From ac315f96b3bd6f6b8f18f387816c7c2cc6b32e02 Mon Sep 17 00:00:00 2001 From: Logan Gunthorpe Date: Wed, 27 Oct 2021 11:47:57 -0600 Subject: iommu/dma: Fix incorrect error return on iommu deferred attach scsi_dma_map() was reporting a failure during boot on an AMD machine with the IOMMU enabled. scsi_dma_map failed: request for 36 bytes! The issue was tracked down to a mistake in logic: should not return an error if iommu_deferred_attach() returns zero. Reported-by: Marshall Midden Fixes: dabb16f67215 ("iommu/dma: return error code from iommu_dma_map_sg()") Link: https://lore.kernel.org/all/CAD2CkAWjS8=kKwEEN4cgVNjyFORUibzEiCUA-X+SMtbo0JoMmA@mail.gmail.com Signed-off-by: Logan Gunthorpe Cc: Joerg Roedel Cc: Will Deacon Link: https://lore.kernel.org/r/20211027174757.119755-1-logang@deltatee.com Signed-off-by: Joerg Roedel --- drivers/iommu/dma-iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/iommu') diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 896bea04c347..3e5a21b0bb24 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1016,7 +1016,8 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, if (static_branch_unlikely(&iommu_deferred_attach_enabled)) { ret = iommu_deferred_attach(dev, domain); - goto out; + if (ret) + goto out; } if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) -- cgit v1.2.3