linux-kernel - Re: [PATCH] staging: rtl8723au: change typecast to match type returned by htons()

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Date:	Mon, 10 Nov 2014 21:28:37 +0100
From:	Arend van Spriel <arend@...adcom.com>
To:	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Chris Ruffin <cmruffin@...il.com>
CC:	<linux-wireless@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devel@...verdev.osuosl.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] staging: rtl8723au: change typecast to match type returned
 by htons()

On 10-11-14 21:21, Jes Sorensen wrote:
> Chris Ruffin <cmruffin@...il.com> writes:
>> Using a u16 pointer typecast for a result from htons() results in the following warning from sparse:
>>
>> drivers/staging/rtl8723au/core/rtw_xmit.c:1279:36: warning: incorrect type in assignment (different base types)
>> drivers/staging/rtl8723au/core/rtw_xmit.c:1279:36:    expected unsigned short [unsigned] [short] [usertype] <noident>
>> drivers/staging/rtl8723au/core/rtw_xmit.c:1279:36:    got restricted __be16 [usertype] <noident>
>>
>> This patch fixes the issue by using an endian-specific typecast
>> that will always match the type returned by htons().
>>
>> Signed-off-by: Chris Ruffin <cmruffin@...il.com>
>> ---
>>  drivers/staging/rtl8723au/core/rtw_xmit.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Looks fine to me
> 
> Signed-off-by: Jes Sorensen <Jes.Sorensen@...hat.com>
> 
>>
>> diff --git a/drivers/staging/rtl8723au/core/rtw_xmit.c b/drivers/staging/rtl8723au/core/rtw_xmit.c
>> index a0f7e27..44ef55c 100644
>> --- a/drivers/staging/rtl8723au/core/rtw_xmit.c
>> +++ b/drivers/staging/rtl8723au/core/rtw_xmit.c
>> @@ -1276,7 +1276,7 @@ s32 rtw_put_snap23a(u8 *data, u16 h_proto)
>>  	snap->oui[0] = oui[0];
>>  	snap->oui[1] = oui[1];
>>  	snap->oui[2] = oui[2];
>> -	*(u16 *)(data + SNAP_SIZE) = htons(h_proto);
>> +	*(__be16 *)(data + SNAP_SIZE) = htons(h_proto);

Could (data + SNAP_SIZE) be on a unaligned address?

Regards,
Arend

>>  	return SNAP_SIZE + sizeof(u16);
>>  }
> --
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