Re: [PATCH 2.6.30 1/2] cxgb3: fix dma mapping regression

From: David Miller
Date: Fri May 29 2009 - 04:57:03 EST

From: Divy Le Ray <divy@xxxxxxxxxxx>
Date: Thu, 28 May 2009 14:23:02 -0700

> From: Divy Le Ray <divy@xxxxxxxxxxx>
> Commit 5e68b772e6efd189d6aca76f6872fb75d51ace60
> cxgb3: map entire Rx page, feed map+offset to Rx ring.
> introduced a regression on platforms defining DECLARE_PCI_UNMAP_ADDR()
> and related macros as no-ops.
> Rx descriptors are fed with the a page buffer bus address + page chunk offset.
> The page buffer bus address is set and retrieved through
> pci_unamp_addr_set(), pci_unmap_addr().
> These functions being meaningless on x86 (if CONFIG_DMA_API_DEBUG is not set).
> The HW ends up with a bogus bus address.
> This patch saves the page buffer bus address for all plaftorms.
> Signed-off-by: Divy Le Ray <divy@xxxxxxxxxxx>

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