linux-kernel - Re: [PATCH] usb: typec: ucsi: Fix connector check on init

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Message-ID: <Zg0yksaQaGy+ZOaI@kuha.fi.intel.com>
Date: Wed, 3 Apr 2024 13:42:26 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: "Christian A. Ehrhardt" <lk@...e.de>
Cc: linux-kernel@...r.kernel.org,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, stable@...nel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Prashant Malani <pmalani@...omium.org>,
	Jameson Thies <jthies@...gle.com>,
	Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Samuel Čavoj <samuel@...oj.net>,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH] usb: typec: ucsi: Fix connector check on init

On Mon, Apr 01, 2024 at 11:05:15PM +0200, Christian A. Ehrhardt wrote:
> Fix issues when initially checking for a connector change:
> - Use the correct connector number not the entire CCI.
> - Call ->read under the PPM lock.
> - Remove a bogus READ_ONCE.
> 
> Fixes: 808a8b9e0b87 ("usb: typec: ucsi: Check for notifications after init")
> Cc: stable@...nel.org
> Signed-off-by: Christian A. Ehrhardt <lk@...e.de>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/ucsi/ucsi.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index 31d8a46ae5e7..bd6ae92aa39e 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1736,11 +1736,13 @@ static int ucsi_init(struct ucsi *ucsi)
>  	ucsi->connector = connector;
>  	ucsi->ntfy = ntfy;
>  
> +	mutex_lock(&ucsi->ppm_lock);
>  	ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
> +	mutex_unlock(&ucsi->ppm_lock);
>  	if (ret)
>  		return ret;
> -	if (UCSI_CCI_CONNECTOR(READ_ONCE(cci)))
> -		ucsi_connector_change(ucsi, cci);
> +	if (UCSI_CCI_CONNECTOR(cci))
> +		ucsi_connector_change(ucsi, UCSI_CCI_CONNECTOR(cci));
>  
>  	return 0;
>  
> -- 
> 2.40.1

-- 
heikki