[NET]: Detect hardware rx checksum faults correctly

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv4 / ip_gre.c

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 896ce3f8f53addd02db7e6beaaa205a7275da262..4e9c74b54b150b3cec895023b2489d104866c710 100644 (file)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -577,15 +577,16 @@ static int ipgre_rcv(struct sk_buff *skb)
                        goto drop_nolock;
 
                if (flags&GRE_CSUM) {
-                       if (skb->ip_summed == CHECKSUM_HW) {
+                       switch (skb->ip_summed) {
+                       case CHECKSUM_HW:
                                csum = (u16)csum_fold(skb->csum);
-                               if (csum)
-                                       skb->ip_summed = CHECKSUM_NONE;
-                       }
-                       if (skb->ip_summed == CHECKSUM_NONE) {
-                               skb->csum = skb_checksum(skb, 0, skb->len, 0);
+                               if (!csum)
+                                       break;
+                               /* fall through */
+                       case CHECKSUM_NONE:
+                               skb->csum = 0;
+                               csum = __skb_checksum_complete(skb);
                                skb->ip_summed = CHECKSUM_HW;
-                               csum = (u16)csum_fold(skb->csum);
                        }
                        offset += 4;
                }