arm64/dma-mapping: Remove extraneous null-pointer checks
The current null-pointer check in __dma_alloc_coherent and
__dma_free_coherent is not needed anymore since the
__dma_alloc/__dma_free functions won't be called if !dev (dummy ops will
be called instead).
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index 5392dbe..f72779a 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -48,8 +48,6 @@
/* do not use this function in a driver */
static inline bool is_device_dma_coherent(struct device *dev)
{
- if (!dev)
- return false;
return dev->archdata.dma_coherent;
}
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 3216e09..3e340b6 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -95,11 +95,6 @@
dma_addr_t *dma_handle, gfp_t flags,
unsigned long attrs)
{
- if (dev == NULL) {
- WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
- return NULL;
- }
-
if (IS_ENABLED(CONFIG_ZONE_DMA) &&
dev->coherent_dma_mask <= DMA_BIT_MASK(32))
flags |= GFP_DMA;
@@ -128,10 +123,6 @@
bool freed;
phys_addr_t paddr = dma_to_phys(dev, dma_handle);
- if (dev == NULL) {
- WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
- return;
- }
freed = dma_release_from_contiguous(dev,
phys_to_page(paddr),