Commit c1314a49 authored by Alan Cox's avatar Alan Cox Committed by Linus Torvalds
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tty: Redo the rocket driver locking 



Bring this driver into the port locking model

Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6ed1dbae

drivers/char/epca.c

+2 −7
Original line number Diff line number Diff line
@@ -164,8 +164,6 @@ static int pc_write_room(struct tty_struct *); 
static int pc_chars_in_buffer(struct tty_struct *);

static void pc_flush_buffer(struct tty_struct *);

static void pc_flush_chars(struct tty_struct *);

static int block_til_ready(struct tty_struct *, struct file *,

			struct channel *);

static int pc_open(struct tty_struct *, struct file *);

static void post_fep_init(unsigned int crd);

static void epcapoll(unsigned long);
@@ -422,7 +420,6 @@ static void pc_close(struct tty_struct *tty, struct file *filp) 
{

	struct channel *ch;

	struct tty_port *port;

	unsigned long flags;

	/*

	 * verifyChannel returns the channel from the tty struct if it is

	 * valid. This serves as a sanity check.
@@ -491,8 +488,6 @@ static void pc_hangup(struct tty_struct *tty) 
	 */

	ch = verifyChannel(tty);

	if (ch != NULL) {

		unsigned long flags;



		pc_flush_buffer(tty);

		tty_ldisc_flush(tty);

		shutdown(ch, tty);
@@ -750,7 +745,7 @@ static int epca_carrier_raised(struct tty_port *port) 
	return 0;

}



static void epca_raise_dtr_rts(struct tty_port *port0

static void epca_raise_dtr_rts(struct tty_port *port)

{

}
@@ -1268,7 +1263,7 @@ static void post_fep_init(unsigned int crd) 
		u16 tseg, rseg;



		tty_port_init(&ch->port);

		ch->port.ops - &epca_port_ops;

		ch->port.ops = &epca_port_ops;

		ch->brdchan = bc;

		ch->mailbox = gd;

		INIT_WORK(&ch->tqueue, do_softint);

drivers/char/rocket.c

+18 −17
Original line number Diff line number Diff line
@@ -920,7 +920,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp, 
#ifdef ROCKET_DEBUG_OPEN

	printk(KERN_INFO "block_til_ready before block: ttyR%d, count = %d\n", info->line, port->count);

#endif

	spin_lock_irqsave(&info->slock, flags);

	spin_lock_irqsave(&port->lock, flags);



#ifdef ROCKET_DISABLE_SIMUSAGE

	info->flags |= ASYNC_NORMAL_ACTIVE;
@@ -932,7 +932,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp, 
#endif

	port->blocked_open++;



	spin_unlock_irqrestore(&info->slock, flags);

	spin_unlock_irqrestore(&port->lock, flags);



	while (1) {

		if (tty->termios->c_cflag & CBAUD)
@@ -961,13 +961,13 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp, 
	__set_current_state(TASK_RUNNING);

	remove_wait_queue(&port->open_wait, &wait);



	spin_lock_irqsave(&info->slock, flags);

	spin_lock_irqsave(&port->lock, flags);



	if (extra_count)

		port->count++;

	port->blocked_open--;



	spin_unlock_irqrestore(&info->slock, flags);

	spin_unlock_irqrestore(&port->lock, flags);



#ifdef ROCKET_DEBUG_OPEN

	printk(KERN_INFO "block_til_ready after blocking: ttyR%d, count = %d\n",
@@ -1095,6 +1095,7 @@ static int rp_open(struct tty_struct *tty, struct file *filp) 
static void rp_close(struct tty_struct *tty, struct file *filp)

{

	struct r_port *info = tty->driver_data;

	struct tty_port *port = &info->port;

	unsigned long flags;

	int timeout;

	CHANNEL_t *cp;
@@ -1108,9 +1109,9 @@ static void rp_close(struct tty_struct *tty, struct file *filp) 


	if (tty_hung_up_p(filp))

		return;

	spin_lock_irqsave(&info->slock, flags);

	spin_lock_irqsave(&port->lock, flags);



	if ((tty->count == 1) && (info->port.count != 1)) {

	if (tty->count == 1 && port->count != 1) {

		/*

		 * Uh, oh.  tty->count is 1, which means that the tty

		 * structure will be freed.  Info->count should always
@@ -1120,19 +1121,19 @@ static void rp_close(struct tty_struct *tty, struct file *filp) 
		 */

		printk(KERN_WARNING "rp_close: bad serial port count; "

			"tty->count is 1, info->port.count is %d\n", info->port.count);

		info->port.count = 1;

		port->count = 1;

	}

	if (--info->port.count < 0) {

	if (--port->count < 0) {

		printk(KERN_WARNING "rp_close: bad serial port count for "

				"ttyR%d: %d\n", info->line, info->port.count);

		info->port.count = 0;

		port->count = 0;

	}

	if (info->port.count) {

		spin_unlock_irqrestore(&info->slock, flags);

	if (port->count) {

		spin_unlock_irqrestore(&port->lock, flags);

		return;

	}

	info->flags |= ASYNC_CLOSING;

	spin_unlock_irqrestore(&info->slock, flags);

	spin_unlock_irqrestore(&port->lock, flags);



	cp = &info->channel;
@@ -1152,7 +1153,7 @@ static void rp_close(struct tty_struct *tty, struct file *filp) 
	 * Wait for the transmit buffer to clear

	 */

	if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)

		tty_wait_until_sent(tty, info->port.closing_wait);

		tty_wait_until_sent(tty, port->closing_wait);

	/*

	 * Before we drop DTR, make sure the UART transmitter

	 * has completely drained; this is especially
@@ -1181,11 +1182,11 @@ static void rp_close(struct tty_struct *tty, struct file *filp) 


	clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);



	if (info->port.blocked_open) {

		if (info->port.close_delay) {

			msleep_interruptible(jiffies_to_msecs(info->port.close_delay));

	if (port->blocked_open) {

		if (port->close_delay) {

			msleep_interruptible(jiffies_to_msecs(port->close_delay));

		}

		wake_up_interruptible(&info->port.open_wait);

		wake_up_interruptible(&port->open_wait);

	} else {

		if (info->xmit_buf) {

			free_page((unsigned long) info->xmit_buf);