--- linux-3.14/fs/kernfs/file.c.orig	2014-03-31 05:40:15.000000000 +0200
+++ linux-3.14/fs/kernfs/file.c	2014-04-19 08:22:11.754042780 +0200
@@ -458,16 +458,6 @@
 	const struct kernfs_ops *ops;
 	int rc;
 
-	/*
-	 * mmap path and of->mutex are prone to triggering spurious lockdep
-	 * warnings and we don't want to add spurious locking dependency
-	 * between the two.  Check whether mmap is actually implemented
-	 * without grabbing @of->mutex by testing HAS_MMAP flag.  See the
-	 * comment in kernfs_file_open() for more details.
-	 */
-	if (!(of->kn->flags & KERNFS_HAS_MMAP))
-		return -ENODEV;
-
 	mutex_lock(&of->mutex);
 
 	rc = -ENODEV;
@@ -475,7 +468,10 @@
 		goto out_unlock;
 
 	ops = kernfs_ops(of->kn);
+	if (ops->mmap)
+		rc = ops->mmap(of, vma);
+	if (rc)
+		goto out_put;
-	rc = ops->mmap(of, vma);
 
 	/*
 	 * PowerPC's pci_mmap of legacy_mem uses shmem_zero_setup()
--- linux-3.14/fs/sysfs/file.c.old	2014-03-31 05:40:15.000000000 +0200
+++ linux-3.14/fs/sysfs/file.c	2014-04-19 11:18:53.296366182 +0200
@@ -141,7 +141,10 @@
 {
 	struct bin_attribute *battr = of->kn->priv;
 	struct kobject *kobj = of->kn->parent->priv;
-
+	
+	if (!battr->mmap)
+		return -ENODEV;
+	
 	return battr->mmap(of->file, kobj, battr, vma);
 }
 
@@ -194,11 +197,6 @@
 static const struct kernfs_ops sysfs_bin_kfops_rw = {
 	.read		= sysfs_kf_bin_read,
 	.write		= sysfs_kf_bin_write,
-};
-
-static const struct kernfs_ops sysfs_bin_kfops_mmap = {
-	.read		= sysfs_kf_bin_read,
-	.write		= sysfs_kf_bin_write,
 	.mmap		= sysfs_kf_bin_mmap,
 };
 
@@ -234,9 +232,7 @@
 	} else {
 		struct bin_attribute *battr = (void *)attr;
 
-		if (battr->mmap)
-			ops = &sysfs_bin_kfops_mmap;
-		else if (battr->read && battr->write)
+		if ((battr->read && battr->write) || battr->mmap)
 			ops = &sysfs_bin_kfops_rw;
 		else if (battr->read)
 			ops = &sysfs_bin_kfops_ro;