simple_open: automatically convert to simple_open()

Many users of debugfs copy the implementation of default_open() when
they want to support a custom read/write function op.  This leads to a
proliferation of the default_open() implementation across the entire
tree.

Now that the common implementation has been consolidated into libfs we
can replace all the users of this function with simple_open().

This replacement was done with the following semantic patch:

<smpl>
@ open @
identifier open_f != simple_open;
identifier i, f;
@@
-int open_f(struct inode *i, struct file *f)
-{
(
-if (i->i_private)
-f->private_data = i->i_private;
|
-f->private_data = i->i_private;
)
-return 0;
-}

@ has_open depends on open @
identifier fops;
identifier open.open_f;
@@
struct file_operations fops = {
...
-.open = open_f,
+.open = simple_open,
...
};
</smpl>

[[email protected]: checkpatch fixes]
Signed-off-by: Stephen Boyd <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Julia Lawall <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

net/wireless/debugfs.c

@@ -13,12 +13,6 @@
 #include "core.h"
 #include "debugfs.h"
 
-static int cfg80211_open_file_generic(struct inode *inode, struct file *file)
-{
-	file->private_data = inode->i_private;
-	return 0;
-}
-
 #define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...)		\
 static ssize_t name## _read(struct file *file, char __user *userbuf,	\
 			    size_t count, loff_t *ppos)			\
@@ -33,7 +27,7 @@ static ssize_t name## _read(struct file *file, char __user *userbuf,	\
 									\
 static const struct file_operations name## _ops = {			\
 	.read = name## _read,						\
-	.open = cfg80211_open_file_generic,				\
+	.open = simple_open,						\
 	.llseek = generic_file_llseek,					\
 };
 
@@ -102,7 +96,7 @@ static ssize_t ht40allow_map_read(struct file *file,
 
 static const struct file_operations ht40allow_map_ops = {
 	.read = ht40allow_map_read,
-	.open = cfg80211_open_file_generic,
+	.open = simple_open,
 	.llseek = default_llseek,
 };