[PATCH] configsfs buffer: use mutex

Seems copied from sysfs, but I don't see a reason here nor there to use
a semaphore instead of a mutex. Convert.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/fs/configfs/file.c b/fs/configfs/file.c
index 0f4b65e85245..a3658f9a082c 100644
--- a/fs/configfs/file.c
+++ b/fs/configfs/file.c
@@ -27,8 +27,8 @@
 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
-#include <asm/semaphore.h>
 
 #include <linux/configfs.h>
 #include "configfs_internal.h"
@@ -46,7 +46,7 @@ struct configfs_buffer {
         loff_t                  pos;
         char                    * page;
         struct configfs_item_operations * ops;
-        struct semaphore        sem;
+        struct mutex            mutex;
         int                     needs_read_fill;
 };
 
@@ -109,7 +109,7 @@ configfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *pp
         struct configfs_buffer * buffer = file->private_data;
         ssize_t retval = 0;
 
-        down(&buffer->sem);
+        mutex_lock(&buffer->mutex);
         if (buffer->needs_read_fill) {
                 if ((retval = fill_read_buffer(file->f_path.dentry,buffer)))
                         goto out;
@@ -119,7 +119,7 @@ configfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *pp
         retval = simple_read_from_buffer(buf, count, ppos, buffer->page,
                                          buffer->count);
 out:
-        up(&buffer->sem);
+        mutex_unlock(&buffer->mutex);
         return retval;
 }
 
@@ -200,13 +200,13 @@ configfs_write_file(struct file *file, const char __user *buf, size_t count, lof
         struct configfs_buffer * buffer = file->private_data;
         ssize_t len;
 
-        down(&buffer->sem);
+        mutex_lock(&buffer->mutex);
         len = fill_write_buffer(buffer, buf, count);
         if (len > 0)
                 len = flush_write_buffer(file->f_path.dentry, buffer, count);
         if (len > 0)
                 *ppos += len;
-        up(&buffer->sem);
+        mutex_unlock(&buffer->mutex);
         return len;
 }
 
@@ -260,7 +260,7 @@ static int check_perm(struct inode * inode, struct file * file)
                 error = -ENOMEM;
                 goto Enomem;
         }
-        init_MUTEX(&buffer->sem);
+        mutex_init(&buffer->mutex);
         buffer->needs_read_fill = 1;
         buffer->ops = ops;
         file->private_data = buffer;
@@ -299,6 +299,7 @@ static int configfs_release(struct inode * inode, struct file * filp)
         if (buffer) {
                 if (buffer->page)
                         free_page((unsigned long)buffer->page);
+                mutex_destroy(&buffer->mutex);
                 kfree(buffer);
         }
         return 0;