io_uring: only call io_cqring_ev_posted() if events were posted
This normally doesn't cause any extra harm, but it does mean that we'll increment the eventfd notification count, if one has been registered with the ring. This can confuse applications, when they see more notifications on the eventfd side than are available in the ring. Do the nice thing and only increment this count, if we actually posted (or even overflowed) events. Reported-and-tested-by:Dan Melnic <dmm@fb.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
parent
84965ff8
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