From 5336940dd8b11180a0340ba886db62f728377d19 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Fri, 26 Oct 2007 13:56:24 +0200 Subject: [PATCH] x86: fix pci-gart failure handling blk_rq_map_sg doesn't initialize sg->dma_address/length to zero anymore. Some low level drivers reuse sg lists without initializing so IOMMUs might get non-zero dma_address/length. If map_sg fails, we need pass the number of the mapped entries to gart_unmap_sg. Signed-off-by: FUJITA Tomonori Signed-off-by: Jens Axboe --- arch/x86/kernel/pci-gart_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c index ae7e0161ce..79b514b381 100644 --- a/arch/x86/kernel/pci-gart_64.c +++ b/arch/x86/kernel/pci-gart_64.c @@ -435,7 +435,7 @@ static int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, error: flush_gart(); - gart_unmap_sg(dev, sg, nents, dir); + gart_unmap_sg(dev, sg, out, dir); /* When it was forced or merged try again in a dumb way */ if (force_iommu || iommu_merge) { out = dma_map_sg_nonforce(dev, sg, nents, dir); -- 2.20.1