On Monday 26 November 2007 17:00:06 Larry Finger wrote:
> static int alloc_ringmemory(struct b43_dmaring *ring)
> {
> struct device *dev = ring->dev->dev->dev;
> + gfp_t flags = GFP_KERNEL;
>
> + /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K
> + * alignment and 8K buffers for 64-bit DMA with 8K alignment. Testing
> + * has shown that 4K is sufficient for the latter as long as the buffer
> + * does not cross an 8K boundary.
> + *
> + * For unknown reasons - possibly a hardware error - the BCM4311 rev
> + * 02, which uses 64-bit DMA, needs the ring buffer in very low memory,
> + * which accounts for the GFP_DMA flag below.
> + */
> + if (ring->dma64)
> + flags = GFP_DMA;
???
--
Greetings Michael.
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