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Subject[PATCH 33/79] tty: riscom8 kref and tty_port_close
Date
From: Alan Cox <alan@linux.intel.com>

We need to kref this driver in order to use port_close

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/char/riscom8.c | 131 +++++++++++++++++++++--------------------------
1 files changed, 59 insertions(+), 72 deletions(-)

diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c
index 9499991..7b5623b 100644
--- a/drivers/char/riscom8.c
+++ b/drivers/char/riscom8.c
@@ -343,7 +343,7 @@ static void rc_receive_exc(struct riscom_board const *bp)
if (port == NULL)
return;

- tty = port->port.tty;
+ tty = tty_port_tty_get(&port->port);

#ifdef RC_REPORT_OVERRUN
status = rc_in(bp, CD180_RCSR);
@@ -355,18 +355,18 @@ static void rc_receive_exc(struct riscom_board const *bp)
#endif
ch = rc_in(bp, CD180_RDR);
if (!status)
- return;
+ goto out;
if (status & RCSR_TOUT) {
printk(KERN_WARNING "rc%d: port %d: Receiver timeout. "
"Hardware problems ?\n",
board_No(bp), port_No(port));
- return;
+ goto out;

} else if (status & RCSR_BREAK) {
printk(KERN_INFO "rc%d: port %d: Handling break...\n",
board_No(bp), port_No(port));
flag = TTY_BREAK;
- if (port->port.flags & ASYNC_SAK)
+ if (tty && (port->port.flags & ASYNC_SAK))
do_SAK(tty);

} else if (status & RCSR_PE)
@@ -380,8 +380,12 @@ static void rc_receive_exc(struct riscom_board const *bp)
else
flag = TTY_NORMAL;

- tty_insert_flip_char(tty, ch, flag);
- tty_flip_buffer_push(tty);
+ if (tty) {
+ tty_insert_flip_char(tty, ch, flag);
+ tty_flip_buffer_push(tty);
+ }
+out:
+ tty_kref_put(tty);
}

static void rc_receive(struct riscom_board const *bp)
@@ -394,7 +398,7 @@ static void rc_receive(struct riscom_board const *bp)
if (port == NULL)
return;

- tty = port->port.tty;
+ tty = tty_port_tty_get(&port->port);

count = rc_in(bp, CD180_RDCR);

@@ -403,15 +407,14 @@ static void rc_receive(struct riscom_board const *bp)
#endif

while (count--) {
- if (tty_buffer_request_room(tty, 1) == 0) {
- printk(KERN_WARNING "rc%d: port %d: Working around "
- "flip buffer overflow.\n",
- board_No(bp), port_No(port));
- break;
- }
- tty_insert_flip_char(tty, rc_in(bp, CD180_RDR), TTY_NORMAL);
+ u8 ch = rc_in(bp, CD180_RDR);
+ if (tty)
+ tty_insert_flip_char(tty, ch, TTY_NORMAL);
+ }
+ if (tty) {
+ tty_flip_buffer_push(tty);
+ tty_kref_put(tty);
}
- tty_flip_buffer_push(tty);
}

static void rc_transmit(struct riscom_board const *bp)
@@ -424,22 +427,22 @@ static void rc_transmit(struct riscom_board const *bp)
if (port == NULL)
return;

- tty = port->port.tty;
+ tty = tty_port_tty_get(&port->port);

if (port->IER & IER_TXEMPTY) {
/* FIFO drained */
rc_out(bp, CD180_CAR, port_No(port));
port->IER &= ~IER_TXEMPTY;
rc_out(bp, CD180_IER, port->IER);
- return;
+ goto out;
}

if ((port->xmit_cnt <= 0 && !port->break_length)
- || tty->stopped || tty->hw_stopped) {
+ || (tty && (tty->stopped || tty->hw_stopped))) {
rc_out(bp, CD180_CAR, port_No(port));
port->IER &= ~IER_TXRDY;
rc_out(bp, CD180_IER, port->IER);
- return;
+ goto out;
}

if (port->break_length) {
@@ -480,8 +483,10 @@ static void rc_transmit(struct riscom_board const *bp)
port->IER &= ~IER_TXRDY;
rc_out(bp, CD180_IER, port->IER);
}
- if (port->xmit_cnt <= port->wakeup_chars)
+ if (tty && port->xmit_cnt <= port->wakeup_chars)
tty_wakeup(tty);
+out:
+ tty_kref_put(tty);
}

static void rc_check_modem(struct riscom_board const *bp)
@@ -494,37 +499,43 @@ static void rc_check_modem(struct riscom_board const *bp)
if (port == NULL)
return;

