From 9092c658bab215b2752fa59d2a36c05b74d1e9e9 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 2 Apr 2010 13:34:49 -0700
Subject: [PATCH] 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>
---
net/core/dev.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index e19cdae49fe..c6b52068d5e 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)
--
2.20.1