drivers: misc: pass miscdevice pointer via file private data

For misc devices, inode->i_cdev doesn't point to the device drivers own
data.  Link between file operations and device driver internal data is
lost.  Pass pointer to misc device struct via file private data for driver
open function use.

Signed-off-by: Samu Onkalo <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: Samu Onkalo

drivers/char/misc.c

@@ -144,6 +144,7 @@ static int misc_open(struct inode * inode, struct file * file)
 	old_fops = file->f_op;
 	file->f_op = new_fops;
 	if (file->f_op->open) {
+		file->private_data = c;
 		err=file->f_op->open(inode,file);
 		if (err) {
 			fops_put(file->f_op);