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Subject[ 18/41] sfc: Fix assignment of ip_summed for pre-allocated skbs
3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <bhutchings@solarflare.com>

[ Upstream commit ff3bc1e7527504a93710535611b2f812f3bb89bf ]

When pre-allocating skbs for received packets, we set ip_summed =
CHECKSUM_UNNCESSARY. We used to change it back to CHECKSUM_NONE when
the received packet had an incorrect checksum or unhandled protocol.

Commit bc8acf2c8c3e43fcc192762a9f964b3e9a17748b ('drivers/net: avoid
some skb->ip_summed initializations') mistakenly replaced the latter
assignment with a DEBUG-only assertion that ip_summed ==
CHECKSUM_NONE. This assertion is always false, but it seems no-one
has exercised this code path in a DEBUG build.

Fix this by moving our assignment of CHECKSUM_UNNECESSARY into
efx_rx_packet_gro().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/sfc/rx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/sfc/rx.c
+++ b/drivers/net/ethernet/sfc/rx.c
@@ -156,11 +156,10 @@ static int efx_init_rx_buffers_skb(struc
if (unlikely(!skb))
return -ENOMEM;

- /* Adjust the SKB for padding and checksum */
+ /* Adjust the SKB for padding */
skb_reserve(skb, NET_IP_ALIGN);
rx_buf->len = skb_len - NET_IP_ALIGN;
rx_buf->is_page = false;
- skb->ip_summed = CHECKSUM_UNNECESSARY;

rx_buf->dma_addr = pci_map_single(efx->pci_dev,
skb->data, rx_buf->len,
@@ -499,6 +498,7 @@ static void efx_rx_packet_gro(struct efx

EFX_BUG_ON_PARANOID(!checksummed);
rx_buf->u.skb = NULL;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;

gro_result = napi_gro_receive(napi, skb);
}



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