staging: dgnc: remove struct member magic numbers

Driver uses magic number members within structs, this is an antiquated
method of catching data errors. We don't do things that way any more.

Remove magic number struct members. Remove all checks to magic
numbers.

Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 73 insertions, 77 deletions

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 6376f62c436e..9e98781ca6fe 100644
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -264,14 +264,10 @@ int dgnc_tty_init(struct dgnc_board *brd)
 	for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
 		spin_lock_init(&ch->ch_lock);
 
-		/* Store all our magic numbers */
-		ch->magic = DGNC_CHANNEL_MAGIC;
-		ch->ch_tun.magic = DGNC_UNIT_MAGIC;
 		ch->ch_tun.un_ch = ch;
 		ch->ch_tun.un_type = DGNC_SERIAL;
 		ch->ch_tun.un_dev = i;
 
-		ch->ch_pun.magic = DGNC_UNIT_MAGIC;
 		ch->ch_pun.un_ch = ch;
 		ch->ch_pun.un_type = DGNC_PRINT;
 		ch->ch_pun.un_dev = i + 128;
@@ -351,7 +347,7 @@ static void dgnc_wmove(struct channel_t *ch, char *buf, uint n)
 	int	remain;
 	uint	head;
 
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	head = ch->ch_w_head & WQUEUEMASK;
@@ -401,13 +397,13 @@ void dgnc_input(struct channel_t *ch)
 	int s = 0;
 	int i = 0;
 
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	tp = ch->ch_tun.un_tty;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -424,7 +420,7 @@ void dgnc_input(struct channel_t *ch)
 	 * If the device is not open, or CREAD is off,
 	 * flush input data and return immediately.
 	 */
-	if (!tp || (tp->magic != TTY_MAGIC) ||
+	if (!tp ||
 	    !(ch->ch_tun.un_flags & UN_ISOPEN) ||
 	    !C_CREAD(tp) ||
 	    (ch->ch_tun.un_flags & UN_CLOSING)) {
@@ -547,7 +543,7 @@ void dgnc_carrier(struct channel_t *ch)
 	int virt_carrier = 0;
 	int phys_carrier = 0;
 
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	if (ch->ch_mistat & UART_MSR_DCD)
@@ -771,7 +767,7 @@ void dgnc_wakeup_writes(struct channel_t *ch)
 	int qlen = 0;
 	unsigned long flags;
 
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -1163,7 +1159,7 @@ static int dgnc_block_til_ready(struct tty_struct *tty,
 /* Hangup the port.  Like a close, but don't wait for output to drain. */
 static void dgnc_tty_hangup(struct tty_struct *tty)
 {
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	/* flush the transmit queues */
@@ -1177,19 +1173,19 @@ static void dgnc_tty_close(struct tty_struct *tty, struct file *file)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -1322,11 +1318,11 @@ static int dgnc_tty_chars_in_buffer(struct tty_struct *tty)
 		return 0;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return 0;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return 0;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -1398,11 +1394,11 @@ static int dgnc_tty_write_room(struct tty_struct *tty)
 		return 0;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return 0;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return 0;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -1469,11 +1465,11 @@ static int dgnc_tty_write(struct tty_struct *tty,
 		return 0;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return 0;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return 0;
 
 	if (!count)
@@ -1584,15 +1580,15 @@ static int dgnc_tty_tiocmget(struct tty_struct *tty)
 	unsigned char mstat = 0;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return -EIO;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return -EIO;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return -EIO;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -1628,19 +1624,19 @@ static int dgnc_tty_tiocmset(struct tty_struct *tty,
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return -EIO;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return -EIO;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return -EIO;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return -EIO;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -1672,19 +1668,19 @@ static int dgnc_tty_send_break(struct tty_struct *tty, int msec)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return -EIO;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return -EIO;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return -EIO;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return -EIO;
 
 	if (msec < 0)
@@ -1706,19 +1702,19 @@ static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 	struct channel_t *ch;
 	struct un_t *un;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return;
 
 	bd->bd_ops->drain(tty, 0);
@@ -1732,19 +1728,19 @@ static void dgnc_tty_send_xchar(struct tty_struct *tty, char c)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -1759,7 +1755,7 @@ static inline int dgnc_get_mstat(struct channel_t *ch)
 	unsigned long flags;
 	int rc;
 
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return -ENXIO;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -1864,15 +1860,15 @@ static int dgnc_tty_digigeta(struct tty_struct *tty,
 	if (!retinfo)
 		return -EFAULT;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return -EFAULT;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return -EFAULT;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return -EFAULT;
 
 	memset(&tmp, 0, sizeof(tmp));
@@ -1897,19 +1893,19 @@ static int dgnc_tty_digiseta(struct tty_struct *tty,
 	struct digi_t new_digi;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return -EFAULT;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return -EFAULT;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return -EFAULT;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return -EFAULT;
 
 	if (copy_from_user(&new_digi, new_info, sizeof(new_digi)))
@@ -1973,19 +1969,19 @@ static void dgnc_tty_set_termios(struct tty_struct *tty,
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -2009,15 +2005,15 @@ static void dgnc_tty_throttle(struct tty_struct *tty)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -2033,15 +2029,15 @@ static void dgnc_tty_unthrottle(struct tty_struct *tty)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -2058,19 +2054,19 @@ static void dgnc_tty_start(struct tty_struct *tty)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -2087,19 +2083,19 @@ static void dgnc_tty_stop(struct tty_struct *tty)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -2127,19 +2123,19 @@ static void dgnc_tty_flush_chars(struct tty_struct *tty)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -2156,15 +2152,15 @@ static void dgnc_tty_flush_buffer(struct tty_struct *tty)
 	struct un_t *un;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return;
 
 	spin_lock_irqsave(&ch->ch_lock, flags);
@@ -2210,19 +2206,19 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
 	unsigned long flags;
 	void __user *uarg = (void __user *)arg;
 
-	if (!tty || tty->magic != TTY_MAGIC)
+	if (!tty)
 		return -ENODEV;
 
 	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
+	if (!un)
 		return -ENODEV;
 
 	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
+	if (!ch)
 		return -ENODEV;
 
 	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
+	if (!bd)
 		return -ENODEV;
 
 	ch_bd_ops = bd->bd_ops;