TTY: isdn/gigaset, do not set tty->driver_data to NULL

Close the window in open where driver_data is reset to NULL on each
open. It could cause other processes to get invalid retval from the
tty->ops operations because of the checks all over the code.

With this change we may do other cleanups. Now, the only valid check
for tty->driver_data != NULL is in close. This can happen only if open
fails at gigaset_get_cs_by_tty or try_module_get. The rest of checks
in various tty->ops->* are invalid as driver_data cannot be NULL
there. The same holds for cs->open_count. So remove them.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Hansjoerg Lipp <hjlipp@web.de>
Cc: Tilman Schmidt <tilman@imap.cc>
Cc: gigaset307x-common@lists.sourceforge.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 14 insertions, 91 deletions

diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c
index 648260b07f1a..8ff50b056285 100644
--- a/drivers/isdn/gigaset/interface.c
+++ b/drivers/isdn/gigaset/interface.c
@@ -151,8 +151,6 @@ static int if_open(struct tty_struct *tty, struct file *filp)
         gig_dbg(DEBUG_IF, "%d+%d: %s()",
                 tty->driver->minor_start, tty->index, __func__);
 
-        tty->driver_data = NULL;
-
         cs = gigaset_get_cs_by_tty(tty);
         if (!cs || !try_module_get(cs->driver->owner))
                 return -ENODEV;
@@ -178,12 +176,11 @@ static int if_open(struct tty_struct *tty, struct file *filp)
 
 static void if_close(struct tty_struct *tty, struct file *filp)
 {
-        struct cardstate *cs;
+        struct cardstate *cs = tty->driver_data;
         unsigned long flags;
 
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
+        if (!cs) { /* happens if we didn't find cs in open */
+                printk(KERN_DEBUG "%s: no cardstate\n", __func__);
                 return;
         }
 
@@ -211,18 +208,12 @@ static void if_close(struct tty_struct *tty, struct file *filp)
 static int if_ioctl(struct tty_struct *tty,
                     unsigned int cmd, unsigned long arg)
 {
-        struct cardstate *cs;
+        struct cardstate *cs = tty->driver_data;
         int retval = -ENODEV;
         int int_arg;
         unsigned char buf[6];
         unsigned version[4];
 
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return -ENODEV;
-        }
-
         gig_dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __func__, cmd);
 
         if (mutex_lock_interruptible(&cs->mutex))
@@ -231,9 +222,7 @@ static int if_ioctl(struct tty_struct *tty,
         if (!cs->connected) {
                 gig_dbg(DEBUG_IF, "not connected");
                 retval = -ENODEV;
-        } else if (!cs->open_count)
-                dev_warn(cs->dev, "%s: device not opened\n", __func__);
-        else {
+        } else {
                 retval = 0;
                 switch (cmd) {
                 case GIGASET_REDIR:
@@ -285,15 +274,9 @@ static int if_ioctl(struct tty_struct *tty,
 
 static int if_tiocmget(struct tty_struct *tty)
 {
-        struct cardstate *cs;
+        struct cardstate *cs = tty->driver_data;
         int retval;
 
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return -ENODEV;
-        }
-
         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 
         if (mutex_lock_interruptible(&cs->mutex))
@@ -309,16 +292,10 @@ static int if_tiocmget(struct tty_struct *tty)
 static int if_tiocmset(struct tty_struct *tty,
                        unsigned int set, unsigned int clear)
 {
-        struct cardstate *cs;
+        struct cardstate *cs = tty->driver_data;
         int retval;
         unsigned mc;
 
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return -ENODEV;
-        }
-
         gig_dbg(DEBUG_IF, "%u: %s(0x%x, 0x%x)",
                 cs->minor_index, __func__, set, clear);
 
@@ -341,16 +318,10 @@ static int if_tiocmset(struct tty_struct *tty,
 
 static int if_write(struct tty_struct *tty, const unsigned char *buf, int count)
 {
-        struct cardstate *cs;
+        struct cardstate *cs = tty->driver_data;
         struct cmdbuf_t *cb;
         int retval;
 
