On Tue, Dec 08, 2015 at 08:08:21AM +0200, Leon Romanovsky wrote:
On Mon, Dec 07, 2015 at 03:43:06PM -0500, Dennis Dalessandro wrote:
+
+#define BAD_DMA_ADDRESS ((u64)0)
What is the advantage in using directly u64 values instead of
pointers? You will get NULL and functions which return pointers
without need of casting.
...
+static u64 rvt_dma_map_single(struct ib_device *dev, void *cpu_addr,
+ size_t size, enum dma_data_direction direction)
+{
+ if (WARN_ON(!valid_dma_direction(direction)))
+ return BAD_DMA_ADDRESS;
+
+ return (u64)cpu_addr;
+}
An example of such function.
Honestly I'm not really sure why it's done this way. We are just following
the signature of the function in struct ib_dma_mapping_ops.
-Denny
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