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Commit 2e124b4a authored by Jiri Slaby's avatar Jiri Slaby Committed by Greg Kroah-Hartman
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TTY: switch tty_flip_buffer_push 



Now, we start converting tty buffer functions to actually use
tty_port. This will allow us to get rid of the need of tty in many
call sites. Only tty_port will needed and hence no more
tty_port_tty_get in those paths.

Now, the one where most of tty_port_tty_get gets removed:
tty_flip_buffer_push.

IOW we also closed all the races in drivers not using tty_port_tty_get
at all yet.

Also we move tty_flip_buffer_push declaration from include/linux/tty.h
to include/linux/tty_flip.h to all others while we are changing it
anyway.

Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d6c53c0e

arch/ia64/hp/sim/simserial.c

+4 −14
Original line number Diff line number Diff line
@@ -53,9 +53,8 @@ struct tty_driver *hp_simserial_driver; 


static struct console *console;



static void receive_chars(struct tty_struct *tty)

static void receive_chars(struct tty_port *port)

{

	struct tty_port *port = tty->port;

	unsigned char ch;

	static unsigned char seen_esc = 0;
@@ -85,7 +84,7 @@ static void receive_chars(struct tty_struct *tty) 
		if (tty_insert_flip_char(port, ch, TTY_NORMAL) == 0)

			break;

	}

	tty_flip_buffer_push(tty);

	tty_flip_buffer_push(port);

}



/*
@@ -94,18 +93,9 @@ static void receive_chars(struct tty_struct *tty) 
static irqreturn_t rs_interrupt_single(int irq, void *dev_id)

{

	struct serial_state *info = dev_id;

	struct tty_struct *tty = tty_port_tty_get(&info->port);



	if (!tty) {

		printk(KERN_INFO "%s: tty=0 problem\n", __func__);

		return IRQ_NONE;

	}

	/*

	 * pretty simple in our case, because we only get interrupts

	 * on inbound traffic

	 */

	receive_chars(tty);

	tty_kref_put(tty);

	receive_chars(&info->port);



	return IRQ_HANDLED;

}

arch/mn10300/kernel/mn10300-serial.c

+3 −4
Original line number Diff line number Diff line
@@ -525,7 +525,6 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port) 
{

	struct uart_icount *icount = &port->uart.icount;

	struct tty_port *port = &port->uart.state->port;

	struct tty_struct *tty = port->tty;

	unsigned ix;

	int count;

	u8 st, ch, push, status, overrun;
@@ -538,7 +537,7 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port) 
	count = tty_buffer_request_room(port, count);

	if (count == 0) {

		if (!port->low_latency)

			tty_flip_buffer_push(tty);

			tty_flip_buffer_push(port);

		return;

	}
@@ -547,7 +546,7 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port) 
	ix = ACCESS_ONCE(port->rx_outp);

	if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) {

		if (push && !port->low_latency)

			tty_flip_buffer_push(tty);

			tty_flip_buffer_push(port);

		return;

	}
@@ -679,7 +678,7 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port) 
	count--;

	if (count <= 0) {

		if (!port->low_latency)

			tty_flip_buffer_push(tty);

			tty_flip_buffer_push(port);

		return;

	}

arch/parisc/kernel/pdc_cons.c

+1 −7
Original line number Diff line number Diff line
@@ -138,10 +138,6 @@ static const struct tty_operations pdc_console_tty_ops = { 
static void pdc_console_poll(unsigned long unused)

{

	int data, count = 0;

	struct tty_struct *tty = tty_port_tty_get(&tty_port);



	if (!tty)

		return;



	while (1) {

		data = pdc_console_poll_key(NULL);
@@ -152,9 +148,7 @@ static void pdc_console_poll(unsigned long unused) 
	}



	if (count)

		tty_flip_buffer_push(tty);



	tty_kref_put(tty);

		tty_flip_buffer_push(&tty_port);



	if (pdc_cons.flags & CON_ENABLED)

		mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);

arch/um/drivers/chan.h

+1 −2
Original line number Diff line number Diff line
@@ -27,8 +27,7 @@ struct chan { 
	void *data;

};



extern void chan_interrupt(struct line *line,

			   struct tty_struct *tty, int irq);

extern void chan_interrupt(struct line *line, int irq);

extern int parse_chan_pair(char *str, struct line *line, int device,

			   const struct chan_opts *opts, char **error_out);

extern int write_chan(struct chan *chan, const char *buf, int len,

arch/um/drivers/chan_kern.c

+7 −7
Original line number Diff line number Diff line
@@ -131,11 +131,9 @@ void chan_enable_winch(struct chan *chan, struct tty_struct *tty) 
static void line_timer_cb(struct work_struct *work)

{

	struct line *line = container_of(work, struct line, task.work);

	struct tty_struct *tty = tty_port_tty_get(&line->port);



	if (!line->throttled)

		chan_interrupt(line, tty, line->driver->read_irq);

	tty_kref_put(tty);

		chan_interrupt(line, line->driver->read_irq);

}



int enable_chan(struct line *line)
@@ -546,7 +544,7 @@ int parse_chan_pair(char *str, struct line *line, int device, 
	return 0;

}



void chan_interrupt(struct line *line, struct tty_struct *tty, int irq)

void chan_interrupt(struct line *line, int irq)

{

	struct tty_port *port = &line->port;

	struct chan *chan = line->chan_in;
@@ -570,8 +568,11 @@ void chan_interrupt(struct line *line, struct tty_struct *tty, int irq) 
		reactivate_fd(chan->fd, irq);

	if (err == -EIO) {

		if (chan->primary) {

			if (tty != NULL)

			struct tty_struct *tty = tty_port_tty_get(&line->port);

			if (tty != NULL) {

				tty_hangup(tty);

				tty_kref_put(tty);

			}

			if (line->chan_out != chan)

				close_one_chan(line->chan_out, 1);

		}
@@ -580,6 +581,5 @@ void chan_interrupt(struct line *line, struct tty_struct *tty, int irq) 
			return;

	}

 out:

	if (tty)

		tty_flip_buffer_push(tty);

	tty_flip_buffer_push(port);

}