diff --git a/net/core/user_dma.c b/net/core/user_dma.c
index 0ad1cd57bc393b126e5cecbbb0f5638b34d73d97..c77aff9c6eb3cc76fab911cdca097cc5add01d8c 100644
--- a/net/core/user_dma.c
+++ b/net/core/user_dma.c
@@ -75,7 +75,7 @@ int dma_skb_copy_datagram_iovec(struct dma_chan *chan,
 
 		end = start + skb_shinfo(skb)->frags[i].size;
 		copy = end - offset;
-		if ((copy = end - offset) > 0) {
+		if (copy > 0) {
 			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 			struct page *page = frag->page;