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net: add {READ|WRITE}_ONCE() annotations on ->rskq_accept_head

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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: fff1f3001c ("tcp: add a spinlock to protect struct request_sock_queue")
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>
This commit is contained in:
Eric Dumazet 2019-10-09 14:51:20 -07:00 • committed by Jakub Kicinski
commit 60b173ca3d
3 changed files with 4 additions and 4 deletions
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2
drivers/xen/pvcalls-back.c
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@ -775,7 +775,7 @@ static int pvcalls_back_poll(struct xenbus_device *dev,
mappass->reqcopy = *req;
icsk = inet_csk(mappass->sock->sk);
queue = &icsk->icsk_accept_queue;
data = queue->rskq_accept_head != NULL;
data = READ_ONCE(queue->rskq_accept_head) != NULL;
if (data) {
mappass->reqcopy.cmd = 0;
ret = 0;