iommu/dma: Relax locking in iommu_dma_prepare_msi()

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Since commit ece6e6f021 ("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>

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Robin Murphy 2019-12-09 19:47:25 +00:00 • committed by Joerg Roedel

parent f81b846dcd

commit c18647900e

1 changed files with 8 additions and 9 deletions

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drivers/iommu/dma-iommu.c

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