Yup, it's an incredibly unsafe pattern. It also leads to the pattern where auxiliary processing is handed off to a taskqueue, which then interleaves the lock ownership with the ithread and produces out-of-order packet reception.
Scott On Aug 8, 2013, at 5:18 PM, Adrian Chadd <adr...@freebsd.org> wrote: > .. and it's not just about "saturate the port" with traffic. > > It's also about "what happens if I shut down the MAC whilst I'm in the > process of programming in new RX/TX descriptors?" > > The ath(4) driver had a spectacular behaviour where if you mess things > up the wrong way it will quite happily DMA crap all over the memory of > your running system, leading to quite hilarious bugs. > > > > -adrian _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
