tree f08920c4dfdef165841cd8559cc6ec44501a3225
parent 42288cb44c4b5fff7653bc392b583a2b8bd6a8c0
author Eric Biggers <ebiggers@google.com> 1639011892 -0800
committer Eric Biggers <ebiggers@google.com> 1639075796 -0800

binder: use wake_up_pollfree()

wake_up_poll() uses nr_exclusive=1, so it's not guaranteed to wake up
all exclusive waiters.  Yet, POLLFREE *must* wake up all waiters.  epoll
and aio poll are fortunately not affected by this, but it's very
fragile.  Thus, the new function wake_up_pollfree() has been introduced.

Convert binder to use wake_up_pollfree().

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Fixes: f5cb779ba163 ("ANDROID: binder: remove waitqueue when thread exits.")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211209010455.42744-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>