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serial: Factor out uart_poll_timeout() from 8250 driver

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Soon we will use that handy function in the altera_uart driver.

Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Anton Vorontsov 2010-10-01 17:21:25 +04:00 committed by Greg Kroah-Hartman
parent 8ee16a1b89
commit 54381067ed
2 changed files with 12 additions and 10 deletions
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14
drivers/serial/8250.c
View File

@ -1722,12 +1722,6 @@ static void serial_unlink_irq_chain(struct uart_8250_port *up)
mutex_unlock(&hash_mutex);
}
/* Base timer interval for polling */
static inline int poll_timeout(int timeout)
{
return timeout > 6 ? (timeout / 2 - 2) : 1;
}
/*
* This function is used to handle ports that do not have an
* interrupt. This doesn't work very well for 16450's, but gives
@ -1742,7 +1736,7 @@ static void serial8250_timeout(unsigned long data)
iir = serial_in(up, UART_IIR);
if (!(iir & UART_IIR_NO_INT))
serial8250_handle_port(up);
mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout));
mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
}
static void serial8250_backup_timeout(unsigned long data)
@ -1787,7 +1781,7 @@ static void serial8250_backup_timeout(unsigned long data)
/* Standard timer interval plus 0.2s to keep the port running */
mod_timer(&up->timer,
jiffies + poll_timeout(up->port.timeout) + HZ / 5);
jiffies + uart_poll_timeout(&up->port) + HZ / 5);
}
static unsigned int serial8250_tx_empty(struct uart_port *port)
@ -2071,7 +2065,7 @@ static int serial8250_startup(struct uart_port *port)
up->timer.function = serial8250_backup_timeout;
up->timer.data = (unsigned long)up;
mod_timer(&up->timer, jiffies +
poll_timeout(up->port.timeout) + HZ / 5);
uart_poll_timeout(port) + HZ / 5);
}
/*
@ -2081,7 +2075,7 @@ static int serial8250_startup(struct uart_port *port)
*/
if (!is_real_interrupt(up->port.irq)) {
up->timer.data = (unsigned long)up;
mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout));
mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
} else {
retval = serial_link_irq_chain(up);
if (retval)

8
include/linux/serial_core.h
View File

@ -411,6 +411,14 @@ unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios
unsigned int max);
unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
/* Base timer interval for polling */
static inline int uart_poll_timeout(struct uart_port *port)
{
int timeout = port->timeout;
return timeout > 6 ? (timeout / 2 - 2) : 1;
}
/*
* Console helpers.
*/