diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-08-06 14:33:23 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-08-10 19:52:45 +0200 |
| commit | cf14be0b41c659ede89abef3f7ec0e98e6cfea5b (patch) | |
| tree | ae57280bce6c3482f37a02b09fe5785a4006532b /kernel | |
| parent | 451577f3e3a9bf1861218641dbbf98e214e77851 (diff) | |
| download | linux-stable-cf14be0b41c659ede89abef3f7ec0e98e6cfea5b.tar.gz linux-stable-cf14be0b41c659ede89abef3f7ec0e98e6cfea5b.tar.bz2 linux-stable-cf14be0b41c659ede89abef3f7ec0e98e6cfea5b.zip | |
dma-direct: fix DMA_ATTR_NO_KERNEL_MAPPING
The new DMA_ATTR_NO_KERNEL_MAPPING needs to actually assign
a dma_addr to work. Also skip it if the architecture needs
forced decryption handling, as that needs a kernel virtual
address.
Fixes: d98849aff879 (dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code)
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/dma/direct.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 59bdceea3737..974e96a1de44 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -130,10 +130,12 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size, if (!page) return NULL; - if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) { + if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && + !force_dma_unencrypted(dev)) { /* remove any dirty cache lines on the kernel alias */ if (!PageHighMem(page)) arch_dma_prep_coherent(page, size); + *dma_handle = phys_to_dma(dev, page_to_phys(page)); /* return the page pointer as the opaque cookie */ return page; } @@ -178,7 +180,8 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr, { unsigned int page_order = get_order(size); - if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) { + if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && + !force_dma_unencrypted(dev)) { /* cpu_addr is a struct page cookie, not a kernel address */ __dma_direct_free_pages(dev, size, cpu_addr); return; |