[PATCH bpf-next v2 1/4] xsk: avoid store-tearing when assigning queues

[Björn Töpel]

From: Björn Töpel <bjorn.to...@intel.com>

Use WRITE_ONCE when doing the store of tx, rx, fq, and cq, to avoid
potential store-tearing. These members are read outside of the control
mutex in the mmap implementation.

Acked-by: Jonathan Lemon <jonathan.le...@gmail.com>
Fixes: 37b076933a8e ("xsk: add missing write- and data-dependency barrier")
Signed-off-by: Björn Töpel <bjorn.to...@intel.com>
---
 net/xdp/xsk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index ee4428a892fa..f3351013c2a5 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -409,7 +409,7 @@ static int xsk_init_queue(u32 entries, struct xsk_queue 
**queue,
 
        /* Make sure queue is ready before it can be seen by others */
        smp_wmb();
-       *queue = q;
+       WRITE_ONCE(*queue, q);
        return 0;
 }
 
-- 
2.20.1