[SERIAL] turn serial semaphores into mutexes

Turn several drivers/serial/ semaphores-used-as-mutex into mutexes

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 54e5cc0dd5f8..fb610c3634a4 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -41,6 +41,7 @@
 #include <linux/serial.h>
 #include <linux/serial_8250.h>
 #include <linux/nmi.h>
+#include <linux/mutex.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -2467,7 +2468,7 @@ static struct platform_device *serial8250_isa_devs;
  * 16x50 serial ports to be configured at run-time, to support PCMCIA
  * modems and PCI multiport cards.
  */
-static DECLARE_MUTEX(serial_sem);
+static DEFINE_MUTEX(serial_mutex);
 
 static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port)
 {
@@ -2522,7 +2523,7 @@ int serial8250_register_port(struct uart_port *port)
         if (port->uartclk == 0)
                 return -EINVAL;
 
-        down(&serial_sem);
+        mutex_lock(&serial_mutex);
 
         uart = serial8250_find_match_or_unused(port);
         if (uart) {
@@ -2544,7 +2545,7 @@ int serial8250_register_port(struct uart_port *port)
                 if (ret == 0)
                         ret = uart->port.line;
         }
-        up(&serial_sem);
+        mutex_unlock(&serial_mutex);
 
         return ret;
 }
@@ -2561,7 +2562,7 @@ void serial8250_unregister_port(int line)
 {
         struct uart_8250_port *uart = &serial8250_ports[line];
 
-        down(&serial_sem);
+        mutex_lock(&serial_mutex);
         uart_remove_one_port(&serial8250_reg, &uart->port);
         if (serial8250_isa_devs) {
                 uart->port.flags &= ~UPF_BOOT_AUTOCONF;
@@ -2571,7 +2572,7 @@ void serial8250_unregister_port(int line)
         } else {
                 uart->port.dev = NULL;
         }
-        up(&serial_sem);
+        mutex_unlock(&serial_mutex);
 }
 EXPORT_SYMBOL(serial8250_unregister_port);