- tty = port->port.tty;
+ tty = tty_port_tty_get(&port->port);

mcr = rc_in(bp, CD180_MCR);
if (mcr & MCR_CDCHG) {
if (rc_in(bp, CD180_MSVR) & MSVR_CD)
wake_up_interruptible(&port->port.open_wait);
- else
+ else if (tty)
tty_hangup(tty);
}

#ifdef RISCOM_BRAIN_DAMAGED_CTS
if (mcr & MCR_CTSCHG) {
if (rc_in(bp, CD180_MSVR) & MSVR_CTS) {
- tty->hw_stopped = 0;
port->IER |= IER_TXRDY;
- if (port->xmit_cnt <= port->wakeup_chars)
- tty_wakeup(tty);
+ if (tty) {
+ tty->hw_stopped = 0;
+ if (port->xmit_cnt <= port->wakeup_chars)
+ tty_wakeup(tty);
+ }
} else {
- tty->hw_stopped = 1;
+ if (tty)
+ tty->hw_stopped = 1;
port->IER &= ~IER_TXRDY;
}
rc_out(bp, CD180_IER, port->IER);
}
if (mcr & MCR_DSRCHG) {
if (rc_in(bp, CD180_MSVR) & MSVR_DSR) {
- tty->hw_stopped = 0;
port->IER |= IER_TXRDY;
- if (port->xmit_cnt <= port->wakeup_chars)
- tty_wakeup(tty);
+ if (tty) {
+ tty->hw_stopped = 0;
+ if (port->xmit_cnt <= port->wakeup_chars)
+ tty_wakeup(tty);
+ }
} else {
- tty->hw_stopped = 1;
+ if (tty)
+ tty->hw_stopped = 1;
port->IER &= ~IER_TXRDY;
}
rc_out(bp, CD180_IER, port->IER);
@@ -533,6 +544,7 @@ static void rc_check_modem(struct riscom_board const *bp)

/* Clear change bits */
rc_out(bp, CD180_MCR, 0);
+ tty_kref_put(tty);
}

/* The main interrupt processing routine */
@@ -632,9 +644,9 @@ static void rc_shutdown_board(struct riscom_board *bp)
* Setting up port characteristics.
* Must be called with disabled interrupts
*/
-static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
+static void rc_change_speed(struct tty_struct *tty, struct riscom_board *bp,
+ struct riscom_port *port)
{
- struct tty_struct *tty = port->port.tty;
unsigned long baud;
long tmp;
unsigned char cor1 = 0, cor3 = 0;
@@ -781,7 +793,8 @@ static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
}

/* Must be called with interrupts enabled */
-static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
+static int rc_setup_port(struct tty_struct *tty, struct riscom_board *bp,
+ struct riscom_port *port)
{
unsigned long flags;

@@ -793,11 +806,11 @@ static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)

spin_lock_irqsave(&riscom_lock, flags);

- clear_bit(TTY_IO_ERROR, &port->port.tty->flags);
+ clear_bit(TTY_IO_ERROR, &tty->flags);
if (port->port.count == 1)
bp->count++;
port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
- rc_change_speed(bp, port);
+ rc_change_speed(tty, bp, port);
port->port.flags |= ASYNC_INITIALIZED;

spin_unlock_irqrestore(&riscom_lock, flags);
@@ -898,9 +911,9 @@ static int rc_open(struct tty_struct *tty, struct file *filp)

port->port.count++;
tty->driver_data = port;
- port->port.tty = tty;
+ tty_port_tty_set(&port->port, tty);

