i386/i386/busdma_machdep.c 1.88 breaks isp

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i386/i386/busdma_machdep.c 1.88 breaks isp
\ Charles DeBardeleben (14 Jun 2007)
. \ Scott Long (14 Jun 2007)
. \ Manfred Antar (14 Jun 2007)
. . \ Matthew Jacob (15 Jun 2007)

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Subject:	i386/i386/busdma_machdep.c 1.88 breaks isp
Group:	Freebsd-current
From:	Charles DeBardeleben
Date:	14 Jun 2007

I have a qlogic 12160 based controller and the driver hangs at attach.
I have traced the problem to _bus_dmamap_load_buffer() looping
in the for (seg = *segp; buflen > 0 ; ) {...} loop forever. Backing
back down to i386/i386/busdma_machdep.c 1.87 fixes the problem.
I have not tracked it down to whether the fix to _bus_dmamap_load_buffer()
is bad or if isp has a bug that is exposed by this fix. At least I
can run now.

-Charles
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