[PATCH net-next] ftmac100: fix skb truesize underestimation
From: Eric Dumazet <hidden>
Date: 2011-10-13 21:20:12
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
ftmac100 allocates a page per skb fragment. We must account PAGE_SIZE increments on skb->truesize, not the actual frag length. If frame is under 64 bytes, page is freed, so increase truesize only for bigger frames. Signed-off-by: Eric Dumazet <redacted> CC: Po-Yu Chuang <redacted> --- drivers/net/ethernet/faraday/ftmac100.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/faraday/ftmac100.c b/drivers/net/ethernet/faraday/ftmac100.c
index 9bd7746..a127cb2 100644
--- a/drivers/net/ethernet/faraday/ftmac100.c
+++ b/drivers/net/ethernet/faraday/ftmac100.c@@ -439,7 +439,10 @@ static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed) skb_fill_page_desc(skb, 0, page, 0, length); skb->len += length; skb->data_len += length; - skb->truesize += length; + + /* page might be freed in __pskb_pull_tail() */ + if (length > 64) + skb->truesize += PAGE_SIZE; __pskb_pull_tail(skb, min(length, 64)); ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);