[PATCH net-next] r8169: improve DMA handling in rtl_rx

[Heiner Kallweit]

Move the call to dma_sync_single_for_cpu after calling napi_alloc_skb.
This avoids calling dma_sync_single_for_cpu w/o handing control back
to device if the memory allocation should fail.

Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c 
b/drivers/net/ethernet/realtek/r8169_main.c
index 6182e7d33..faa4041cf 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -5807,16 +5807,15 @@ static int rtl_rx(struct net_device *dev, struct 
rtl8169_private *tp, u32 budget
                                goto release_descriptor;
                        }
 
-                       dma_sync_single_for_cpu(tp_to_dev(tp),
-                                               le64_to_cpu(desc->addr),
-                                               pkt_size, DMA_FROM_DEVICE);
-
                        skb = napi_alloc_skb(&tp->napi, pkt_size);
                        if (unlikely(!skb)) {
                                dev->stats.rx_dropped++;
                                goto release_descriptor;
                        }
 
+                       dma_sync_single_for_cpu(tp_to_dev(tp),
+                                               le64_to_cpu(desc->addr),
+                                               pkt_size, DMA_FROM_DEVICE);
                        prefetch(rx_buf);
                        skb_copy_to_linear_data(skb, rx_buf, pkt_size);
                        skb->tail += pkt_size;
-- 
2.23.0