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

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Date:   Wed, 9 Jun 2021 10:46:48 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2 1/1] usb: typec: wcove: Use LE to CPU conversion when
 accessing msg->header

On Wed, Jun 09, 2021 at 08:22:02PM +0300, Andy Shevchenko wrote:
> As LKP noticed the Sparse is not happy about strict type handling:
>    .../typec/tcpm/wcove.c:380:50: sparse:     expected unsigned short [usertype] header
>    .../typec/tcpm/wcove.c:380:50: sparse:     got restricted __le16 const [usertype] header
> 
> Fix this by switching to use pd_header_cnt_le() instead of pd_header_cnt()
> in the affected code.
> 
> Fixes: ae8a2ca8a221 ("usb: typec: Group all TCPCI/TCPM code together")
> Fixes: 3c4fb9f16921 ("usb: typec: wcove: start using tcpm for USB PD support")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> v2: added Rb tag (Heikki), amend Fixes tags (Greg)
>  drivers/usb/typec/tcpm/wcove.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tcpm/wcove.c b/drivers/usb/typec/tcpm/wcove.c
> index 8072e222eb99..20917d85d6f4 100644
> --- a/drivers/usb/typec/tcpm/wcove.c
> +++ b/drivers/usb/typec/tcpm/wcove.c
> @@ -378,7 +378,7 @@ static int wcove_pd_transmit(struct tcpc_dev *tcpc,
>  		const u8 *data = (void *)msg;
>  		int i;
>  
> -		for (i = 0; i < pd_header_cnt(msg->header) * 4 + 2; i++) {
> +		for (i = 0; i < pd_header_cnt_le(msg->header) * 4 + 2; i++) {
>  			ret = regmap_write(wcove->regmap, USBC_TX_DATA + i,
>  					   data[i]);
>  			if (ret)
> -- 
> 2.30.2
>