On Wed, 2017-12-06 at 00:38 +0800, Ming Lei wrote: > On Tue, Dec 05, 2017 at 04:22:33PM +0000, Bart Van Assche wrote: > > > > On Tue, 2017-12-05 at 13:00 +0800, Ming Lei wrote: > > > > > > No, do not mix two different things in one patch, especially the > > > fix part need to be backported to stable. > > > > > > The fix part should aim at V4.15, and the other part can be a > > > V4.16 stuff. > > > > Does this mean that you do not plan to post a v5 of your patch and > > that you want me to rework this patch series? I can do that. > > I believe V4 has been OK for merge, actually the only concern from > James is that 'set the cmnd to NULL *before* calling free so we > narrow the race window.', but that isn't required as I explained, > even though you don't do that in this patch too. > > https://marc.info/?t=151030464300003&r=1&w=2 > > I will work on V5 if Martin/James thinks it is needed.
I don't buy that it isn't needed. The point (and the pattern) is for a destructive action set the signal *before* you execute the action not after. The reason should be obvious: if you set it after you invite a race where the check says OK but the object has gone. Even if the race is highly unlikely, the pattern point still holds. James
