Re: [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check_sync

From: Jarek Poplawski
Date: Wed Jan 20 2010 - 17:53:48 EST

On Wed, Jan 20, 2010 at 10:24:14PM +0000, Alan Cox wrote:
> > > Seems like an underlying bug in the DMA api. Maybe it just can't
> > > handle operations on partial mapping.
> > >
> > > Other drivers with same problem:
> > > bnx2, cassini, pcnet32, r8169, rrunner, skge, sungem, tg3,
> >
> > It seems using the same length (even without pci_unmap_len()) is
> > crucial here, but I hope maintainers (added to CC) will take care.
> The API needs fixing - if you've got a large mapping and you want to sync
> part of it then we need to support that. Now it might well be that the
> implementation on some braindead platform has to sync the entire thing,
> and some implementations entire pages or cache lines.
> You can't fix this in the drivers, they requested a service and they
> don't have enough information nor is it their job to know about all the
> platform specific rules.

Yes, the need to repeat some other values if there is a dedicated
structure/pointer could be misleading. Btw, it seems to be a trivial
overlooking since there is dma_sync_single_range() ready to use.

Jarek P.
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