On Sat, Jun 10, 2017 at 12:41:10PM -0700, Olav Haugan wrote:
> @@ -149,6 +140,11 @@ static void *__dma_alloc(struct device *dev, size_t size,
> bool coherent = is_device_dma_coherent(dev);
> pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, false);
>
> + if (!dev) {
> + WARN_ONCE(1, "Use an actual device structure for DMA
> allocation\n");
> + return NULL;
> + }
> +
> size = PAGE_ALIGN(size);
>
> if (!coherent && !gfpflags_allow_blocking(flags)) {
> @@ -192,8 +188,13 @@ static void __dma_free(struct device *dev, size_t size,
> void *vaddr, dma_addr_t dma_handle,
> unsigned long attrs)
> {
> - void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));
> + void *swiotlb_addr;
>
> + if (!dev) {
> + WARN_ONCE(1, "Use an actual device structure for DMA free\n");
> + return;
> + }
> + swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));
I don't think we need the checks anymore. With commit 1dccb598df54
("arm64: simplify dma_get_ops") __generic_dma_ops() returns
dummy_dma_ops when dev == NULL, so the above __dma_alloc/__dma_free
functions would not be called.
--
Catalin
