On Wed, Apr 01, 2015 at 06:29:05PM +0100, Baxter, Jim wrote: > > > > FunctionFS is very specific, because read/write operations are directly > > translated into USB requests, which are asynchronous, so you cannot use > > O_NONBLOCK. > > > > If you need non-blocking API you can use Asynchronous I/O (AIO). You can > > find some examples in kernel sources (tools/usb/ffs-aio-example/). > > > > Br, > > Robert Baldyga > > > > Thank you, that sounds like the best approach. > In this case I think perhaps the long wait without any data is an > problem with the imx6 Chipidea USB controller. What's the possible problem? > > I guess it should suspend and drop the connections if there is no > traffic for more than 10ms? > If the Device side NAK host's IN/OUT token continually, the pipe will not be stopped, the host will send token continually until the application cancel this request. -- Best Regards, Peter Chen -- 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
