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Subject[PATCH 3.16 71/87] net/af_iucv: remove GFP_DMA restriction for HiperTransport
3.16.75-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Julian Wiedmann <jwi@linux.ibm.com>

commit fdbf6326912d578a31ac4ca0933c919eadf1d54c upstream.

af_iucv sockets over z/VM IUCV require that their skbs are allocated
in DMA memory. This restriction doesn't apply to connections over
HiperSockets. So only set this limit for z/VM IUCV sockets, thereby
increasing the likelihood that the large (and linear!) allocations for
HiperTransport messages succeed.

Fixes: 3881ac441f64 ("af_iucv: add HiperSockets transport")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
net/iucv/af_iucv.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -568,7 +568,6 @@ static struct sock *iucv_sock_alloc(stru

sk->sk_destruct = iucv_sock_destruct;
sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
- sk->sk_allocation = GFP_DMA;

sock_reset_flag(sk, SOCK_ZAPPED);

@@ -762,6 +761,7 @@ vm_bind:
memcpy(iucv->src_user_id, iucv_userid, 8);
sk->sk_state = IUCV_BOUND;
iucv->transport = AF_IUCV_TRANS_IUCV;
+ sk->sk_allocation |= GFP_DMA;
if (!iucv->msglimit)
iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
goto done_unlock;
@@ -786,6 +786,8 @@ static int iucv_sock_autobind(struct soc
return -EPROTO;

memcpy(iucv->src_user_id, iucv_userid, 8);
+ iucv->transport = AF_IUCV_TRANS_IUCV;
+ sk->sk_allocation |= GFP_DMA;

write_lock_bh(&iucv_sk_list.lock);
__iucv_auto_name(iucv);
@@ -1737,6 +1739,8 @@ static int iucv_callback_connreq(struct

niucv = iucv_sk(nsk);
iucv_sock_init(nsk, sk);
+ niucv->transport = AF_IUCV_TRANS_IUCV;
+ nsk->sk_allocation |= GFP_DMA;

/* Set the new iucv_sock */
memcpy(niucv->dst_name, ipuser + 8, 8);
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