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[ Upstream commit ac315f96b3bd6f6b8f18f387816c7c2cc6b32e02 ]
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 <marshallmidden@gmail.com>
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 <logang@deltatee.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20211027174757.119755-1-logang@deltatee.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
06cebea18a