On Wed, Jan 10, 2018 at 09:00:13AM +0100, Christoph Hellwig wrote: > 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 at lst.de> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com> > --- > include/linux/dma-mapping.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h > index d84951865be7..9f28b2fa329e 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->coherent_dma_mask); > > if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr)) > return cpu_addr; > -- > 2.14.2 >
