2 files changed, 28 insertions, 18 deletions

diff --git a/drivers/net/slip/slhc.c b/drivers/net/slip/slhc.c
index ea90db3c7705..58a69f830d29 100644
--- a/drivers/net/slip/slhc.c
+++ b/drivers/net/slip/slhc.c
@@ -91,8 +91,8 @@ static unsigned short pull16(unsigned char **cpp);
 struct slcompress *
 slhc_init(int rslots, int tslots)
 {
-	register short i;
-	register struct cstate *ts;
+	short i;
+	struct cstate *ts;
 	struct slcompress *comp;
 
 	if (rslots < 0 || rslots > 255 || tslots < 0 || tslots > 255)
@@ -206,7 +206,7 @@ pull16(unsigned char **cpp)
 static long
 decode(unsigned char **cpp)
 {
-	register int x;
+	int x;
 
 	x = *(*cpp)++;
 	if(x == 0){
@@ -227,14 +227,14 @@ int
 slhc_compress(struct slcompress *comp, unsigned char *icp, int isize,
 	unsigned char *ocp, unsigned char **cpp, int compress_cid)
 {
-	register struct cstate *ocs = &(comp->tstate[comp->xmit_oldest]);
-	register struct cstate *lcs = ocs;
-	register struct cstate *cs = lcs->next;
-	register unsigned long deltaS, deltaA;
-	register short changes = 0;
+	struct cstate *ocs = &(comp->tstate[comp->xmit_oldest]);
+	struct cstate *lcs = ocs;
+	struct cstate *cs = lcs->next;
+	unsigned long deltaS, deltaA;
+	short changes = 0;
 	int hlen;
 	unsigned char new_seq[16];
-	register unsigned char *cp = new_seq;
+	unsigned char *cp = new_seq;
 	struct iphdr *ip;
 	struct tcphdr *th, *oth;
 	__sum16 csum;
@@ -486,11 +486,11 @@ uncompressed:
 int
 slhc_uncompress(struct slcompress *comp, unsigned char *icp, int isize)
 {
-	register int changes;
+	int changes;
 	long x;
-	register struct tcphdr *thp;
-	register struct iphdr *ip;
-	register struct cstate *cs;
+	struct tcphdr *thp;
+	struct iphdr *ip;
+	struct cstate *cs;
 	int len, hdrlen;
 	unsigned char *cp = icp;
 
@@ -543,7 +543,7 @@ slhc_uncompress(struct slcompress *comp, unsigned char *icp, int isize)
 	switch(changes & SPECIALS_MASK){
 	case SPECIAL_I:		/* Echoed terminal traffic */
 		{
-		register short i;
+		short i;
 		i = ntohs(ip->tot_len) - hdrlen;
 		thp->ack_seq = htonl( ntohl(thp->ack_seq) + i);
 		thp->seq = htonl( ntohl(thp->seq) + i);
@@ -637,7 +637,7 @@ bad:
 int
 slhc_remember(struct slcompress *comp, unsigned char *icp, int isize)
 {
-	register struct cstate *cs;
+	struct cstate *cs;
 	unsigned ihl;
 
 	unsigned char index;
diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c
index cac64b96d545..6f4d7ba8b109 100644
--- a/drivers/net/slip/slip.c
+++ b/drivers/net/slip/slip.c
@@ -452,12 +452,19 @@ static void slip_transmit(struct work_struct *work)
  */
 static void slip_write_wakeup(struct tty_struct *tty)
 {
-	struct slip *sl = tty->disc_data;
+	struct slip *sl;
+
+	rcu_read_lock();
+	sl = rcu_dereference(tty->disc_data);
+	if (!sl)
+		goto out;
 
 	schedule_work(&sl->tx_work);
+out:
+	rcu_read_unlock();
 }
 
-static void sl_tx_timeout(struct net_device *dev)
+static void sl_tx_timeout(struct net_device *dev, unsigned int txqueue)
 {
 	struct slip *sl = netdev_priv(dev);
 
@@ -855,6 +862,8 @@ err_free_chan:
 	sl->tty = NULL;
 	tty->disc_data = NULL;
 	clear_bit(SLF_INUSE, &sl->flags);
+	sl_free_netdev(sl->dev);
+	free_netdev(sl->dev);
 
 err_exit:
 	rtnl_unlock();
@@ -880,10 +889,11 @@ static void slip_close(struct tty_struct *tty)
 		return;
 
 	spin_lock_bh(&sl->lock);
-	tty->disc_data = NULL;
+	rcu_assign_pointer(tty->disc_data, NULL);
 	sl->tty = NULL;
 	spin_unlock_bh(&sl->lock);
 
+	synchronize_rcu();
 	flush_work(&sl->tx_work);
 
 	/* VSV = very important to remove timers */