Subject: [PATCH] atm: sk_wmem_alloc initial value is one

From: Eric Dumazet <[email-masked]>
Date: Wed, 17 Jun 2009 13:31:30 +0200

Eric Dumazet a écrit :
> David
> 
> Please find the followup patch I promised yesterday.
> 
> Some review still needed for net/atm, since this protocol
> sets sock_wmem_alloc initial value to 0

Here is last patch of this serie, for net/atm part.

Thank you

[PATCH] atm: sk_wmem_alloc initial value is one

commit 2b85a34e911bf483c27cfdd124aeb1605145dc80 
(net: No more expensive sock_hold()/sock_put() on each tx)
changed initial sk_wmem_alloc value.

This broke net/atm since this protocol assumed a null
initial value. This patch makes necessary changes.

Signed-off-by: Eric Dumazet <[email-masked]>
---
 net/atm/common.c |   12 ++++++------
 net/atm/ioctl.c  |    3 +--
 net/atm/proc.c   |    4 ++--
 net/atm/raw.c    |    2 +-
 4 files changed, 10 insertions(+), 11 deletions(-)
diff --git a/net/atm/common.c b/net/atm/common.c
index d34edbe..c1c9793 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -62,15 +62,15 @@ static struct sk_buff *alloc_tx(struct atm_vcc *vcc,unsigned int size)
 	struct sk_buff *skb;
 	struct sock *sk = sk_atm(vcc);
 
-	if (atomic_read(&sk->sk_wmem_alloc) && !atm_may_send(vcc, size)) {
+	if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) {
 		pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
-			atomic_read(&sk->sk_wmem_alloc), size,
+			sk_wmem_alloc_get(sk), size,
 			sk->sk_sndbuf);
 		return NULL;
 	}
-	while (!(skb = alloc_skb(size,GFP_KERNEL))) schedule();
-	pr_debug("AlTx %d += %d\n", atomic_read(&sk->sk_wmem_alloc),
-		skb->truesize);
+	while (!(skb = alloc_skb(size, GFP_KERNEL)))
+		schedule();
+	pr_debug("AlTx %d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
 	atomic_add(skb->truesize, &sk->sk_wmem_alloc);
 	return skb;
 }
@@ -145,7 +145,7 @@ int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
 	memset(&vcc->local,0,sizeof(struct sockaddr_atmsvc));
 	memset(&vcc->remote,0,sizeof(struct sockaddr_atmsvc));
 	vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
-	atomic_set(&sk->sk_wmem_alloc, 0);
+	atomic_set(&sk->sk_wmem_alloc, 1);
 	atomic_set(&sk->sk_rmem_alloc, 0);
 	vcc->push = NULL;
 	vcc->pop = NULL;
diff --git a/net/atm/ioctl.c b/net/atm/ioctl.c
index 76ed3c8..4da8892 100644
--- a/net/atm/ioctl.c
+++ b/net/atm/ioctl.c
@@ -63,8 +63,7 @@ static int do_vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg
 				error =  -EINVAL;
 				goto done;
 			}
-			error = put_user(sk->sk_sndbuf -
-					 atomic_read(&sk->sk_wmem_alloc),
+			error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk),
 					 (int __user *) argp) ? -EFAULT : 0;
 			goto done;
 		case SIOCINQ:
diff --git a/net/atm/proc.c b/net/atm/proc.c
index e7b3b27..38de5ff 100644
--- a/net/atm/proc.c
+++ b/net/atm/proc.c
@@ -204,8 +204,8 @@ static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
 			seq_printf(seq, "%3d", sk->sk_family);
 	}
 	seq_printf(seq, " %04lx  %5d %7d/%7d %7d/%7d [%d]\n", vcc->flags, sk->sk_err,
-		  atomic_read(&sk->sk_wmem_alloc), sk->sk_sndbuf,
-		  atomic_read(&sk->sk_rmem_alloc), sk->sk_rcvbuf,
+		  sk_wmem_alloc_get(sk), sk->sk_sndbuf,
+		  sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
 		  atomic_read(&sk->sk_refcnt));
 }
 
diff --git a/net/atm/raw.c b/net/atm/raw.c
index b0a2d8c..cbfcc71 100644
--- a/net/atm/raw.c
+++ b/net/atm/raw.c
@@ -33,7 +33,7 @@ static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
 	struct sock *sk = sk_atm(vcc);
 
 	pr_debug("APopR (%d) %d -= %d\n", vcc->vci,
-		atomic_read(&sk->sk_wmem_alloc), skb->truesize);
+		sk_wmem_alloc_get(sk), skb->truesize);
 	atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
 	dev_kfree_skb_any(skb);
 	sk->sk_write_space(sk);