evie/android_kernel_oneplus_msm8998
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Merge "iommu: msm: add barrier call on coherent lazy map"

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Linux Build Service Account 2016-10-11 01:16:57 -07:00 • committed by Gerrit - the friendly Code Review server
commit f9e72fc169
1 changed files with 8 additions and 4 deletions
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12
drivers/iommu/msm_dma_iommu_mapping.c
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@ -17,6 +17,7 @@
#include <linux/rbtree.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <asm/barrier.h>
#include <linux/msm_dma_iommu_mapping.h>
@ -216,10 +217,13 @@ static inline int __msm_dma_map_sg(struct device *dev, struct scatterlist *sg,
sg->dma_length = iommu_map->sgl.dma_length;
kref_get(&iommu_map->ref);
/*
* Need to do cache operations here based on "dir" in the
* future if we go with coherent mappings.
*/
if (is_device_dma_coherent(dev))
/*
* Ensure all outstanding changes for coherent
* buffers are applied to the cache before any
* DMA occurs.
*/
dmb(ish);
ret = nents;
}
mutex_unlock(&iommu_meta->lock);