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staging: dgnc: remove too many traverse pointer 

The "ch->ch_bd" is already assined to "bd" but this is only
for checking null or MAGIC number.
in the dgnc_tty_ioctl function, bd can be used for referencing
to board_ops structure.

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 2016-04-01 17:28:22 +09:00 committed by Greg Kroah-Hartman
parent 77ed2c5745
commit 8670a56ff7
1 changed files with 20 additions and 17 deletions
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37
drivers/staging/dgnc/dgnc_tty.c
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@ -2518,6 +2518,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
unsigned long arg)
{
struct dgnc_board *bd;
struct board_ops *ch_bd_ops;
struct channel_t *ch;
struct un_t *un;
int rc;
@ -2539,6 +2540,8 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return -ENODEV;
ch_bd_ops = bd->bd_ops;
spin_lock_irqsave(&ch->ch_lock, flags);
if (un->un_open_count <= 0) {
@ -2563,7 +2566,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
if (rc)
return rc;
rc = ch->ch_bd->bd_ops->drain(tty, 0);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
@ -2571,7 +2574,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
spin_lock_irqsave(&ch->ch_lock, flags);
if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP))
ch->ch_bd->bd_ops->send_break(ch, 250);
ch_bd_ops->send_break(ch, 250);
spin_unlock_irqrestore(&ch->ch_lock, flags);
@ -2588,13 +2591,13 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
if (rc)
return rc;
rc = ch->ch_bd->bd_ops->drain(tty, 0);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_bd->bd_ops->send_break(ch, 250);
ch_bd_ops->send_break(ch, 250);
spin_unlock_irqrestore(&ch->ch_lock, flags);
@ -2606,13 +2609,13 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
if (rc)
return rc;
rc = ch->ch_bd->bd_ops->drain(tty, 0);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_bd->bd_ops->send_break(ch, 250);
ch_bd_ops->send_break(ch, 250);
spin_unlock_irqrestore(&ch->ch_lock, flags);
@ -2641,7 +2644,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
spin_lock_irqsave(&ch->ch_lock, flags);
tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) |
(arg ? CLOCAL : 0));
ch->ch_bd->bd_ops->param(tty);
ch_bd_ops->param(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
@ -2678,7 +2681,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) {
ch->ch_r_head = ch->ch_r_tail;
ch->ch_bd->bd_ops->flush_uart_read(ch);
ch_bd_ops->flush_uart_read(ch);
/* Force queue flow control to be released, if needed */
dgnc_check_queue_flow_control(ch);
}
@ -2686,7 +2689,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) {
if (!(un->un_type == DGNC_PRINT)) {
ch->ch_w_head = ch->ch_w_tail;
ch->ch_bd->bd_ops->flush_uart_write(ch);
ch_bd_ops->flush_uart_write(ch);
if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) {
ch->ch_tun.un_flags &=
@ -2720,14 +2723,14 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
/* flush rx */
ch->ch_flags &= ~CH_STOP;
ch->ch_r_head = ch->ch_r_tail;
ch->ch_bd->bd_ops->flush_uart_read(ch);
ch_bd_ops->flush_uart_read(ch);
/* Force queue flow control to be released, if needed */
dgnc_check_queue_flow_control(ch);
}
/* now wait for all the output to drain */
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = ch->ch_bd->bd_ops->drain(tty, 0);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
@ -2737,7 +2740,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
case TCSETAW:
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = ch->ch_bd->bd_ops->drain(tty, 0);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
@ -2760,7 +2763,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
/* set information for ditty */
if (cmd == (DIGI_SETAW)) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = ch->ch_bd->bd_ops->drain(tty, 0);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
@ -2793,7 +2796,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
else
ch->ch_flags &= ~(CH_LOOPBACK);
ch->ch_bd->bd_ops->param(tty);
ch_bd_ops->param(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
@ -2813,7 +2816,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
return rc;
spin_lock_irqsave(&ch->ch_lock, flags);
dgnc_set_custom_speed(ch, new_rate);
ch->ch_bd->bd_ops->param(tty);
ch_bd_ops->param(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
@ -2834,7 +2837,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
if (rc)
return rc;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_bd->bd_ops->send_immediate_char(ch, c);
ch_bd_ops->send_immediate_char(ch, c);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
@ -2922,7 +2925,7 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
/*
* Is the UART empty? Add that value to whats in our TX queue.
*/
count = buf.txbuf + ch->ch_bd->bd_ops->get_uart_bytes_left(ch);
count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch);
/*
* Figure out how much data the RealPort Server believes should