On Wed, Jul 22, 2015 at 09:55:40AM +0300, Sagi Grimberg wrote: > + size += max_t(int, MLX5_UMR_ALIGN - ARCH_KMALLOC_MINALIGN, 0); > + mr->klms = kzalloc(size, GFP_KERNEL); > + if (!mr->klms) > + return -ENOMEM; > + > + mr->pl_map = dma_map_single(device->dma_device, mr->klms, > + size, DMA_TO_DEVICE); This is a misuse of the DMA API, you must call dma_map_single after the memory is set by the CPU, not before. The fast reg varient is using coherent allocations, which is OK.. Personally, I'd switch them both to map_single, then when copying the scatter list - Make sure the buffer is DMA unmapped - Copy - dma_map_single Unless there is some additional reason for the coherent allocation.. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
