linux-kernel - RE:[PATCH] drivers:staging:wlan-ng:hfa384x

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Date:   Sun, 30 Apr 2017 18:26:00 +0200
From:   Karim Eshapa <karim.eshapa@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, Karim Eshapa <karim.eshapa@...il.com>
Subject: RE:[PATCH] drivers:staging:wlan-ng:hfa384x_usb: Fixing sparse warnings.

On Fri, 28 Apr 2017 12:02:58 +0200, Greg KH wrote:
> On Wed, Apr 26, 2017 at 06:15:40PM +0200, Karim Eshapa wrote:
>
>> Fixing sparse warnings incorrect type assignment.
>>
>> Signed-off-by: Karim Eshapa <karim.eshapa@...il.com>
>> ---
>>  drivers/staging/wlan-ng/hfa384x_usb.c | 24 ++++++++++++++----------
>>  1 file changed, 14 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/staging/wlan-ng/hfa384x_usb.c b/drivers/staging/wlan-ng/hfa384x_usb.c
>> index 6134eba..cf6bf65 100644
>> --- a/drivers/staging/wlan-ng/hfa384x_usb.c
>> +++ b/drivers/staging/wlan-ng/hfa384x_usb.c
>> @@ -3511,20 +3511,24 @@ static void hfa384x_int_rxmonitor(struct wlandevice *wlandev,
>>               datap = skb_put(skb, sizeof(struct p80211_caphdr));
>>               caphdr = (struct p80211_caphdr *)datap;
>>
>> -             caphdr->version = htonl(P80211CAPTURE_VERSION);
>> -             caphdr->length = htonl(sizeof(struct p80211_caphdr));
>> +             caphdr->version = __be32_to_cpu(htonl(P80211CAPTURE_VERSION));
>> +             caphdr->length = __be32_to_cpu( htonl(sizeof(
>> +                                             struct p80211_caphdr)));
>>

> How do you know this is correct?  And why the odd ' ' usage?  I can't
> take this patch for that reason alone...
>

Actually using __be32_to_cpu may result in a problem if it's built for le machine.
becasue if the network byte order needs to be represented in __be32 such that the 
header is going through the network in a right order.
So, I suggest if we can change the structure's args type into __be32 that I don't 
trust it if it can force the arg to be big endian as it's defined as  __attribute__((bitwise))
that I'm not sure if it's GNU C attribute. 
that I didn't want from the beginning.

Thanks,
Karim