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arm: dma-mapping: Don't override dma_ops in arch_setup_dma_ops()

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The arch_setup_dma_ops() function is in charge of setting dma_ops with a
call to set_dma_ops(). set_dma_ops() is also called from

- highbank and mvebu bus notifiers
- dmabounce (to be replaced with swiotlb)
- arm_iommu_attach_device

(arm_iommu_attach_device is itself called from IOMMU and bus master
device drivers)

To allow the arch_setup_dma_ops() call to be moved from device add time
to device probe time we must ensure that dma_ops already setup by any of
the above callers will not be overriden.

Aftering replacing dmabounce with swiotlb, converting IOMMU drivers to
of_xlate and taking care of highbank and mvebu, the workaround should be
removed.

Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Laurent Pinchart
2015-05-15 02:00:02 +03:00
committed by Joerg Roedel
parent d49f2dedf3
commit 26b37b946a
1 changed files with 9 additions and 0 deletions
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9
arch/arm/mm/dma-mapping.c
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@ -2390,6 +2390,15 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
const struct dma_map_ops *dma_ops;
dev->archdata.dma_coherent = coherent;
/*
* Don't override the dma_ops if they have already been set. Ideally
* this should be the only location where dma_ops are set, remove this
* check when all other callers of set_dma_ops will have disappeared.
*/
if (dev->dma_ops)
return;
if (arm_setup_iommu_dma_ops(dev, dma_base, size, iommu))
dma_ops = arm_get_iommu_dma_map_ops(coherent);
else