[3.5.y.z extended stable] Patch "cxgb3: Fix length calculation in write_ofld_wr() on 32-bit" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    cxgb3: Fix length calculation in write_ofld_wr() on 32-bit

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 152ba2e16f36f15bf5355ddbb4204e4b42e208ab Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben at decadent.org.uk>
Date: Sun, 27 Oct 2013 21:02:39 +0000
Subject: cxgb3: Fix length calculation in write_ofld_wr() on 32-bit
 architectures

commit 262e827fe745642589450ae241b7afd3912c3f25 upstream.

The length calculation here is now invalid on 32-bit architectures,
since sk_buff::tail is a pointer and sk_buff::transport_header is
an integer offset:

drivers/net/ethernet/chelsio/cxgb3/sge.c: In function 'write_ofld_wr':
drivers/net/ethernet/chelsio/cxgb3/sge.c:1603:9: warning: passing argument 4 of 'make_sgl' makes integer from pointer without a cast [enabled by default]
         adap->pdev);
         ^
drivers/net/ethernet/chelsio/cxgb3/sge.c:964:28: note: expected 'unsigned int' but argument is of type 'sk_buff_data_t'
 static inline unsigned int make_sgl(const struct sk_buff *skb,
                            ^

Use the appropriate skb accessor functions.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben at decadent.org.uk>
Fixes: 1a37e412a022 ('net: Use 16bits for *_headers fields of struct skbuff')
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/ethernet/chelsio/cxgb3/sge.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb3/sge.c b/drivers/net/ethernet/chelsio/cxgb3/sge.c
index cfb60e1..57d85ee 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/sge.c
@@ -1600,7 +1600,8 @@ static void write_ofld_wr(struct adapter *adap, struct sk_buff *skb,
 	flits = skb_transport_offset(skb) / 8;
 	sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl;
 	sgl_flits = make_sgl(skb, sgp, skb_transport_header(skb),
-			     skb->tail - skb->transport_header,
+			     skb_tail_pointer(skb) -
+			     skb_transport_header(skb),
 			     adap->pdev);
 	if (need_skb_unmap()) {
 		setup_deferred_unmapping(skb, adap->pdev, sgp, sgl_flits);
--
1.8.3.2