linux-kernel - [PATCH] char: misc: assign file->private

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Message-Id: <1371819665-3882-1-git-send-email-thomas.petazzoni@free-electrons.com>
Date:	Fri, 21 Jun 2013 15:01:05 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Samu Onkalo <samu.p.onkalo@...ia.com>,
	michael.opdenacker@...e-electrons.com,
	gregory.clement@...e-electrons.com,
	maxime.ripard@...e-electrons.com,
	alexandre.belloni@...e-electrons.com
Subject: [PATCH] char: misc: assign file->private_data in all cases

In fa1f68db6ca ("drivers: misc: pass miscdevice pointer via file
private data"), the misc driver infrastructure was changed to assigned
file->private_data as a pointer to the 'struct miscdevice' that
corresponds to the device being opened.

However, this assignment was only done when the misc driver was
declaring a driver-specific ->open() operation in its
file_operations. This doesn't make sense, as the driver may not
necessarily have a custom ->open() operation, and might still be
interested in having file->private_data properly set for use in its
->read() and write() operations.

Therefore, we move the assignment of file->private_data outside of the
condition that tests whether a driver-specific ->open() operation was
defined.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
---
 drivers/char/misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index 190d442..fd504d3 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -143,8 +143,8 @@ static int misc_open(struct inode * inode, struct file * file)
 	err = 0;
 	old_fops = file->f_op;
 	file->f_op = new_fops;
+	file->private_data = c;
 	if (file->f_op->open) {
-		file->private_data = c;
 		err=file->f_op->open(inode,file);
 		if (err) {
 			fops_put(file->f_op);
-- 
1.8.1.2

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