linux-kernel - dma_unmap_single() lacking cache sync on some archs?

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Message-ID: <4E7A7ED4.7080805@enea.com>
Date:	Thu, 22 Sep 2011 02:18:28 +0200
From:	Arvid Brodin <arvid.brodin@...a.com>
To:	<linux-kernel@...r.kernel.org>
Subject: dma_unmap_single() lacking cache sync on some archs?

Hi,

I would expect cache synchronization for DMA_TO_DEVICE and DMA_BIDIRECTIONAL
when dma_map_single() is called, and for DMA_FROM_DEVICE and DMA_BIDIRECTIONAL
when dma_unmap_single() is called.

However, on some architechtures (at least avr32, blackfin, ...), cache
synchronization only happens when dma_map_single() is called (and then
irrespective of DMA direction). dma_unmap_single() is a no-op for these archs.

Isn't this a bug?

(Please CC me in responses.)

-- 
Arvid Brodin
Enea Services Stockholm AB

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