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Date:   Sun, 24 May 2020 09:43:14 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        kernel test robot <rong.a.chen@...el.com>,
        stable <stable@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 1/2] software node: implement software_node_unregister()

On 5/24/20 8:30 AM, Greg Kroah-Hartman wrote:
> Sometimes it is better to unregister individual nodes instead of trying
> to do them all at once with software_node_unregister_nodes(), so create
> software_node_unregister() so that you can unregister them one at a
> time.
> 
> This is especially important when creating nodes in a hierarchy, with
> parent -> children representations.  Children always need to be removed
> before a parent is, as the swnode logic assumes this is going to be the
> case.
> 
> Fix up the lib/test_printf.c fwnode_pointer() test which to use this new
> function as it had the problem of tearing things down in the backwards
> order.
> 
> Fixes: f1ce39df508d ("lib/test_printf: Add tests for %pfw printk modifier")
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Reported-by: kernel test robot <rong.a.chen@...el.com>
> Cc: stable <stable@...r.kernel.org>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Brendan Higgins <brendanhiggins@...gle.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Both patches pass my boot tests on arm64 and arm64be (I didn't test any others).
So, FWIW,

Tested-by: Guenter Roeck <linux@...ck-us.net>

I wasn't sure it the two patches replace or fix commit 4ef12f719802 ("kobject:
Make sure the parent does not get released before its children"), so I tried
to re-apply 4ef12f719802 on top of the two patches. Unfortunately that still
results in crashes and UAF messages.

Guenter

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