Hi Greg, 2011/6/28 Németh Márton <nm127@xxxxxxxxxxx>: > From: Márton Németh <nm127@xxxxxxxxxxx> > > USBIP v1.0.0 protocol documentation. > > Signed-off-by: Márton Németh <nm127@xxxxxxxxxxx> > --- > > Hi, > > I tried to document the USBIP protocol as implemented in the Linux kernel 3.0-rc2. > > The description is a preliminary draft only, it may contain mistakes. I tried > to document what I have understand from the source code and from the actual > captured network traffic when the USBIP is in action. Please review it, correct it, > point out the missing parts. > > During I have documented the protocol a question came into my mind: why do we > have two different type of package when the URB completition handler is called, > namely USB_RET_SUBMIT and USBIP_RET_UNLINK? As far as I can see this causes race > condition because for one URB the completition handler is only called once. If > the one URB is sent in with USB_CMD_SUBMIT and then unlinked with USB_CMD_UNLINK > the completition handler is called only once. In the protocol, however, we have > two different type of packets: USB_RET_SUBMIT and USBIP_RET_UNLINK. The status > field of these messages may contain anything in this case depending on the timing. > > Regards, > > Márton Németh Sorry, just one question about the usbip protocol document. I would like to know why didn't you apply this patch. Thanks in advance! Best Regards, David > > _______________________________________________ > devel mailing list > devel@xxxxxxxxxxxxxxxxxxxxxx > http://driverdev.linuxdriverproject.org/mailman/listinfo/devel > _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
