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SubjectRE:[PATCH] drivers:staging:wlan-ng:hfa384x_usb: Fixing sparse warnings.
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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@gmail.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

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