Re: [PATCH]generic usb serial driver
Oliver Neukum <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Organization | Novell |
| Message-ID | <[email protected]> |
Am Freitag, 30. März 2007 10:39 schrieb Greg KH: > > To solve this with locking would require both CPU A and CPU B to take > > the lock, which means that the urb would have to be submitted with > > GFP_ATOMIC. > > Can't this all be solved with a simple: > > get port spinlock > a = urb->status > write_busy = 0 > unlock spinlock > > In the callback, and in the write path: > > get port spinlock > if write_busy > unlock > exit > write_busy = 1 > unlock port spinlock > submit_urb > Oops. You are right. That would work. If you think that's simpler, yes it can be done. Regards Oliver ------------------------------------------------------------------------- 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