Re: Multiple bulk vs. control URBs submission question
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Sun, 11 Mar 2007, Martin Drab wrote: > > And some devices are definitely known to crash if you send them a > > control URB while they are busy doing something else. > > Hmm, is it just due to the bug in their firmware or is the problem rather > in their USB chip hardware? You'll need to ask the manufacturer. > > > I always get stuck when trying this. Multiple bulk URBs submission seems > > > to work on its own, but when I then issue the first control urb, all > > > transmissions seem to freeze halfway. > > After it gets stuck, when I switch off the device, all the scheduled URBs > return with -EPROTO error. That's a normal error, indicating that the device isn't responding to packets. Not surprising, since you have turned it off. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel