Re: [PATCH] USB: introduce urb->core_status field
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Sun, 10 Jun 2007, Oliver Neukum wrote: > Am Sonntag, 10. Juni 2007 schrieb Greg KH: > > > Yes, it could be done that way, I think. It'll take more work than a > > > simple search-and-replace. The trickiest part is how to unlink an URB > > > after it has been submitted but before it has been handed to the HCD... > > > > We allow that today? How, multiple threads doing the submit and then > > unlink call? That's looney. We should not worry about that until after > > Isn't that exactly what a resubmission in the completion handler is? No. It may be similar in some vague sense but it's not the same thing at all. What Greg and I are talking about is this: CPU 0 CPU 1 ----- ----- call usb_submit_urb call usb_unlink_urb call hcd->driver->urb_enqueue What you're talking about is this: CPU 0 ----- call usb_hcd_giveback_urb call urb->complete call usb_submit_urb It doesn't involve multiple threads or unlinking. 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