提交 a080e7bd 编写于 作者: A Alexander Duyck 提交者: David S. Miller

net: Reserve skb headroom and set skb->dev even if using __alloc_skb

When I had inlined __alloc_rx_skb into __netdev_alloc_skb and
__napi_alloc_skb I had overlooked the fact that there was a return in the
__alloc_rx_skb.  As a result we weren't reserving headroom or setting the
skb->dev in certain cases.  This change corrects that by adding a couple of
jump labels to jump to depending on __alloc_skb either succeeding or failing.

Fixes: 9451980a ("net: Use cached copy of pfmemalloc to avoid accessing page")
Reported-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NAlexander Duyck <alexander.h.duyck@redhat.com>
Tested-by: NKevin Hilman <khilman@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 59af132b
......@@ -414,8 +414,12 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int len,
len += NET_SKB_PAD;
if ((len > SKB_WITH_OVERHEAD(PAGE_SIZE)) ||
(gfp_mask & (__GFP_WAIT | GFP_DMA)))
return __alloc_skb(len, gfp_mask, SKB_ALLOC_RX, NUMA_NO_NODE);
(gfp_mask & (__GFP_WAIT | GFP_DMA))) {
skb = __alloc_skb(len, gfp_mask, SKB_ALLOC_RX, NUMA_NO_NODE);
if (!skb)
goto skb_fail;
goto skb_success;
}
len += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
len = SKB_DATA_ALIGN(len);
......@@ -445,9 +449,11 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int len,
skb->pfmemalloc = 1;
skb->head_frag = 1;
skb_success:
skb_reserve(skb, NET_SKB_PAD);
skb->dev = dev;
skb_fail:
return skb;
}
EXPORT_SYMBOL(__netdev_alloc_skb);
......@@ -475,8 +481,12 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len,
len += NET_SKB_PAD + NET_IP_ALIGN;
if ((len > SKB_WITH_OVERHEAD(PAGE_SIZE)) ||
(gfp_mask & (__GFP_WAIT | GFP_DMA)))
return __alloc_skb(len, gfp_mask, SKB_ALLOC_RX, NUMA_NO_NODE);
(gfp_mask & (__GFP_WAIT | GFP_DMA))) {
skb = __alloc_skb(len, gfp_mask, SKB_ALLOC_RX, NUMA_NO_NODE);
if (!skb)
goto skb_fail;
goto skb_success;
}
len += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
len = SKB_DATA_ALIGN(len);
......@@ -499,9 +509,11 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len,
skb->pfmemalloc = 1;
skb->head_frag = 1;
skb_success:
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
skb->dev = napi->dev;
skb_fail:
return skb;
}
EXPORT_SYMBOL(__napi_alloc_skb);
......
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