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Subject[PATCH 05/15 RESEND] staging: dgnc: removes redundant null check and change
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 <>
RESEND: This patch was not merged for a long time, if there is any reason
why this patch could NOT be merged into staging tree, let me know.
There were no comment for this patch.
I cannot understand why this patch have to wait long time to merge.
And I also sent emails to mailing-lists for reminding this patch...
please let me know, what is the problem to merge this patch into staging tree.

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 b33b07c..e4c6c3f 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);
@@ -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,
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
 \ /
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