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Diffstat (limited to 'net/xdp/xsk.c')
-rw-r--r--net/xdp/xsk.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index a03268454a27..45f3b528dc09 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -669,6 +669,8 @@ static int xsk_mmap(struct file *file, struct socket *sock,
if (!umem)
return -EINVAL;
+ /* Matches the smp_wmb() in XDP_UMEM_REG */
+ smp_rmb();
if (offset == XDP_UMEM_PGOFF_FILL_RING)
q = READ_ONCE(umem->fq);
else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING)
@@ -678,6 +680,8 @@ static int xsk_mmap(struct file *file, struct socket *sock,
if (!q)
return -EINVAL;
+ /* Matches the smp_wmb() in xsk_init_queue */
+ smp_rmb();
qpg = virt_to_head_page(q->ring);
if (size > (PAGE_SIZE << compound_order(qpg)))
return -EINVAL;