Date: Mon, 21 Aug 1995 09:18:20 -0700 (PDT) From: Julian Elischer <julian@ref.tfs.com> To: luigi@labinfo.iet.unipi.it (Luigi Rizzo) Cc: freebsd-hackers@freebsd.org Subject: Re: How to abort a DMA transfer ? Message-ID: <199508211618.JAA23776@ref.tfs.com> In-Reply-To: <199508210841.KAA13733@labinfo.iet.unipi.it> from "Luigi Rizzo" at Aug 21, 95 10:41:27 am
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> 2) the device is closed while the DMA is active (which is essentially
> all the times) *and* there will be no further data coming from the
> scanner (this is likely: the user knows he wants to close the
> device, thus he stops scanning and then gives the appropriate
> commands);
don't allow the close to complete until the DMA has completed..
> 3) a new open is requested, possibly with different parameters, which
> causes the need for a larger buffer; now I need to abort the
previous transfer, free the old memory, and malloc a newer block.
>
> > now)? I would personally do everything in avoiding even touching such
> > a hot iron like the DMAC.
>
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v
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