On Wed, Feb 17, 2010 at 03:06:23PM -0800, mikedunn@xxxxxxxxxxx wrote: > Hi all, > > Does the usb subsystem impose any restrictions on mixing asynchronous > (usb_submit_urb()) and synchronous (usb_bulk_msg(), et. al.) calls? For > example, do the callbacks for asynchronously submitted urbs have to complete > before a synchronous call is made? For the same endpoint, yes, that is a requirement (think of an endpoint as a pipe, you need to process the urbs for a pipe in-order of submission). For different endpoints, no, it's not a requirement. Hope this helps, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
