It seems D. Rock wrote:
> Hi,
>
> just noticed the new sysctl variable for ata. I just wanted to
> use the new way for disabling DMA on my disk (has some strange
> problems, even under windows).
>
> Previously I just commented out the ata_dmainit() lines in
> ata_disk.c, now I wanted to set it with sysctl:
>
> sysctl -w hw.atamodes="pio,dma,dma,dma"
>
> but this paniced my machine.
>
> I later discovered that there is no sanity check during setting
> the new modes: The machine in question didn't have a secondary
> IDE controller, but the variables were set without a range check.
>
> My solution was simple. Just use
> sysctl -w hw.atamodes="pio,dma"
>
> but I think, the ata driver should range check the settings.
It does but not for the first two devices as the are kindof magic
in some sense. I'll commit the fix asap..
-Søren
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