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staging: dgnc: removes redundant null check and change

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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@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daeseok Youn 2016-07-06 15:13:55 +09:00 committed by Greg Kroah-Hartman
parent 18419f77a2
commit c23b48e0ed
1 changed files with 3 additions and 21 deletions
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24
drivers/staging/dgnc/dgnc_tty.c
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@ -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);
@ -2008,32 +2008,14 @@ 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;
@ -2600,7 +2582,7 @@ 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