WhyCan Forum(哇酷开发者社区)

#define BULK_EP_BUFFER_SIZE 65536 //改成8192都没用

bulk_dev->bulk_buffer = kzalloc(BULK_EP_BUFFER_SIZE,GFP_KERNEL|GFP_DMA);
            printk(KERN_DEBUG "will dma map single!\n");
        bulk_dev->dma_handle = dma_map_single(&udev->dev, bulk_dev->bulk_buffer, BULK_EP_BUFFER_SIZE, DMA_FROM_DEVICE);