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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2016-11-02 07:12:47 -0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad@kernel.org> | 2016-11-07 15:06:32 -0500 |
| commit | 7641842164c34b672ef3e70e881e8a72735305c1 (patch) | |
| tree | 3cc9ce655ba49870ff070225b231f1d2074566b3 /include/xen/swiotlb-xen.h | |
| parent | ebcf6f979d55f35dfe36956364f0dce8c738220b (diff) | |
| download | linux-rt-7641842164c34b672ef3e70e881e8a72735305c1.tar.gz | |
swiotlb-xen: Enforce return of DMA_ERROR_CODE in mapping function
The mapping function should always return DMA_ERROR_CODE when a mapping has
failed as this is what the DMA API expects when a DMA error has occurred.
The current function for mapping a page in Xen was returning either
DMA_ERROR_CODE or 0 depending on where it failed.
On x86 DMA_ERROR_CODE is 0, but on other architectures such as ARM it is
~0. We need to make sure we return the same error value if either the
mapping failed or the device is not capable of accessing the mapping.
If we are returning DMA_ERROR_CODE as our error value we can drop the
function for checking the error code as the default is to compare the
return value against DMA_ERROR_CODE if no function is defined.
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
Diffstat (limited to 'include/xen/swiotlb-xen.h')
| -rw-r--r-- | include/xen/swiotlb-xen.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/include/xen/swiotlb-xen.h b/include/xen/swiotlb-xen.h index 7c35e279d1e3..a0083be5d529 100644 --- a/include/xen/swiotlb-xen.h +++ b/include/xen/swiotlb-xen.h @@ -51,9 +51,6 @@ xen_swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, int nelems, enum dma_data_direction dir); extern int -xen_swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); - -extern int xen_swiotlb_dma_supported(struct device *hwdev, u64 mask); extern int |