linux-kernel - Re: [PATCH 2/2] usb: typec: class: Invalidate USB device pointers on partner unregistration

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Message-ID: <Z93z5WqL-u4ZyBhH@google.com>
Date: Fri, 21 Mar 2025 23:19:01 +0000
From: Benson Leung <bleung@...gle.com>
To: Andrei Kuchynski <akuchynski@...omium.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benson Leung <bleung@...omium.org>,
	Jameson Thies <jthies@...gle.com>, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] usb: typec: class: Invalidate USB device pointers on
 partner unregistration

Hi Andrei,

On Fri, Mar 21, 2025 at 02:37:27PM +0000, Andrei Kuchynski wrote:
> To avoid using invalid USB device pointers after a Type-C partner
> disconnects, this patch clears the pointers upon partner unregistration.
> This ensures a clean state for future connections.
> 
> Cc: stable@...r.kernel.org
> Fixes: 59de2a56d127 ("usb: typec: Link enumerated USB devices with Type-C partner")
> Signed-off-by: Andrei Kuchynski <akuchynski@...omium.org>

Reviewed-by: Benson Leung <bleung@...omium.org>

> ---
>  drivers/usb/typec/class.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index eadb150223f8..3df3e3736916 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -1086,10 +1086,14 @@ void typec_unregister_partner(struct typec_partner *partner)
>  	port = to_typec_port(partner->dev.parent);
>  
>  	mutex_lock(&port->partner_link_lock);
> -	if (port->usb2_dev)
> +	if (port->usb2_dev) {
>  		typec_partner_unlink_device(partner, port->usb2_dev);
> -	if (port->usb3_dev)
> +		port->usb2_dev = NULL;
> +	}
> +	if (port->usb3_dev) {
>  		typec_partner_unlink_device(partner, port->usb3_dev);
> +		port->usb3_dev = NULL;
> +	}
>  
>  	device_unregister(&partner->dev);
>  	mutex_unlock(&port->partner_link_lock);
> -- 
> 2.49.0.395.g12beb8f557-goog
> 

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