Commit 8270f3a1 authored by Christoph Hellwig's avatar Christoph Hellwig

dma-direct: fix DMA_ATTR_NO_KERNEL_MAPPING for remapped allocations

We need to return a dma_addr_t even if we don't have a kernel mapping.
Do so by consolidating the phys_to_dma call in a single place and jump
to it from all the branches that return successfully.

Fixes: bfd56cd6 ("dma-mapping: support highmem in the generic remap allocator")
Reported-by: Liviu Dudau <
Signed-off-by: default avatarChristoph Hellwig <>
Tested-by: default avatarLiviu Dudau <>
parent 06f55fd2
......@@ -204,8 +204,7 @@ void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
ret = dma_alloc_from_pool(size, &page, flags);
if (!ret)
return NULL;
*dma_handle = phys_to_dma(dev, page_to_phys(page));
return ret;
goto done;
page = __dma_direct_alloc_pages(dev, size, dma_handle, flags, attrs);
......@@ -215,8 +214,10 @@ void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
/* remove any dirty cache lines on the kernel alias */
arch_dma_prep_coherent(page, size);
return page; /* opaque cookie */
ret = page; /* opaque cookie */
goto done;
/* create a coherent mapping */
ret = dma_common_contiguous_remap(page, size, VM_USERMAP,
......@@ -227,9 +228,9 @@ void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
return ret;
*dma_handle = phys_to_dma(dev, page_to_phys(page));
memset(ret, 0, size);
*dma_handle = phys_to_dma(dev, page_to_phys(page));
return ret;
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment