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: <43148a2ebe546fde67028d99fd7365acce1311b2.camel@redhat.com>
Date:   Thu, 16 Jul 2020 21:00:00 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.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, 2020-07-16 at 18:47 +0300, Andy Shevchenko wrote:
> 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;

It works (no more oops)

Best regards,
	Maxim Levitsky