Consider the following:
current_device->read_urb = usb_alloc_urb(0, mem_flags);
usb_fill_bulk_urb(current_device->read_urb,
current_device->usb_device,
usb_rcvbulkpipe(current_device->usb_device, current_device->read_end_point),
current_device->read_buffer,
READ_BUFFER_SIZE,
read_callback,
current_device);
usb_submit_urb(current_device->read_urb, GFP_KERNEL);
Where in my case READ_BUFFER_SIZE is 4096.
The data that I'm expecting to receive from the device varies from 8 bytes up to almost 4K. In my experience the transfer_buffer in the read_callback() function actually has the amount of data expected. I'm just wondering if doing this causes memory problems for not honoring the max packet size for my endpoint.
Thanks.
- Ing. Joaquin Durand Gomez http://homepage.mac.com/joakod
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