From: Paul Barker Date: Tue, 15 Oct 2024 13:36:28 +0000 (+0100) Subject: net: ravb: Combine if conditions in RX csum validation X-Git-Tag: v6.13-rc1~135^2~285 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5a2d973e36061cbf8d1ba00a9294244522715e53;p=thirdparty%2Fkernel%2Flinux.git net: ravb: Combine if conditions in RX csum validation We can merge the two if conditions on skb_is_nonlinear(). Since skb_frag_size_sub() and skb_trim() do not free memory, it is still safe to access the trimmed bytes at the end of the packet after these calls. Reviewed-by: Sergey Shtylyov Signed-off-by: Paul Barker Signed-off-by: Andrew Lunn --- diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 4bc2532706c20..2f584c353c781 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -750,7 +750,6 @@ static void ravb_rx_csum_gbeth(struct sk_buff *skb) { struct skb_shared_info *shinfo = skb_shinfo(skb); __wsum csum_proto; - skb_frag_t *last_frag; u8 *hw_csum; /* The hardware checksum status is contained in sizeof(__sum16) * 2 = 4 @@ -766,21 +765,19 @@ static void ravb_rx_csum_gbeth(struct sk_buff *skb) return; if (skb_is_nonlinear(skb)) { - last_frag = &shinfo->frags[shinfo->nr_frags - 1]; + skb_frag_t *last_frag = &shinfo->frags[shinfo->nr_frags - 1]; + hw_csum = skb_frag_address(last_frag) + skb_frag_size(last_frag); + skb_frag_size_sub(last_frag, 2 * sizeof(__sum16)); } else { hw_csum = skb_tail_pointer(skb); + skb_trim(skb, skb->len - 2 * sizeof(__sum16)); } hw_csum -= sizeof(__sum16); csum_proto = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum)); - if (skb_is_nonlinear(skb)) - skb_frag_size_sub(last_frag, 2 * sizeof(__sum16)); - else - skb_trim(skb, skb->len - 2 * sizeof(__sum16)); - if (!csum_proto) skb->ip_summed = CHECKSUM_UNNECESSARY; }