linux-kernel - [PATCH 28/31] powerpc: handle page-less SG entries

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Date:	Wed, 12 Aug 2015 09:05:47 +0200
From:	Christoph Hellwig <hch@....de>
To:	torvalds@...ux-foundation.org, axboe@...nel.dk
Cc:	dan.j.williams@...el.com, vgupta@...opsys.com,
	hskinnemoen@...il.com, egtvedt@...fundet.no, realmz6@...il.com,
	dhowells@...hat.com, monstr@...str.eu, x86@...nel.org,
	dwmw2@...radead.org, alex.williamson@...hat.com,
	grundler@...isc-linux.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-alpha@...r.kernel.org,
	linux-ia64@...r.kernel.org, linux-metag@...r.kernel.org,
	linux-mips@...ux-mips.org, linux-parisc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	linux-nvdimm@...1.01.org, linux-media@...r.kernel.org
Subject: [PATCH 28/31] powerpc: handle page-less SG entries

Make all cache invalidation conditional on sg_has_page().

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/powerpc/kernel/dma.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 35e4dcc..cece40b 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -135,7 +135,10 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 	for_each_sg(sgl, sg, nents, i) {
 		sg->dma_address = sg_phys(sg) + get_dma_offset(dev);
 		sg->dma_length = sg->length;
-		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+		if (sg_has_page(sg)) {
+			__dma_sync_page(sg_page(sg), sg->offset, sg->length,
+					direction);
+		}
 	}
 
 	return nents;
@@ -200,7 +203,10 @@ static inline void dma_direct_sync_sg(struct device *dev,
 	int i;
 
 	for_each_sg(sgl, sg, nents, i)
-		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+		if (sg_has_page(sg)) {
+			__dma_sync_page(sg_page(sg), sg->offset, sg->length,
+					direction);
+		}
 }
 
 static inline void dma_direct_sync_single(struct device *dev,
-- 
1.9.1

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