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: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index 942022a..da2f319 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -53,9 +53,8 @@
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 @@
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 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;
}
diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c
index ae61bd6..1dd20db 100644
--- a/arch/mn10300/kernel/mn10300-serial.c
+++ b/arch/mn10300/kernel/mn10300-serial.c
@@ -525,7 +525,6 @@
{
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 @@
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 @@
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 @@
count--;
if (count <= 0) {
if (!port->low_latency)
- tty_flip_buffer_push(tty);
+ tty_flip_buffer_push(port);
return;
}
diff --git a/arch/parisc/kernel/pdc_cons.c b/arch/parisc/kernel/pdc_cons.c
index 4d92a37..d5cae55 100644
--- a/arch/parisc/kernel/pdc_cons.c
+++ b/arch/parisc/kernel/pdc_cons.c
@@ -138,10 +138,6 @@
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 @@
}
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);
diff --git a/arch/um/drivers/chan.h b/arch/um/drivers/chan.h
index 02b5a76..78f1b89 100644
--- a/arch/um/drivers/chan.h
+++ b/arch/um/drivers/chan.h
@@ -27,8 +27,7 @@
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,
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 795bd81..15c553c 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -131,11 +131,9 @@
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 @@
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 @@
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 @@
return;
}
out:
- if (tty)
- tty_flip_buffer_push(tty);
+ tty_flip_buffer_push(port);
}
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 9ffc28b..f1b3857 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -19,11 +19,10 @@
{
struct chan *chan = data;
struct line *line = chan->line;
- struct tty_struct *tty = tty_port_tty_get(&line->port);
if (line)
- chan_interrupt(line, tty, irq);
- tty_kref_put(tty);
+ chan_interrupt(line, irq);
+
return IRQ_HANDLED;
}
@@ -234,7 +233,7 @@
struct line *line = tty->driver_data;
line->throttled = 0;
- chan_interrupt(line, tty, line->driver->read_irq);
+ chan_interrupt(line, line->driver->read_irq);
/*
* Maybe there is enough stuff pending that calling the interrupt
diff --git a/arch/xtensa/platforms/iss/console.c b/arch/xtensa/platforms/iss/console.c
index 62447d6..da9866f 100644
--- a/arch/xtensa/platforms/iss/console.c
+++ b/arch/xtensa/platforms/iss/console.c
@@ -58,7 +58,8 @@
tty->port = &serial_port;
spin_lock(&timer_lock);
if (tty->count == 1) {
- setup_timer(&serial_timer, rs_poll, (unsigned long)tty);
+ setup_timer(&serial_timer, rs_poll,
+ (unsigned long)&serial_port);
mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
}
spin_unlock(&timer_lock);
@@ -97,9 +98,7 @@
static void rs_poll(unsigned long priv)
{
- struct tty_struct* tty = (struct tty_struct*) priv;
- struct tty_port *port = tty->port;
-
+ struct tty_port *port = (struct tty_port *)priv;
struct timeval tv = { .tv_sec = 0, .tv_usec = 0 };
int i = 0;
unsigned char c;
@@ -113,7 +112,7 @@
}
if (i)
- tty_flip_buffer_push(tty);
+ tty_flip_buffer_push(port);
mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);