4 files changed, 20 insertions, 16 deletions

diff --git a/drivers/net/ppp/ppp_async.c b/drivers/net/ppp/ppp_async.c
index 29a0917a81e6..2b66cf301b0e 100644
--- a/drivers/net/ppp/ppp_async.c
+++ b/drivers/net/ppp/ppp_async.c
@@ -101,7 +101,7 @@ static void ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
 			    char *flags, int count);
 static int ppp_async_ioctl(struct ppp_channel *chan, unsigned int cmd,
 			   unsigned long arg);
-static void ppp_async_process(unsigned long arg);
+static void ppp_async_process(struct tasklet_struct *t);
 
 static void async_lcp_peek(struct asyncppp *ap, unsigned char *data,
 			   int len, int inbound);
@@ -179,7 +179,7 @@ ppp_asynctty_open(struct tty_struct *tty)
 	ap->lcp_fcs = -1;
 
 	skb_queue_head_init(&ap->rqueue);
-	tasklet_init(&ap->tsk, ppp_async_process, (unsigned long) ap);
+	tasklet_setup(&ap->tsk, ppp_async_process);
 
 	refcount_set(&ap->refcnt, 1);
 	init_completion(&ap->dead);
@@ -488,9 +488,9 @@ ppp_async_ioctl(struct ppp_channel *chan, unsigned int cmd, unsigned long arg)
  * to the ppp_generic code, and to tell the ppp_generic code
  * if we can accept more output now.
  */
-static void ppp_async_process(unsigned long arg)
+static void ppp_async_process(struct tasklet_struct *t)
 {
-	struct asyncppp *ap = (struct asyncppp *) arg;
+	struct asyncppp *ap = from_tasklet(ap, t, tsk);
 	struct sk_buff *skb;
 
 	/* process received packets */
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 09c27f7773f9..d445ecb1d0c7 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -623,6 +623,7 @@ static int ppp_bridge_channels(struct channel *pch, struct channel *pchb)
 		write_unlock_bh(&pch->upl);
 		return -EALREADY;
 	}
+	refcount_inc(&pchb->file.refcnt);
 	rcu_assign_pointer(pch->bridge, pchb);
 	write_unlock_bh(&pch->upl);
 
@@ -632,19 +633,24 @@ static int ppp_bridge_channels(struct channel *pch, struct channel *pchb)
 		write_unlock_bh(&pchb->upl);
 		goto err_unset;
 	}
+	refcount_inc(&pch->file.refcnt);
 	rcu_assign_pointer(pchb->bridge, pch);
 	write_unlock_bh(&pchb->upl);
 
-	refcount_inc(&pch->file.refcnt);
-	refcount_inc(&pchb->file.refcnt);
-
 	return 0;
 
 err_unset:
 	write_lock_bh(&pch->upl);
+	/* Re-read pch->bridge with upl held in case it was modified concurrently */
+	pchb = rcu_dereference_protected(pch->bridge, lockdep_is_held(&pch->upl));
 	RCU_INIT_POINTER(pch->bridge, NULL);
 	write_unlock_bh(&pch->upl);
 	synchronize_rcu();
+
+	if (pchb)
+		if (refcount_dec_and_test(&pchb->file.refcnt))
+			ppp_destroy_channel(pchb);
+
 	return -EALREADY;
 }
 
diff --git a/drivers/net/ppp/ppp_synctty.c b/drivers/net/ppp/ppp_synctty.c
index 0f338752c38b..86ee5149f4f2 100644
--- a/drivers/net/ppp/ppp_synctty.c
+++ b/drivers/net/ppp/ppp_synctty.c
@@ -90,7 +90,7 @@ static struct sk_buff* ppp_sync_txmunge(struct syncppp *ap, struct sk_buff *);
 static int ppp_sync_send(struct ppp_channel *chan, struct sk_buff *skb);
 static int ppp_sync_ioctl(struct ppp_channel *chan, unsigned int cmd,
 			  unsigned long arg);
-static void ppp_sync_process(unsigned long arg);
+static void ppp_sync_process(struct tasklet_struct *t);
 static int ppp_sync_push(struct syncppp *ap);
 static void ppp_sync_flush_output(struct syncppp *ap);
 static void ppp_sync_input(struct syncppp *ap, const unsigned char *buf,
@@ -177,7 +177,7 @@ ppp_sync_open(struct tty_struct *tty)
 	ap->raccm = ~0U;
 
 	skb_queue_head_init(&ap->rqueue);
-	tasklet_init(&ap->tsk, ppp_sync_process, (unsigned long) ap);
+	tasklet_setup(&ap->tsk, ppp_sync_process);
 
 	refcount_set(&ap->refcnt, 1);
 	init_completion(&ap->dead_cmp);
@@ -480,9 +480,9 @@ ppp_sync_ioctl(struct ppp_channel *chan, unsigned int cmd, unsigned long arg)
  * to the ppp_generic code, and to tell the ppp_generic code
  * if we can accept more output now.
  */
-static void ppp_sync_process(unsigned long arg)
+static void ppp_sync_process(struct tasklet_struct *t)
 {
-	struct syncppp *ap = (struct syncppp *) arg;
+	struct syncppp *ap = from_tasklet(ap, t, tsk);
 	struct sk_buff *skb;
 
 	/* process received packets */
diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c
index ee5058445d06..0fe78826c8fa 100644
--- a/drivers/net/ppp/pptp.c
+++ b/drivers/net/ppp/pptp.c
@@ -278,10 +278,8 @@ static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb)
 		header = (struct pptp_gre_header *)(skb->data);
 
 		/* ack in different place if S = 0 */
-		ack = GRE_IS_SEQ(header->gre_hd.flags) ? header->ack : header->seq;
-
-		ack = ntohl(ack);
-
+		ack = GRE_IS_SEQ(header->gre_hd.flags) ? ntohl(header->ack) :
+							 ntohl(header->seq);
 		if (ack > opt->ack_recv)
 			opt->ack_recv = ack;
 		/* also handle sequence number wrap-around  */
@@ -355,7 +353,7 @@ static int pptp_rcv(struct sk_buff *skb)
 		/* if invalid, discard this packet */
 		goto drop;
 
-	po = lookup_chan(htons(header->call_id), iph->saddr);
+	po = lookup_chan(ntohs(header->call_id), iph->saddr);
 	if (po) {
 		skb_dst_drop(skb);
 		nf_reset_ct(skb);