uml: mconsole mutex conversion

The plug_mem_mutex 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>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 949037e92a7..9820fdbb9c7 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -17,6 +17,7 @@
 #include "linux/syscalls.h"
 #include "linux/utsname.h"
 #include "linux/workqueue.h"
+#include "linux/mutex.h"
 #include "asm/uaccess.h"
 #include "init.h"
 #include "irq_kern.h"
@@ -360,7 +361,7 @@ struct unplugged_pages {
         void *pages[UNPLUGGED_PER_PAGE];
 };
 
-static DECLARE_MUTEX(plug_mem_mutex);
+static DEFINE_MUTEX(plug_mem_mutex);
 static unsigned long long unplugged_pages_count = 0;
 static LIST_HEAD(unplugged_pages);
 static int unplug_index = UNPLUGGED_PER_PAGE;
@@ -396,7 +397,7 @@ static int mem_config(char *str, char **error_out)
 
         diff /= PAGE_SIZE;
 
-        down(&plug_mem_mutex);
+        mutex_lock(&plug_mem_mutex);
         for (i = 0; i < diff; i++) {
                 struct unplugged_pages *unplugged;
                 void *addr;
@@ -453,7 +454,7 @@ static int mem_config(char *str, char **error_out)
 
         err = 0;
 out_unlock:
-        up(&plug_mem_mutex);
+        mutex_unlock(&plug_mem_mutex);
 out:
         return err;
 }