Hi, On Wednesday 13 February 2013 16:53:02 John Baldwin wrote: > You shouldn't call routines that can drain like if_detach() or > destroy_dev() or the like while holding any mutexes period. I think you > need a 0) step which is "detach external consumers" including cdev's > (destroy_dev()) and ifnet's (if_detach). Once both of those routines have > finished, you can then proceed with actually stopping device operation, > and 2) is not needed as it can't happen once 0) has finished. >
Right. > When a device has both an ifnet and a cdev you may need something to > handle the case of one part being dead but not the other. For now you > can call if_detach() first as it doesn't sleep (though that is a > bug). The real fix for this case (and things like tun(4) can need this as > well) is to have a way to call just the non-blocking parts of things like > if_detach() and destroy_dev() first to mark the relevant portions as dead > and then follow those with blocking calls that do the drain. This is all > part of step 0 though. I feel this is out of my area. Can you push the right people to make such a change in the IFNET code and I can update the USB part. --HPS _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
