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

Message ID 1439363150-8661-24-git-send-email-hch@lst.de (mailing list archive)
State Not Applicable
Delegated to: Dan Williams
Headers show

Commit Message

Christoph Hellwig Aug. 12, 2015, 7:05 a.m. UTC 
Make all cache invalidation conditional on sg_has_page().

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

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