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| author |   Christoph Hellwig <hch@lst.de> | 2017-12-22 14:50:47 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-01-15 09:34:43 +0100 |
| commit | 205e1b7f51e4af2643eb1d61a6503e415cd1e014 (patch) | |
| tree | 378eab5560b61a7f479d9c9a35aed2415956a8e3 | |
| parent | s390: move s390_pci_dma_ops to asm/pci_dma.h (diff) | |
| download | linux-dev-205e1b7f51e4af2643eb1d61a6503e415cd1e014.tar.xz linux-dev-205e1b7f51e4af2643eb1d61a6503e415cd1e014.zip | |
dma-mapping: warn when there is no coherent_dma_mask
These days all devices should have a DMA coherent mask, and most dma_ops
implementations rely on that fact. But just to be sure add an assert to
ring the warning bell if that is not the case.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
| -rw-r--r-- | include/linux/dma-mapping.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index d84951865be7..16add66d5b68 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -513,6 +513,7 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size, void *cpu_addr; BUG_ON(!ops); + WARN_ON_ONCE(dev && !dev->coherent_dma_mask); if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr)) return cpu_addr; |