Re: swallowed wakeup in hiddev
Jiri Kosina <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Wed, 31 Jan 2007, Oliver Neukum wrote: > > coming from the URB submission which happened later - either the flags > > are cleared, or wake_up() will eventually happen (you are right that > > it might possibly be wake_up() corresponding to submission of URB > > submitted later, but does that matter?). > Yes, as you cannot make sure it'll come before the timeout strikes, nor > can you make sure the condition will be true when a second URB finishes. > This logic can fail under load. Actually, this is a current semantics of the usbhid_wait_io() function - it doesn't wait for a given URB to be delivered (which is what you seem to expect from it), but it rather waits until the given HID device completes pending I/O. Do you find this semantics broken in some way? Thanks, -- Jiri Kosina ------------------------------------------------------------------------- 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