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sctp: Do not wake readers in __sctp_write_space() 

[ Upstream commit af295892a7abbf05a3c2ba7abc4d81bb448623d6 ]

Function __sctp_write_space() doesn't set poll key, which leads to
ep_poll_callback() waking up all waiters, not only these waiting
for the socket being writable. Set the key properly using
wake_up_interruptible_poll(), which is preferred over the sync
variant, as writers are not woken up before at least half of the
queue is available. Also, TCP does the same.

Signed-off-by: Petr Malat <oss@malat.biz>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20250516081727.1361451-1-oss@malat.biz
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit a620f66675e56ed43ef2eb8bc975a754e02c91a6)
This commit is contained in:
Petr Malat 2025-05-16 10:17:28 +02:00 committed by Wentao Guan
parent c7fc60d0d8
commit 86c9da87c1
1 changed files with 2 additions and 1 deletions
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3
net/sctp/socket.c
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@ -9094,7 +9094,8 @@ static void __sctp_write_space(struct sctp_association *asoc)
wq = rcu_dereference(sk->sk_wq);
if (wq) {
if (waitqueue_active(&wq->wait))
wake_up_interruptible(&wq->wait);
wake_up_interruptible_poll(&wq->wait, EPOLLOUT |
EPOLLWRNORM | EPOLLWRBAND);
/* Note that we try to include the Async I/O support
* here by modeling from the current TCP/UDP code.