linux-kernel - Re: kernel oops in 'typec_ucsi' due to commit 'drivers property: When no children in primary, try secondary'

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Message-ID: <20200716154721.GO3703480@smile.fi.intel.com>
Date:   Thu, 16 Jul 2020 18:47:21 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     linux-kernel@...r.kernel.org, rafael.j.wysocki@...el.com,
        sakari.ailus@...ux.intel.com, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org
Subject: Re: kernel oops in 'typec_ucsi' due to commit 'drivers property:
 When no children in primary, try secondary'

On Thu, Jul 16, 2020 at 11:17:03AM +0300, Maxim Levitsky wrote:
> Hi!
> 
> Few days ago I bisected a regression on 5.8 kernel:
> 
> I have nvidia rtx 2070s and its USB type C port driver (which is open source)
> started to crash on load:

...

> Reverting the commit helped fix this oops.
> 
> My .config attached.
> If any more info is needed I'll be happy to provide it,
> and of course test patches.

Can you test below?

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 1e6d75e65938..d58aa98fe964 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -721,7 +721,7 @@ struct fwnode_handle *device_get_next_child_node(struct device *dev,
 		return next;
 
 	/* When no more children in primary, continue with secondary */
-	if (!IS_ERR_OR_NULL(fwnode->secondary))
+	if (fwnode && !IS_ERR_OR_NULL(fwnode->secondary))
 		next = fwnode_get_next_child_node(fwnode->secondary, child);
 
 	return next;
-- 
With Best Regards,
Andy Shevchenko