linux-kernel - [PATCH] misc: pass miscdevice through file's private

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Date:	Fri,  5 Dec 2014 05:37:54 +0100
From:	Tom Van Braeckel <tomvanbraeckel@...il.com>
To:	arnd@...db.de, gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, samu.p.onkalo@...ia.com,
	Tom Van Braeckel <tomvanbraeckel@...il.com>
Subject: [PATCH] misc: pass miscdevice through file's private_data

Make the miscdevice accessible through the file's private_data.

Previously, this was done only when an open() operation had been registered.
But it's also useful in other file operations so we pass it on unconditionally.

All drivers that use private_data and misc_register() were checked to ensure
they register an open() operation in order to verify that this improvement
does not break any existing driver that uses the misc subsystem.

Signed-off-by: Tom Van Braeckel <tomvanbraeckel@...il.com>
---
 drivers/char/misc.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index ffa97d2..d6445de 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -140,12 +140,17 @@ static int misc_open(struct inode * inode, struct file * file)
 			goto fail;
 	}
 
+	/*
+	 * Place the miscdevice in the file's
+	 * private_data so it can be used by the
+	 * file operations, including f_op->open below
+	 */
+	file->private_data = c;
+
 	err = 0;
 	replace_fops(file, new_fops);
-	if (file->f_op->open) {
-		file->private_data = c;
+	if (file->f_op->open)
 		err = file->f_op->open(inode,file);
-	}
 fail:
 	mutex_unlock(&misc_mtx);
 	return err;
-- 
1.9.1

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