On Mon, Apr 09, 2007 at 11:52:31AM -0400, Alan Stern wrote: > There is one significant difference between the behavior of root hubs > (as embodied in host controller hardware) and external hubs: When a > remote-wakeup signal is received, an external hub sends an interrupt > message at the _end_ of the resume sequence but a root hub generates > and interrupt at the _beginning_ of the resume sequence. The host > system must poll for the end of the sequence. > > When ehci-hcd was converted to interrupt-driven operation instead of > using polling, the remaining need for this particular poll was > overlooked. This patch (as894) fixes the problem. > > Signed-off-by: Alan Stern <[EMAIL PROTECTED]> > > --- > > Greg: > > This needs to go into 2.6.21. You can demonstrate the regression quite > easily, as follows: Plug in a high-speed device, like a USB flash drive, > to prevent the root hub from suspending. Then plug in an unpopulated > high-speed hub. Wait a couple of seconds for the hub to be suspended, > then try plugging anything into the hub. Without this patch, nothing will > happen.
Has anyone reported this happening? I think only user noticed bugs should go into the tree at this point in time. thanks, greg k-h ------------------------------------------------------------------------- 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 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
