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, 1 insertions, 12 deletions

diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 18657f001b43..72d0b412c376 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -675,19 +675,8 @@ static ssize_t
 bm_status_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 {
         char *s = enabled ? "enabled" : "disabled";
-        int len = strlen(s);
-        loff_t pos = *ppos;
 
-        if (pos < 0)
-                return -EINVAL;
-        if (pos >= len)
-                return 0;
-        if (len < pos + nbytes)
-                nbytes = len - pos;
-        if (copy_to_user(buf, s + pos, nbytes))
-                return -EFAULT;
-        *ppos = pos + nbytes;
-        return nbytes;
+        return simple_read_from_buffer(buf, nbytes, ppos, s, strlen(s));
 }
 
 static ssize_t bm_status_write(struct file * file, const char __user * buffer,