linux-kernel - [PATCH 1/4] char: misc: document behaviour of open()

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Date:	Mon, 23 Mar 2015 13:59:46 +0100
From:	Martin Kepplinger <martink@...teo.de>
To:	tomvanbraeckel@...il.com
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	arnd@...db.de, Martin Kepplinger <martink@...teo.de>
Subject: [PATCH 1/4] char: misc: document behaviour of open()

an open syscall now assignes file->private_data to a pointer to the
miscdevice structure. This reminds people not to duplicate code if
they want this and not to depend on it being NULL.

Signed-off-by: Martin Kepplinger <martink@...teo.de>
---
 drivers/char/misc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index 32ab943..c05e2f4 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -168,7 +168,9 @@ static const struct file_operations misc_fops = {
  *	the minor number requested is used.
  *
  *	The structure passed is linked into the kernel and may not be
- *	destroyed until it has been unregistered.
+ *	destroyed until it has been unregistered. By default, an open()
+ *	syscall to the device sets file->private_data to point to the
+ *	structure. Drivers don't need open in fops for this.
  *
  *	A zero is returned on success and a negative errno code for
  *	failure.
-- 
2.1.4

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