El Lun 01 Jul 2002 19:24, Clemens Ladisch escribió: > In Linux 2.4.18 with usb-uhci (v1.275), the following code will create > a TD with wrong toggle bit: > > urb->pipe = rcvbulkpipe( ... ); > urb->dev = dev; > usb_submit_urb(urb); > > /* optionally: receive some data and resubmit the urb */ > > usb_unlink_urb(urb); > > urb->dev = dev; > usb_submit_urb(urb); > > The submit call before the unlink will toggle the D0/D1 bit in > dev->toggle[]. The call after the unlink will then use the toggled bit > although the TD of the unlinked URB hasn't been completed successfully. > Consequently, the next packet to be received will be lost. > > (the code may look silly, but it is the equivalent of executing > insmod; ... rmmod; insmod) > > The same happens with uhci (v1.1). >
As I know that you have checked out Daisuke Nagano's usb-midi driver... Perhaps is this the reason of the strange losing of the first midi event after closing and then reopening the /dev/midi device with that driver? And if true, how your new ALSA usb-midi driver will be affected ? Thanks in advance, Pedro ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
