MIPS74K dma coherence issue

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To: linux-mips@xxxxxxxxxxxxxx
Subject: MIPS74K dma coherence issue
From: Sven Schnelle <svens@xxxxxxxxxxxxxx>
Date: Mon, 7 Nov 2016 20:41:27 +0100
Cc: svens@xxxxxxxxxxxxxx

Hi List,

i was debugging a nasty problem where DMA data was incorrect
after dma_unmap_single(). Reason was that cache wasn't flushed
after DMA. Attached patch fixes this.

Regards
Sven

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