uml: port mutex conversion

The port_sem is already used as a mutex since it's using DECLARE_MUTEX(), but
the underlying construct is still a semaphore ..  This patch switches it over
to a struct mutex.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/um/drivers/port_kern.c b/arch/um/drivers/port_kern.c
index 330543b3129b5a7ac613e3566456eaf3ef50040c..19930081d3d8e93c42c7c0cf3d8be783ede5c304 100644 (file)
--- a/arch/um/drivers/port_kern.c
+++ b/arch/um/drivers/port_kern.c
@@ -6,6 +6,7 @@
 #include "linux/completion.h"
 #include "linux/interrupt.h"
 #include "linux/list.h"
+#include "linux/mutex.h"
 #include "asm/atomic.h"
 #include "init.h"
 #include "irq_kern.h"
@@ -120,7 +121,7 @@ static int port_accept(struct port_list *port)
        return 0;
 }
 
-static DECLARE_MUTEX(ports_sem);
+static DEFINE_MUTEX(ports_mutex);
 static LIST_HEAD(ports);
 
 static void port_work_proc(struct work_struct *unused)
@@ -161,7 +162,7 @@ void *port_data(int port_num)
        struct port_dev *dev = NULL;
        int fd;
 
-       down(&ports_sem);
+       mutex_lock(&ports_mutex);
        list_for_each(ele, &ports) {
                port = list_entry(ele, struct port_list, list);
                if (port->port == port_num)
@@ -216,7 +217,7 @@ void *port_data(int port_num)
  out_free:
        kfree(port);
  out:
-       up(&ports_sem);
+       mutex_unlock(&ports_mutex);
        return dev;
 }