diff options
| author |   Eric Dumazet <edumazet@google.com> | 2019-10-09 14:51:20 -0700 |
|---|---|---|
| committer |   Jakub Kicinski <jakub.kicinski@netronome.com> | 2019-10-09 21:34:31 -0700 |
| commit | 60b173ca3d1cd1782bd0096dc17298ec242f6fb1 (patch) | |
| tree | 63dcac48023790e1acfb33271d47d5d4132ca55c /include/net | |
| parent | net: avoid possible false sharing in sk_leave_memory_pressure() (diff) | |
| download | linux-dev-60b173ca3d1cd1782bd0096dc17298ec242f6fb1.tar.xz linux-dev-60b173ca3d1cd1782bd0096dc17298ec242f6fb1.zip | |
net: add {READ|WRITE}_ONCE() annotations on ->rskq_accept_head
reqsk_queue_empty() is called from inet_csk_listen_poll() while
other cpus might write ->rskq_accept_head value.
Use {READ|WRITE}_ONCE() to avoid compiler tricks
and potential KCSAN splats.
Fixes: fff1f3001cc5 ("tcp: add a spinlock to protect struct request_sock_queue")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Diffstat (limited to '')
| -rw-r--r-- | include/net/request_sock.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h index fd178d58fa84..cf8b33213bbc 100644 --- a/include/net/request_sock.h +++ b/include/net/request_sock.h @@ -185,7 +185,7 @@ void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req, static inline bool reqsk_queue_empty(const struct request_sock_queue *queue) { - return queue->rskq_accept_head == NULL; + return READ_ONCE(queue->rskq_accept_head) == NULL; } static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue, @@ -197,7 +197,7 @@ static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue req = queue->rskq_accept_head; if (req) { sk_acceptq_removed(parent); - queue->rskq_accept_head = req->dl_next; + WRITE_ONCE(queue->rskq_accept_head, req->dl_next); if (queue->rskq_accept_head == NULL) queue->rskq_accept_tail = NULL; } |