linux-kernel - [PATCH 23/31] sh: handle page-less SG entries

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Date:	Wed, 12 Aug 2015 09:05:42 +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 23/31] sh: handle page-less SG entries

Make all cache invalidation conditional on sg_has_page().

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/sh/kernel/dma-nommu.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/sh/kernel/dma-nommu.c b/arch/sh/kernel/dma-nommu.c
index 5b0bfcd..3b64dc7 100644
--- a/arch/sh/kernel/dma-nommu.c
+++ b/arch/sh/kernel/dma-nommu.c
@@ -33,9 +33,8 @@ static int nommu_map_sg(struct device *dev, struct scatterlist *sg,
 	WARN_ON(nents == 0 || sg[0].length == 0);
 
 	for_each_sg(sg, s, nents, i) {
-		BUG_ON(!sg_page(s));
-
-		dma_cache_sync(dev, sg_virt(s), s->length, dir);
+		if (sg_has_page(s))
+			dma_cache_sync(dev, sg_virt(s), s->length, dir);
 
 		s->dma_address = sg_phys(s);
 		s->dma_length = s->length;
@@ -57,8 +56,10 @@ static void nommu_sync_sg(struct device *dev, struct scatterlist *sg,
 	struct scatterlist *s;
 	int i;
 
-	for_each_sg(sg, s, nelems, i)
-		dma_cache_sync(dev, sg_virt(s), s->length, dir);
+	for_each_sg(sg, s, nelems, i) {
+		if (sg_has_page(s))
+			dma_cache_sync(dev, sg_virt(s), s->length, dir);
+	}
 }
 #endif
 
-- 
1.9.1

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