linux-kernel - Re: [PATCH] staging: wilc1000: Fix incorrent type in assignment

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Message-ID: <d71296ff-1de3-3af7-7ade-02e4ced08e7e@microchip.com>
Date:   Tue, 26 Feb 2019 06:39:28 +0000
From:   <Ajay.Kathat@...rochip.com>
To:     <tsu.yubo@...il.com>, <Adham.Abozaeid@...rochip.com>,
        <gregkh@...uxfoundation.org>
CC:     <devel@...verdev.osuosl.org>, <linux-wireless@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yuzibode@....com>
Subject: Re: [PATCH] staging: wilc1000: Fix incorrent type in assignment



On 2/26/2019 8:58 AM, Bo YU wrote:
> The patch fixes following sparse warning:
> 
> drivers/staging/wilc1000/host_interface.c:450:30: warning: incorrect type in assignment (different base types)
> drivers/staging/wilc1000/host_interface.c:450:30:    expected restricted __le16 [usertype] beacon_period
> drivers/staging/wilc1000/host_interface.c:450:30:    got unsigned short [usertype] beacon_interval
> drivers/staging/wilc1000/host_interface.c:451:25: warning: incorrect type in assignment (different base types)
> drivers/staging/wilc1000/host_interface.c:451:25:    expected restricted __le16 [usertype] cap_info
> drivers/staging/wilc1000/host_interface.c:451:25:    got unsigned short [usertype] capability
> 
> Signed-off-by: Bo YU <tsu.yubo@...il.com>
> ---
> I have no hardware to test it and just to compile it

Thanks for submitting the patch.

The correct way to fix above spare warning is by using cpu_to_le16()
while filing the information in ->beacon_period and ->cap_info because
wilc1000 module expects the data in _le_ byte order.

Please changes the below lines in host_interface.c and resubmit the patch.
	param->beacon_period = bss->beacon_interval;
	param->cap_info = bss->capability;
to
	param->beacon_period = cpu_to_le16(bss->beacon_interval);
	param->cap_info = cpu_to_le16(bss->capability);

> ---
>  drivers/staging/wilc1000/host_interface.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/wilc1000/host_interface.c b/drivers/staging/wilc1000/host_interface.c
> index 50dc2dd942f5..cdcb52aec779 100644
> --- a/drivers/staging/wilc1000/host_interface.c
> +++ b/drivers/staging/wilc1000/host_interface.c
> @@ -106,10 +106,10 @@ struct wilc_join_bss_param {
>  	u8 ssid_terminator;
>  	u8 bss_type;
>  	u8 ch;
> -	__le16 cap_info;
> +	u16 cap_info;
>  	u8 sa[ETH_ALEN];
>  	u8 bssid[ETH_ALEN];
> -	__le16 beacon_period;
> +	u16 beacon_period;
>  	u8 dtim_period;
>  	u8 supp_rates[WILC_MAX_RATES_SUPPORTED + 1];
>  	u8 wmm_cap;
> 

Regards,
Ajay