use simple_read_from_buffer() in fs/

Cleanup using simple_read_from_buffer() in binfmt_misc, configfs, and sysfs.

Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 31 deletions

diff --git a/fs/configfs/file.c b/fs/configfs/file.c
index d98be5e01328..3527c7c6def8 100644
--- a/fs/configfs/file.c
+++ b/fs/configfs/file.c
@@ -77,36 +77,6 @@ static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buf
         return ret;
 }
 
-
-/**
- *      flush_read_buffer - push buffer to userspace.
- *      @buffer:        data buffer for file.
- *      @userbuf:       user-passed buffer.
- *      @count:         number of bytes requested.
- *      @ppos:          file position.
- *
- *      Copy the buffer we filled in fill_read_buffer() to userspace.
- *      This is done at the reader's leisure, copying and advancing
- *      the amount they specify each time.
- *      This may be called continuously until the buffer is empty.
- */
-static int flush_read_buffer(struct configfs_buffer * buffer, char __user * buf,
-                             size_t count, loff_t * ppos)
-{
-        int error;
-
-        if (*ppos > buffer->count)
-                return 0;
-
-        if (count > (buffer->count - *ppos))
-                count = buffer->count - *ppos;
-
-        error = copy_to_user(buf,buffer->page + *ppos,count);
-        if (!error)
-                *ppos += count;
-        return error ? -EFAULT : count;
-}
-
 /**
  *      configfs_read_file - read an attribute.
  *      @file:  file pointer.
@@ -139,7 +109,8 @@ configfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *pp
         }
         pr_debug("%s: count = %zd, ppos = %lld, buf = %s\n",
                  __FUNCTION__, count, *ppos, buffer->page);
-        retval = flush_read_buffer(buffer,buf,count,ppos);
+        retval = simple_read_from_buffer(buf, count, ppos, buffer->page,
+                                         buffer->count);
 out:
         up(&buffer->sem);
         return retval;