]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
signalfd: use wake_up_pollfree()
authorEric Biggers <ebiggers@google.com>
Thu, 9 Dec 2021 01:04:53 +0000 (17:04 -0800)
committerEric Biggers <ebiggers@google.com>
Thu, 9 Dec 2021 18:49:56 +0000 (10:49 -0800)
commit9537bae0da1f8d1e2361ab6d0479e8af7824e160
tree5afede8161feeef64b89b0eb31fcd12aaa7a2955
parenta880b28a71e39013e357fd3adccd1d8a31bc69a8
signalfd: 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 signalfd to use wake_up_pollfree().

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Fixes: d80e731ecab4 ("epoll: introduce POLLFREE to flush ->signalfd_wqh before kfree()")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211209010455.42744-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
fs/signalfd.c