From 67c50bf292c1c02ec7ca548049c53cc08dc75ed1 Mon Sep 17 00:00:00 2001 From: Martin Kepplinger Date: Tue, 24 Mar 2015 11:51:20 +1030 Subject: lguest: explicitly set miscdevice's private_data NULL There is a proposed change to the miscdevice's behaviour on open(). Currently file->private_data stays NULL, but only because we don't have an open-entry in struct file_operations. This may change so that private_data, more consistently, is always set to struct miscdevice, not only *if* the driver has it's own open() routine and fops-entry, see https://lkml.org/lkml/2014/12/4/939 and commit 94e4fe2cab3d43b3ba7c3f721743006a8c9d913a In short: If we rely on file->private_data being NULL, we should ensure it is NULL ourselves. Signed-off-by: Martin Kepplinger Signed-off-by: Rusty Russell --- drivers/lguest/lguest_user.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index c4c6113eb9a6..30c60687d277 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -339,6 +339,13 @@ static ssize_t write(struct file *file, const char __user *in, } } +static int open(struct inode *inode, struct file *file) +{ + file->private_data = NULL; + + return 0; +} + /*L:060 * The final piece of interface code is the close() routine. It reverses * everything done in initialize(). This is usually called because the @@ -409,6 +416,7 @@ static int close(struct inode *inode, struct file *file) */ static const struct file_operations lguest_fops = { .owner = THIS_MODULE, + .open = open, .release = close, .write = write, .read = read, -- cgit v1.2.3