- error = rc_setup_port(bp, port);
+ error = rc_setup_port(tty, bp, port);
if (error == 0)
error = tty_port_block_til_ready(&port->port, tty, filp);
return error;
@@ -921,7 +934,7 @@ static void rc_flush_buffer(struct tty_struct *tty)
tty_wakeup(tty);
}

-static void rc_close_port(struct tty_struct *tty, struct tty_port *port)
+static void rc_close_port(struct tty_port *port, struct tty_struct *tty)
{
unsigned long flags;
struct riscom_port *rp = container_of(port, struct riscom_port, port);
@@ -966,14 +979,7 @@ static void rc_close(struct tty_struct *tty, struct file *filp)

if (!port || rc_paranoia_check(port, tty->name, "close"))
return;
-
- if (tty_port_close_start(&port->port, tty, filp) == 0)
- return;
-
- rc_close_port(tty, &port->port);
- rc_flush_buffer(tty);
-
- tty_port_close_end(&port->port, tty);
+ tty_port_close(&port->port, tty, filp);
}

static int rc_write(struct tty_struct *tty,
@@ -1175,7 +1181,7 @@ static int rc_send_break(struct tty_struct *tty, int length)
return 0;
}

-static int rc_set_serial_info(struct riscom_port *port,
+static int rc_set_serial_info(struct tty_struct *tty, struct riscom_port *port,
struct serial_struct __user *newinfo)
{
struct serial_struct tmp;
@@ -1185,17 +1191,6 @@ static int rc_set_serial_info(struct riscom_port *port,
if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
return -EFAULT;

-#if 0
- if ((tmp.irq != bp->irq) ||
- (tmp.port != bp->base) ||
- (tmp.type != PORT_CIRRUS) ||
- (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
- (tmp.custom_divisor != 0) ||
- (tmp.xmit_fifo_size != CD180_NFIFO) ||
- (tmp.flags & ~RISCOM_LEGAL_FLAGS))
- return -EINVAL;
-#endif
-
change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
(tmp.flags & ASYNC_SPD_MASK));

@@ -1217,7 +1212,7 @@ static int rc_set_serial_info(struct riscom_port *port,
unsigned long flags;

spin_lock_irqsave(&riscom_lock, flags);
- rc_change_speed(bp, port);
+ rc_change_speed(tty, bp, port);
spin_unlock_irqrestore(&riscom_lock, flags);
}
return 0;
@@ -1260,7 +1255,7 @@ static int rc_ioctl(struct tty_struct *tty, struct file *filp,
break;
case TIOCSSERIAL:
lock_kernel();
- retval = rc_set_serial_info(port, argp);
+ retval = rc_set_serial_info(tty, port, argp);
unlock_kernel();
break;
default:
@@ -1355,21 +1350,12 @@ static void rc_start(struct tty_struct *tty)
static void rc_hangup(struct tty_struct *tty)
{
struct riscom_port *port = tty->driver_data;
- struct riscom_board *bp;
- unsigned long flags;

if (rc_paranoia_check(port, tty->name, "rc_hangup"))
return;

- bp = port_Board(port);
-
- rc_shutdown_port(tty, bp, port);
- spin_lock_irqsave(&port->port.lock, flags);
- port->port.count = 0;
- port->port.flags &= ~ASYNC_NORMAL_ACTIVE;
- port->port.tty = NULL;
- wake_up_interruptible(&port->port.open_wait);
- spin_unlock_irqrestore(&port->port.lock, flags);
+ rc_shutdown_port(tty, port_Board(port), port);
+ tty_port_hangup(&port->port);
}

static void rc_set_termios(struct tty_struct *tty,
@@ -1382,7 +1368,7 @@ static void rc_set_termios(struct tty_struct *tty,
return;

spin_lock_irqsave(&riscom_lock, flags);
- rc_change_speed(port_Board(port), port);
+ rc_change_speed(tty, port_Board(port), port);
spin_unlock_irqrestore(&riscom_lock, flags);

if ((old_termios->c_cflag & CRTSCTS) &&
@@ -1415,6 +1401,7 @@ static const struct tty_operations riscom_ops = {

static const struct tty_port_operations riscom_port_ops = {
.carrier_raised = carrier_raised,
+ .shutdown = rc_close_port,
};


--
1.6.4.2


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