serial: Factor out uart_poll_timeout() from 8250 driver

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>

1 files changed, 4 insertions, 10 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 31b8cca179cd..b586406f04ca 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -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)