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Subject[PATCH 49/79] serial: move count into the tty_port version
Date
From: Alan Cox <alan@linux.intel.com>

Remove more stuff from the serial special case code

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/serial/serial_core.c | 38 ++++++++++++++++++++------------------
include/linux/serial_core.h | 1 -
2 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 0ffefb3..4af3364 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -52,7 +52,7 @@ static struct lock_class_key port_lock_key;

#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)

-#define uart_users(state) ((state)->count + (state)->port.blocked_open)
+#define uart_users(state) ((state)->port.count + (state)->port.blocked_open)

#ifdef CONFIG_SERIAL_CORE_CONSOLE
#define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line)
@@ -694,7 +694,7 @@ static int uart_set_info(struct uart_state *state,
USF_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;

/*
- * This semaphore protects state->count. It is also
+ * This semaphore protects port->count. It is also
* very useful to prevent opens. Also, take the
* port configuration semaphore to make sure that a
* module insertion/removal doesn't change anything
@@ -1272,24 +1272,24 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
if (tty_hung_up_p(filp))
goto done;

- if ((tty->count == 1) && (state->count != 1)) {
+ if ((tty->count == 1) && (port->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
- * structure will be freed. state->count should always
+ * structure will be freed. port->count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, "
- "state->count is %d\n", state->count);
- state->count = 1;
+ "port->count is %d\n", port->count);
+ port->count = 1;
}
- if (--state->count < 0) {
+ if (--port->count < 0) {
printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n",
- tty->name, state->count);
- state->count = 0;
+ tty->name, port->count);
+ port->count = 0;
}
- if (state->count)
+ if (port->count)
goto done;

/*
@@ -1421,7 +1421,7 @@ static void uart_hangup(struct tty_struct *tty)
if (state->flags & UIF_NORMAL_ACTIVE) {
uart_flush_buffer(tty);
uart_shutdown(state);
- state->count = 0;
+ port->count = 0;
state->flags &= ~UIF_NORMAL_ACTIVE;
port->tty = NULL;
wake_up_interruptible(&port->open_wait);
@@ -1478,7 +1478,7 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
unsigned int mctrl;

port->blocked_open++;
- state->count--;
+ port->count--;

add_wait_queue(&port->open_wait, &wait);
while (1) {
@@ -1539,7 +1539,7 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
set_current_state(TASK_RUNNING);
remove_wait_queue(&port->open_wait, &wait);

- state->count++;
+ port->count++;
port->blocked_open--;

if (signal_pending(current))
@@ -1562,7 +1562,7 @@ static struct uart_state *uart_get(struct uart_driver *drv, int line)
goto err;
}

- state->count++;
+ state->port.count++;
if (!state->uart_port || state->uart_port->flags & UPF_DEAD) {
ret = -ENXIO;
goto err_unlock;
@@ -1570,7 +1570,7 @@ static struct uart_state *uart_get(struct uart_driver *drv, int line)
return state;

err_unlock:
- state->count--;
+ state->port.count--;
mutex_unlock(&state->mutex);
err:
return ERR_PTR(ret);
@@ -1590,6 +1590,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
{
struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state;
struct uart_state *state;
+ struct tty_port *port;
int retval, line = tty->index;

BUG_ON(!kernel_locked());
@@ -1617,6 +1618,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
retval = PTR_ERR(state);
goto fail;
}
+ port = &state->port;

/*
* Once we set tty->driver_data here, we are guaranteed that
@@ -1627,14 +1629,14 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
state->uart_port->state = state;
tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0;
tty->alt_speed = 0;
- state->port.tty = tty;
+ port->tty = tty;

/*
* If the port is in the middle of closing, bail out now.
*/
if (tty_hung_up_p(filp)) {
retval = -EAGAIN;
- state->count--;
+ port->count--;
mutex_unlock(&state->mutex);
goto fail;
}
@@ -1642,7 +1644,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
/*
* Make sure the device is in D0 state.
*/
- if (state->count == 1)
+ if (port->count == 1)
uart_change_pm(state, 0);

/*
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index fd11d4d..63ad909 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -354,7 +354,6 @@ struct uart_state {
#define USF_CLOSING_WAIT_INF (0)
#define USF_CLOSING_WAIT_NONE (~0U)

- int count;
int pm_state;
struct circ_buf xmit;
uif_t flags;
--
1.6.4.2


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