linux-kernel - [PATCH 09/19] swiotlb-xen: Make 'xen_swiotlb_free

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Message-Id: <1277235772-26757-10-git-send-email-konrad.wilk@oracle.com>
Date:	Tue, 22 Jun 2010 15:42:42 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	iommu@...ts.linux-foundation.org, albert_herranz@...oo.es,
	x86@...nel.org
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 09/19] swiotlb-xen: Make 'xen_swiotlb_free_coherent' work.

See "swiotlb-xen: Make 'xen_swiotlb_free_coherent' work." for
detailed description.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 lib/swiotlb-xen.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/lib/swiotlb-xen.c b/lib/swiotlb-xen.c
index 2ebfcbd..2640052 100644
--- a/lib/swiotlb-xen.c
+++ b/lib/swiotlb-xen.c
@@ -169,14 +169,13 @@ void
 xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
 			  dma_addr_t dev_addr)
 {
-	phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
+	int order = get_order(size);
+
+	if (dma_release_from_coherent(hwdev, order, vaddr))
+		return;
 
-	WARN_ON(irqs_disabled());
-	if (!is_xen_swiotlb_buffer(paddr))
-		free_pages((unsigned long)vaddr, get_order(size));
-	else
-		/* DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single */
-		swiotlb_tbl_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
+	xen_destroy_contiguous_region((unsigned long)vaddr, order);
+	free_pages((unsigned long)vaddr, order);
 }
 EXPORT_SYMBOL_GPL(xen_swiotlb_free_coherent);
 
-- 
1.7.0.1

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