[PATCH 17/20] riscom8: remove bogus checks

Alan Cox
2008-05-19T15:08:41Z

Chris Malley posted a patch removing a NULL check in the riscom8 driver.
Further analysis shows that even more of the tests are irrelevant so we
can delete lots of stuff
---

drivers/char/riscom8.c | 32 ++++++++------------------------
1 files changed, 8 insertions(+), 24 deletions(-)

diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c
index b0ba241..3ca8957 100644
--- a/drivers/char/riscom8.c
+++ b/drivers/char/riscom8.c
@@ -638,9 +638,6 @@ static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
unsigned char cor1 = 0, cor3 = 0;
unsigned char mcor1 = 0, mcor2 = 0;

- if (tty == NULL || tty->termios == NULL)
- return;
-
port->IER = 0;
port->COR2 = 0;
port->MSVR = MSVR_RTS;
@@ -794,8 +791,7 @@ static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)

spin_lock_irqsave(&riscom_lock, flags);

- if (port->port.tty)
- clear_bit(TTY_IO_ERROR, &port->port.tty->flags);
+ clear_bit(TTY_IO_ERROR, &port->port.tty->flags);
if (port->port.count == 1)
bp->count++;
port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
@@ -807,10 +803,9 @@ static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
}

/* Must be called with interrupts disabled */
-static void rc_shutdown_port(struct riscom_board *bp, struct riscom_port *port)
+static void rc_shutdown_port(struct tty_struct *tty,
+ struct riscom_board *bp, struct riscom_port *port)
{
- struct tty_struct *tty;
-
if (!(port->port.flags & ASYNC_INITIALIZED))
return;

@@ -830,10 +825,7 @@ static void rc_shutdown_port(struct riscom_board *bp, struct riscom_port *port)
}
#endif
tty_port_free_xmit_buf(&port->port);
-
- tty = port->port.tty;
-
- if (tty == NULL || C_HUPCL(tty)) {
+ if (C_HUPCL(tty)) {
/* Drop DTR */
bp->DTR |= (1u << port_No(port));
rc_out(bp, RC_DTR, bp->DTR);
@@ -848,8 +840,7 @@ static void rc_shutdown_port(struct riscom_board *bp, struct riscom_port *port)
port->IER = 0;
rc_out(bp, CD180_IER, port->IER);

- if (tty)
- set_bit(TTY_IO_ERROR, &tty->flags);
+ set_bit(TTY_IO_ERROR, &tty->flags);
port->port.flags &= ~ASYNC_INITIALIZED;

if (--bp->count < 0) {
@@ -1067,7 +1058,7 @@ static void rc_close(struct tty_struct *tty, struct file *filp)
break;
}
}
- rc_shutdown_port(bp, port);
+ rc_shutdown_port(tty, bp, port);
rc_flush_buffer(tty);
tty_ldisc_flush(tty);

@@ -1098,9 +1089,6 @@ static int rc_write(struct tty_struct *tty,

bp = port_Board(port);

- if (!tty || !port->port.xmit_buf)
- return 0;
-
while (1) {
spin_lock_irqsave(&riscom_lock, flags);

@@ -1141,9 +1129,6 @@ static int rc_put_char(struct tty_struct *tty, unsigned char ch)
if (rc_paranoia_check(port, tty->name, "rc_put_char"))
return 0;

- if (!tty || !port->port.xmit_buf)
- return 0;
-
spin_lock_irqsave(&riscom_lock, flags);

if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
@@ -1167,8 +1152,7 @@ static void rc_flush_chars(struct tty_struct *tty)
if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
return;

- if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
- !port->port.xmit_buf)
+ if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped)
return;

spin_lock_irqsave(&riscom_lock, flags);
@@ -1488,7 +1472,7 @@ static void rc_hangup(struct tty_struct *tty)

bp = port_Board(port);

- rc_shutdown_port(bp, port);
+ rc_shutdown_port(tty, bp, port);
port->port.count = 0;
port->port.flags &= ~ASYNC_NORMAL_ACTIVE;
port->port.tty = NULL;