Re: New USB stack on FreeBSD w/Linux emulation layer coming
Hans Petter Selasky <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Monday 21 May 2007 13:37, Oliver Neukum wrote: > Am Mittwoch, 16. Mai 2007 20:43 schrieb Hans Petter Selasky: > > The lock that you are holding during submission is the same lock that is > > protecting the callback. Actually you can end up calling the > > __usbd_callback() prematurely in my new USB stack, but that is handled > > just fine, through some recurse bits: > > That code needs to be shot, staked through the heart, burned and buried > in holy ground. If an operation fails, you return an error. What do you > think happens if the callback tries to repair the error and fails to do so? > You have to back out and start some watchdog timer. Typically when you get an error you start the clear-stall transfer. If that fails you back out and rely on a watchdog timer to start the transfer again later. Of course this won't go into an infinite loop :-) --HPS ------------------------------------------------------------------------- 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