Re: kern/55067: bge(4) does not work on MIPS systems (it panics)

[Nick Hudson <nick.hudson%gmx.co.uk@localhost>]

On 12/03/2020 22:40, Michael van Elst wrote:
> The following reply was made to PR kern/55067; it has been noted by GNATS.
>
> From: mlelstv%serpens.de@localhost (Michael van Elst)
> To: gnats-bugs%netbsd.org@localhost
> Cc:
> Subject: Re: kern/55067: bge(4) does not work on MIPS systems (it panics)
> Date: Thu, 12 Mar 2020 22:36:51 -0000 (UTC)
>
>   thorpej%me.com@localhost writes:
>
>   >[  23.6599208] panic: _bus_dmamap_sync: bad length
>
>   >0x83a29ab8: _bus_dmamap_sync+4bc (3,83edfc90,10998,0) ra 800726ec sz 72
>
>   mips _bus_dmamap_sync erroneously traps len == 0. It should be gracefully
>   allowing that value like other archs.

I said the same on source-changes-d, but here goes again.

The check for len !=0 in arm bus_dma.c has caught several bugs over the
years.

I plan on leaving it there.

Nick