From 40c1deaf6c2b42d7ee4e604ba5793cf9da292d96 Mon Sep 17 00:00:00 2001 From: Prashant Sreedharan Date: Wed, 18 Jun 2014 18:38:13 -0700 Subject: [PATCH] tg3: Clear NETIF_F_TSO6 flag before doing software GSO Commit d3f6f3a1d818410c17445bce4f4caab52eb102f1 ("tg3: Prevent page allocation failure during TSO workaround") modified driver logic to use tg3_tso_bug() for any TSO fragment that hits hardware bug conditions thus the patch increased the scope of work for tg3_tso_bug() to cover devices that support NETIF_F_TSO6 as well. Prior to the patch, tg3_tso_bug() would only be used on devices supporting NETIF_F_TSO. A regression was introduced for IPv6 packets requiring the workaround. To properly perform GSO on SKBs with TCPV6 gso_type, we need to call skb_gso_segment() with NETIF_F_TSO6 feature flag cleared, or the function will return NULL and cause a kernel oops as tg3 is not handling a NULL return value. This patch fixes the problem. Signed-off-by: Prashant Sreedharan Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/tg3.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index df2792d..c2ff688 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -7854,8 +7854,8 @@ static int tg3_tso_bug(struct tg3 *tp, struct sk_buff *skb) netif_wake_queue(tp->dev); } - segs = skb_gso_segment(skb, tp->dev->features & ~NETIF_F_TSO); - if (IS_ERR(segs)) + segs = skb_gso_segment(skb, tp->dev->features & ~(NETIF_F_TSO | NETIF_F_TSO6)); + if (IS_ERR(segs) || !segs) goto tg3_tso_bug_end; do { -- 2.7.4