[PATCH] char: documentation: more useful information about misc device

[Martin Kepplinger <martink@posteo.de>]

This might prevent code duplication in the future.

Signed-off-by: Martin Kepplinger <martink@posteo.de>
---
This is a suggestion for a place to put this information. I think this
makes sense but there might be a more appropriate place elsewhere.

 drivers/char/misc.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index ffa97d2..6a3d15b 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -171,6 +171,10 @@ static const struct file_operations misc_fops = {
  *	The structure passed is linked into the kernel and may not be
  *	destroyed until it has been unregistered.
  *
+ *	If struct miscdevice's fops contain an implementation of open()
+ *	the struct file's private data will be a pointer back to
+ *	struct miscdevice.
+ *
  *	A zero is returned on success and a negative errno code for
  *	failure.
  */
-- 
1.7.10.4