Commits
Robin Murphy committed 2d26e06cb1b
iommu/dma: Relax locking in iommu_dma_prepare_msi() [ Upstream commit c18647900ec864d401ba09b3bbd5b34f331f8d26 ] Since commit ece6e6f0218b ("iommu/dma-iommu: Split iommu_dma_map_msi_msg() in two parts"), iommu_dma_prepare_msi() should no longer have to worry about preempting itself, nor being called in atomic context at all. Thus we can downgrade the IRQ-safe locking to a simple mutex to avoid angering the new might_sleep() check in iommu_map(). Reported-by: Qian Cai <cai@lca.pw> Tested-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>