net: illegal_highdma() fix

Followup to commit 5acbbd428db47b12f137a8a2aa96b3c0a96b744e
(net: change illegal_highdma to use dma_mask)

If dev->dev.parent is NULL, we should not try to dereference it.

Dont force inline illegal_highdma() as its pretty big now.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index e19cdae49fef..c6b52068d5ec 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1801,7 +1801,7 @@ EXPORT_SYMBOL(netdev_rx_csum_fault);
  * 2. No high memory really exists on this machine.
  */
 
-static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
+static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
 {
 #ifdef CONFIG_HIGHMEM
         int i;
@@ -1814,6 +1814,8 @@ static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
         if (PCI_DMA_BUS_IS_PHYS) {
                 struct device *pdev = dev->dev.parent;
 
+                if (!pdev)
+                        return 0;
                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                         dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
                         if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)