,
 gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost
Subject: Re: port-arm/54614: playing with uaudio panics on rpi
Date: Sat, 12 Oct 2019 08:12:10 -0700

 IIRC, we've seen this problem with uvideo before as well.
 
 We should just loosen this assertion in the ARM bus_dma code and =
 explicitly allow zero-length bus_dmamap_sync operations (as a no-op).
 
 > On Oct 12, 2019, at 6:25 AM, sc.dying%gmail.com@localhost wrote:
 > [  26.9767799] panic: kernel diagnostic assertion "len > 0 && offset + =
 len <=3D map->dm_mapsize" failed: file =
 "/usr/src/sys/arch/arm/arm32/bus_dma.c", line 1058 len 0 offset 0 =
 mapsize 4096
 
 -- thorpej