[PATCH 3/3] staging: dgnc: removes redundant null check and change

[Daeseok Youn]

The dgnc_set_modem_info() used only channel_t variable.
Any other variables were used only for checking NULL.

So fist parameter changed from "tty_struct" to "channel_t" and
useless NULL checks and variables are removed.

Signed-off-by: Daeseok Youn <daeseok.youn@xxxxxxxxx>
---
 drivers/staging/dgnc/dgnc_tty.c | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 5119bcb..51c37ee 100644
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -100,7 +100,7 @@ static void dgnc_tty_unthrottle(struct tty_struct *tty);
 static void dgnc_tty_flush_chars(struct tty_struct *tty);
 static void dgnc_tty_flush_buffer(struct tty_struct *tty);
 static void dgnc_tty_hangup(struct tty_struct *tty);
-static int dgnc_set_modem_info(struct tty_struct *tty, unsigned int command,
+static int dgnc_set_modem_info(struct channel_t *ch, unsigned int command,
 			       unsigned int __user *value);
 static int dgnc_get_modem_info(struct channel_t *ch,
 			       unsigned int __user *value);
@@ -2015,32 +2015,14 @@ static int dgnc_get_modem_info(struct channel_t *ch,
  *
  * Set modem signals, called by ld.
  */
-static int dgnc_set_modem_info(struct tty_struct *tty,
+static int dgnc_set_modem_info(struct channel_t *ch,
 			       unsigned int command,
 			       unsigned int __user *value)
 {
-	struct dgnc_board *bd;
-	struct channel_t *ch;
-	struct un_t *un;
 	int ret = -ENXIO;
 	unsigned int arg = 0;
 	unsigned long flags;
 
-	if (!tty || tty->magic != TTY_MAGIC)
-		return ret;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGNC_UNIT_MAGIC)
-		return ret;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
-		return ret;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGNC_BOARD_MAGIC)
-		return ret;
-
 	ret = get_user(arg, value);
 	if (ret)
 		return ret;
@@ -2607,7 +2589,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
 	case TIOCMBIC:
 	case TIOCMSET:
 		spin_unlock_irqrestore(&ch->ch_lock, flags);
-		return dgnc_set_modem_info(tty, cmd, uarg);
+		return dgnc_set_modem_info(ch, cmd, uarg);
 
 		/*
 		 * Here are any additional ioctl's that we want to implement
-- 
2.8.2