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

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Date:   Wed, 19 May 2021 12:05:00 -0700
From:   Guenter Roeck <linux@...ck-us.net>
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-kernel@...r.kernel.org
Cc:     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 5/19/21 3:03 AM, 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: Guenter Roeck <linux@...ck-us.net>

> ---
> 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);
>