linux-kernel - RE: [PATCH v2 1/1] usb: typec: tcpm: Use LE to CPU conversion when accessing msg->header

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Date:   Fri, 21 May 2021 08:44:12 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Guenter Roeck <linux@...ck-us.net>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Subject: RE: [PATCH v2 1/1] usb: typec: tcpm: Use LE to CPU conversion when
 accessing msg->header

On 19 May 2021 11:04, Andy Shevchenko wrote:

> Sparse is not happy about strict type handling:
>   .../typec/tcpm/tcpm.c:2720:27: warning: restricted __le16 degrades to integer
>   .../typec/tcpm/tcpm.c:2814:32: warning: restricted __le16 degrades to integer
> 
> Fix this by converting LE to CPU before use.
> 
> Fixes: ae8a2ca8a221 ("usb: typec: Group all TCPCI/TCPM code together")
> Fixes: 64f7c494a3c0 ("typec: tcpm: Add support for sink PPS related messages")
> Cc: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>

> ---
> v2: fixed subject prefix
>  drivers/usb/typec/tcpm/tcpm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 64133e586c64..8fdfd7f65ad7 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -2717,7 +2717,7 @@ static void tcpm_pd_ext_msg_request(struct
> tcpm_port *port,
>  	enum pd_ext_msg_type type = pd_header_type_le(msg->header);
>  	unsigned int data_size = pd_ext_header_data_size_le(msg-
> >ext_msg.header);
> 
> -	if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
> +	if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) {
>  		tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP,
> NONE_AMS);
>  		tcpm_log(port, "Unchunked extended messages unsupported");
>  		return;
> @@ -2811,7 +2811,7 @@ static void tcpm_pd_rx_handler(struct kthread_work
> *work)
>  				 "Data role mismatch, initiating error recovery");
>  			tcpm_set_state(port, ERROR_RECOVERY, 0);
>  		} else {
> -			if (msg->header & PD_HEADER_EXT_HDR)
> +			if (le16_to_cpu(msg->header) & PD_HEADER_EXT_HDR)
>  				tcpm_pd_ext_msg_request(port, msg);
>  			else if (cnt)
>  				tcpm_pd_data_request(port, msg);
> --
> 2.30.2