isapnp driver semaphore to mutex

Changed the isapnp semaphore to a mutex.

[akpm@linux-foundation.org: no externs-in-c]
[akpm@linux-foundation.org: build fix]
Signed-off-by: Daniel Walker <dwalker@mvista.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/pnp/interface.c b/drivers/pnp/interface.c
index 31548044fdde..982658477a58 100644
--- a/drivers/pnp/interface.c
+++ b/drivers/pnp/interface.c
@@ -10,9 +10,12 @@
 #include <linux/errno.h>
 #include <linux/list.h>
 #include <linux/types.h>
+#include <linux/pnp.h>
 #include <linux/stat.h>
 #include <linux/ctype.h>
 #include <linux/slab.h>
+#include <linux/mutex.h>
+
 #include <asm/uaccess.h>
 
 #include "base.h"
@@ -315,8 +318,6 @@ static ssize_t pnp_show_current_resources(struct device *dmdev,
         return ret;
 }
 
-extern struct semaphore pnp_res_mutex;
-
 static ssize_t
 pnp_set_current_resources(struct device *dmdev, struct device_attribute *attr,
                           const char *ubuf, size_t count)
@@ -361,10 +362,10 @@ pnp_set_current_resources(struct device *dmdev, struct device_attribute *attr,
                 goto done;
         }
         if (!strnicmp(buf, "get", 3)) {
-                down(&pnp_res_mutex);
+                mutex_lock(&pnp_res_mutex);
                 if (pnp_can_read(dev))
                         dev->protocol->get(dev, &dev->res);
-                up(&pnp_res_mutex);
+                mutex_unlock(&pnp_res_mutex);
                 goto done;
         }
         if (!strnicmp(buf, "set", 3)) {
@@ -373,7 +374,7 @@ pnp_set_current_resources(struct device *dmdev, struct device_attribute *attr,
                         goto done;
                 buf += 3;
                 pnp_init_resource_table(&dev->res);
-                down(&pnp_res_mutex);
+                mutex_lock(&pnp_res_mutex);
                 while (1) {
                         while (isspace(*buf))
                                 ++buf;
@@ -455,7 +456,7 @@ pnp_set_current_resources(struct device *dmdev, struct device_attribute *attr,
                         }
                         break;
                 }
-                up(&pnp_res_mutex);
+                mutex_unlock(&pnp_res_mutex);
                 goto done;
         }