pty: Coding style and polish

We've done the heavy lifting now its time to mop up a bit
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/pty.c

@@ -8,10 +8,12 @@
  *  Added TTY_DO_WRITE_WAKEUP to enable n_tty to send POLL_OUT to
  *      waiting writers -- Sapan Bhatia <sapan@corewars.org>
  *
- *
+ *  When reading this code see also fs/devpts. In particular note that the
+ *  driver_data field is used by the devpts side as a binding to the devpts
+ *  inode.
  */
 
-#include <linux/module.h>	/* For EXPORT_SYMBOL */
+#include <linux/module.h>
 
 #include <linux/errno.h>
 #include <linux/interrupt.h>
@@ -24,26 +26,24 @@
 #include <linux/init.h>
 #include <linux/sysctl.h>
 #include <linux/device.h>
-
-#include <asm/uaccess.h>
-#include <asm/system.h>
+#include <linux/uaccess.h>
 #include <linux/bitops.h>
 #include <linux/devpts_fs.h>
 
+#include <asm/system.h>
+
 /* These are global because they are accessed in tty_io.c */
 #ifdef CONFIG_UNIX98_PTYS
 struct tty_driver *ptm_driver;
 static struct tty_driver *pts_driver;
 #endif
 
-static void pty_close(struct tty_struct * tty, struct file * filp)
+static void pty_close(struct tty_struct *tty, struct file *filp)
 {
-	if (!tty)
-		return;
-	if (tty->driver->subtype == PTY_TYPE_MASTER) {
-		if (tty->count > 1)
-			printk("master pty_close: count = %d!!\n", tty->count);
-	} else {
+	BUG_ON(!tty);
+	if (tty->driver->subtype == PTY_TYPE_MASTER)
+		WARN_ON(tty->count > 1);
+	else {
 		if (tty->count > 2)
 			return;
 	}
@@ -76,7 +76,7 @@ static void pty_close(struct tty_struct * tty, struct file * filp)
  * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
  * for the pty buffer to be drained.
  */
-static void pty_unthrottle(struct tty_struct * tty)
+static void pty_unthrottle(struct tty_struct *tty)
 {
 	struct tty_struct *o_tty = tty->link;
 
@@ -101,7 +101,8 @@ static void pty_unthrottle(struct tty_struct * tty)
  * not our partners. We can't just take the other one blindly without
  * risking deadlocks.
  */
-static int pty_write(struct tty_struct * tty, const unsigned char *buf, int count)
+static int pty_write(struct tty_struct *tty, const unsigned char *buf,
+								int count)
 {
 	struct tty_struct *to = tty->link;
 	int	c;
@@ -156,21 +157,22 @@ static int pty_chars_in_buffer(struct tty_struct *tty)
 	/* The ldisc must report 0 if no characters available to be read */
 	count = to->ldisc.ops->chars_in_buffer(to);
 
-	if (tty->driver->subtype == PTY_TYPE_SLAVE) return count;
+	if (tty->driver->subtype == PTY_TYPE_SLAVE)
+		return count;
 
 	/* Master side driver ... if the other side's read buffer is less than
 	 * half full, return 0 to allow writers to proceed; otherwise return
 	 * the count.  This leaves a comfortable margin to avoid overflow,
 	 * and still allows half a buffer's worth of typed-ahead commands.
 	 */
-	return ((count < N_TTY_BUF_SIZE/2) ? 0 : count);
+	return (count < N_TTY_BUF_SIZE/2) ? 0 : count;
 }
 
 /* Set the lock flag on a pty */
-static int pty_set_lock(struct tty_struct *tty, int __user * arg)
+static int pty_set_lock(struct tty_struct *tty, int __user *arg)
 {
 	int val;
-	if (get_user(val,arg))
+	if (get_user(val, arg))
 		return -EFAULT;
 	if (val)
 		set_bit(TTY_PTY_LOCK, &tty->flags);
@@ -198,7 +200,7 @@ static void pty_flush_buffer(struct tty_struct *tty)
 	}
 }
 
-static int pty_open(struct tty_struct *tty, struct file * filp)
+static int pty_open(struct tty_struct *tty, struct file *filp)
 {
 	int	retval = -ENODEV;
 
@@ -221,7 +223,8 @@ static int pty_open(struct tty_struct *tty, struct file * filp)
 	return retval;
 }
 
-static void pty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+static void pty_set_termios(struct tty_struct *tty,
+					struct ktermios *old_termios)
 {
 	tty->termios->c_cflag &= ~(CSIZE | PARENB);
 	tty->termios->c_cflag |= (CS8 | CREAD);
@@ -381,9 +384,9 @@ static inline void legacy_pty_init(void) { }
  * Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly.
  */
 int pty_limit = NR_UNIX98_PTY_DEFAULT;
-static int pty_limit_min = 0;
+static int pty_limit_min;
 static int pty_limit_max = NR_UNIX98_PTY_MAX;
-static int pty_count = 0;
+static int pty_count;
 
 static struct cdev ptmx_cdev;
 
@@ -537,11 +540,10 @@ static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
 	pty_count++;
 	return 0;
 free_mem_out:
-	kfree(o_tty->termios);
+	pty_unix98_shutdown(o_tty);
 	module_put(o_tty->driver->owner);
 	free_tty_struct(o_tty);
-	kfree(tty->termios_locked);
-	kfree(tty->termios);
+	pty_unix98_shutdown(tty);
 	free_tty_struct(tty);
 	module_put(driver->owner);
 	return -ENOMEM;