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return -ENODEV;
-        }
-
         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 
         if (mutex_lock_interruptible(&cs->mutex))
@@ -361,11 +332,6 @@ static int if_write(struct tty_struct *tty, const unsigned char *buf, int count)
                 retval = -ENODEV;
                 goto done;
         }
-        if (!cs->open_count) {
-                dev_warn(cs->dev, "%s: device not opened\n", __func__);
-                retval = -ENODEV;
-                goto done;
-        }
         if (cs->mstate != MS_LOCKED) {
                 dev_warn(cs->dev, "can't write to unlocked device\n");
                 retval = -EBUSY;
@@ -397,15 +363,9 @@ done:
 
 static int if_write_room(struct tty_struct *tty)
 {
-        struct cardstate *cs;
+        struct cardstate *cs = tty->driver_data;
         int retval = -ENODEV;
 
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return -ENODEV;
-        }
-
         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 
         if (mutex_lock_interruptible(&cs->mutex))
@@ -414,9 +374,7 @@ static int if_write_room(struct tty_struct *tty)
         if (!cs->connected) {
                 gig_dbg(DEBUG_IF, "not connected");
                 retval = -ENODEV;
-        } else if (!cs->open_count)
-                dev_warn(cs->dev, "%s: device not opened\n", __func__);
-        else if (cs->mstate != MS_LOCKED) {
+        } else if (cs->mstate != MS_LOCKED) {
                 dev_warn(cs->dev, "can't write to unlocked device\n");
                 retval = -EBUSY;
         } else
@@ -429,23 +387,15 @@ static int if_write_room(struct tty_struct *tty)
 
 static int if_chars_in_buffer(struct tty_struct *tty)
 {
-        struct cardstate *cs;
+        struct cardstate *cs = tty->driver_data;
         int retval = 0;
 
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return 0;
-        }
-
         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 
         mutex_lock(&cs->mutex);
 
         if (!cs->connected)
                 gig_dbg(DEBUG_IF, "not connected");
-        else if (!cs->open_count)
-                dev_warn(cs->dev, "%s: device not opened\n", __func__);
         else if (cs->mstate != MS_LOCKED)
                 dev_warn(cs->dev, "can't write to unlocked device\n");
         else
@@ -458,13 +408,7 @@ static int if_chars_in_buffer(struct tty_struct *tty)
 
 static void if_throttle(struct tty_struct *tty)
 {
-        struct cardstate *cs;
-
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return;
-        }
+        struct cardstate *cs = tty->driver_data;
 
         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 
@@ -472,8 +416,6 @@ static void if_throttle(struct tty_struct *tty)
 
         if (!cs->connected)
                 gig_dbg(DEBUG_IF, "not connected");     /* nothing to do */
-        else if (!cs->open_count)
-                dev_warn(cs->dev, "%s: device not opened\n", __func__);
         else
                 gig_dbg(DEBUG_IF, "%s: not implemented\n", __func__);
 
@@ -482,13 +424,7 @@ static void if_throttle(struct tty_struct *tty)
 
 static void if_unthrottle(struct tty_struct *tty)
 {
-        struct cardstate *cs;
-
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return;
-        }
+        struct cardstate *cs = tty->driver_data;
 
         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 
@@ -496,8 +432,6 @@ static void if_unthrottle(struct tty_struct *tty)
 
         if (!cs->connected)
                 gig_dbg(DEBUG_IF, "not connected");     /* nothing to do */
-        else if (!cs->open_count)
-                dev_warn(cs->dev, "%s: device not opened\n", __func__);
         else
                 gig_dbg(DEBUG_IF, "%s: not implemented\n", __func__);
 
@@ -506,18 +440,12 @@ static void if_unthrottle(struct tty_struct *tty)
 
 static void if_set_termios(struct tty_struct *tty, struct ktermios *old)
 {
-        struct cardstate *cs;
+        struct cardstate *cs = tty->driver_data;
         unsigned int iflag;
         unsigned int cflag;
         unsigned int old_cflag;
         unsigned int control_state, new_state;
 
-        cs = (struct cardstate *) tty->driver_data;
-        if (!cs) {
-                pr_err("%s: no cardstate\n", __func__);
-                return;
-        }
-
         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 
         mutex_lock(&cs->mutex);
@@ -527,11 +455,6 @@ static void if_set_termios(struct tty_struct *tty, struct ktermios *old)
                 goto out;
         }
 
-        if (!cs->open_count) {
-                dev_warn(cs->dev, "%s: device not opened\n", __func__);
-                goto out;
-        }
-
         iflag = tty->termios->c_iflag;
         cflag = tty->termios->c_cflag;
         old_cflag = old ? old->c_cflag : cflag;