From: Björn Töpel <bjorn.topel@xxxxxxxxx>
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.lemon@xxxxxxxxx>
Fixes: 37b076933a8e ("xsk: add missing write- and data-dependency barrier")
Signed-off-by: Björn Töpel <bjorn.topel@xxxxxxxxx>
---
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
