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authorEric Dumazet <edumazet@google.com>2019-10-10 00:51:20 +0300
committerJakub Kicinski <jakub.kicinski@netronome.com>2019-10-10 07:34:31 +0300
commit60b173ca3d1cd1782bd0096dc17298ec242f6fb1 (patch)
tree63dcac48023790e1acfb33271d47d5d4132ca55c /drivers/xen/pvcalls-back.c
parent503978aca46124cd714703e180b9c8292ba50ba7 (diff)
downloadlinux-60b173ca3d1cd1782bd0096dc17298ec242f6fb1.tar.xz
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 'drivers/xen/pvcalls-back.c')
-rw-r--r--drivers/xen/pvcalls-back.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index 69a626b0e594..c57c71b7d53d 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -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;