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From: David Gwynne (dlgcvs.openbsd.org)
Date: Sun Jun 22 2008 - 19:27:11 CDT
Module name: src
Changes by: dlgcvs.openbsd.org 2008/06/22 18:27:11
amd64s bus_dma internals use a pointer to a lastaddr variable to keep
track of where it was up to when building dmamaps. that lastaddr variable
is not initialised every time you start to load a dmamap, so it was using
random stack garbage as state when first writing the sg list.
fortunately the way it was used meant it was extremely unlikely to cause a
problem, but why allow even that possibility? this inits lastaddr to 0 in
all the callers of load_buffer.