Re: OHCI hangs after failing to free resources
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Fri, 6 Jul 2007, Mike Nuss wrote: > > Here's what I meant. Normally SOF interrupts are disabled, but when > > the driver gets a completion interrupt for an URB it could turn on the > > SOF interrupt for the next frame only. Then when the next interrupt > > occurs the driver could compare the ED states with the donelist, > > checking for inconsistencies. > > What do you mean by 'completion interrupt for an URB?' For the last TD in an URB, ohci-hcd generally sets DI (DelayInterrupt) in the first dword to a value < 7 so the HC will generate an IRQ when the TD completes or shortly thereafter. That's the completion interrupt. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel