pipe: pass a poll key when waking writers after a resize

pipe_resize_ring() wakes pipe->wr_wait with a NULL key.  ep_poll_callback()
and pollwake() only filter on the registered event mask when a key is
supplied, so every epoll, poll() and select() waiter on the write queue is
woken, whether or not it asked for the event that occurred.

The event is the one the comment above the wakeup already names: more room
for writers.  anon_pipe_write() passes EPOLLOUT | EPOLLWRNORM when waking
the same queue; do the same here.  Writers blocked in
wait_event_interruptible_exclusive() are unaffected, as
autoremove_wake_function() ignores the key.

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20260916-pipe-resize-poll-key-v1-1-0f8f04f7dd5e@debian.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions