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Re: proposal for bus_dma(9) change

On 5-Mar-09, at 2:55 PM, Andrew Doran wrote:

Sure. I can buy "make it explode in the developers face"... I can't
buy "let the DMA engine write to a bogus non-zero address if the guy
is sloppy"...

I have no idea how you made that connection.

yeah. That was clear in my head but not in my email... I just tracked down a bug in local code where a dmamap entry failed to bus_dmamap_load and hence my SG engine trampled on an mbuf that had since become re-used and was in the IP stack... Someone wasn't checking the result of a dmamap_load. So then we got talking here about error handling in dmamap_create...


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