5 files changed, 16 insertions, 6 deletions

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 0fa2e4a0835d..c1ab303455cf 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -879,8 +879,8 @@ static int isicom_open(struct tty_struct *tty, struct file *filp)
         if (tport == NULL)
                 return -ENODEV;
         port = container_of(tport, struct isi_port, port);
-        card = &isi_card[BOARD(tty->index)];
 
+        tty->driver_data = port;
         return tty_port_open(tport, tty, filp);
 }
 
@@ -936,7 +936,12 @@ static void isicom_shutdown(struct tty_port *port)
 static void isicom_close(struct tty_struct *tty, struct file *filp)
 {
         struct isi_port *ip = tty->driver_data;
-        struct tty_port *port = &ip->port;
+        struct tty_port *port;
+
+        if (ip == NULL)
+                return;
+
+        port = &ip->port;
         if (isicom_paranoia_check(ip, tty->name, "isicom_close"))
                 return;
         tty_port_close(port, tty, filp);
diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c
index 4cd6c527ee41..4e395c956a09 100644
--- a/drivers/char/istallion.c
+++ b/drivers/char/istallion.c
@@ -827,6 +827,8 @@ static int stli_open(struct tty_struct *tty, struct file *filp)
                 return -ENODEV;
         if (portp->devnr < 1)
                 return -ENODEV;
+
+        tty->driver_data = portp;
         return tty_port_open(&portp->port, tty, filp);
 }
 
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 47023053ee85..d2692d443f7b 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -1011,6 +1011,7 @@ static int mxser_open(struct tty_struct *tty, struct file *filp)
         if (!info->ioaddr)
                 return -ENODEV;
 
+        tty->driver_data = info;
         return tty_port_open(&info->port, tty, filp);
 }
 
@@ -1074,7 +1075,7 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
         struct mxser_port *info = tty->driver_data;
         struct tty_port *port = &info->port;
 
-        if (tty->index == MXSER_PORTS)
+        if (tty->index == MXSER_PORTS || info == NULL)
                 return;
         if (tty_port_close_start(port, tty, filp) == 0)
                 return;
diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c
index 0a8d1e56c993..b02332a5412f 100644
--- a/drivers/char/riscom8.c
+++ b/drivers/char/riscom8.c
@@ -909,6 +909,7 @@ static int rc_open(struct tty_struct *tty, struct file *filp)
         if (error)
                 return error;
 
+        tty->driver_data = port;
         return tty_port_open(&port->port, tty, filp);
 }
 
diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 0e511d61f544..6049fd731924 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -724,7 +724,6 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
 {
         struct stlport  *portp;
         struct stlbrd   *brdp;
-        struct tty_port *port;
         unsigned int    minordev, brdnr, panelnr;
         int             portnr;
 
@@ -754,7 +753,8 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
         portp = brdp->panels[panelnr]->ports[portnr];
         if (portp == NULL)
                 return -ENODEV;
-        port = &portp->port;
+
+        tty->driver_data = portp;
         return tty_port_open(&portp->port, tty, filp);
 
 }
@@ -841,7 +841,8 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
         pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp);
 
         portp = tty->driver_data;
-        BUG_ON(portp == NULL);
+        if(portp == NULL)
+                return;
         tty_port_close(&portp->port, tty, filp);
 }