ep_insert(): we only need tep->mtx around the insertion itself

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We do need ep->mtx (and we are holding it all along), but that's
the lock on the epoll we are inserting into; locking of the
epoll being inserted is not needed for most of that work -
as the matter of fact, we only need it to provide barriers
for the fastpath check (for now).

Move taking and releasing it into ep_insert().  The caller
(do_epoll_ctl()) doesn't need to bother with that at all.
Moreover, that way we kill the kludge in ep_item_poll() - now
it's always called with tep unlocked.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Al Viro 2020-09-26 18:15:26 -04:00

parent e3e096e7fc

commit 85353e919f

1 changed files with 10 additions and 18 deletions

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fs/eventpoll.c

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