linux-kernel - Re: [PATCH 1/1] staging: ks7010: Fix cast to restricted __le16 in ks_wlan

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Message-ID: <94305dbb-1356-fd6c-63de-8c7785827451@gmail.com>
Date:   Mon, 3 Jul 2017 06:43:32 +0200
From:   Janusz Lisiecki <janusz.lisiecki@...il.com>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Driver Project Developer List 
        <driverdev-devel@...uxdriverproject.org>,
        devel@...verdev.osuosl.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] staging: ks7010: Fix cast to restricted __le16 in
 ks_wlan_net.c

W dniu 2017-07-02 o 23:23, Luc Van Oostenryck pisze:
> On Sun, Jul 2, 2017 at 10:49 PM, Janusz Lisiecki
> <janusz.lisiecki@...il.com> wrote:
>> W dniu 2017-07-02 o 21:38, Luc Van Oostenryck pisze:
>>
>>> On Sun, Jul 2, 2017 at 4:27 PM, Janusz Lisiecki
>>> <janusz.lisiecki@...il.com> wrote:
>>>> This patch fixes the following Sparse warnings in ks_wlan_net.c:
>>>> drivers/staging/ks7010/ks_wlan_net.c:1359:24: warning: cast to restricted
>>>> __le16
>>>> Both sides of assignment are u16 so (as 'ap' is local_ap_t type and
>>>> 'capability' member,
>>>> have the same as local 'capabilities' type of u16) 'le16_to_cpu' is not
>>>> needed
>>> It could be that it's ap->capability's type that is wrong (not
>>> annotated with __le16).
>>> Isn't it?
>>>
>>> Is ap->capability supposed to hold a little-endian value or a native
>>> order value?
>>>
>>> -- Luc
>> As I see in ks_hostif.c all assignments to link_ap_info_t->capability threat
>> this value as native order (i.e get_ap_information, get_current_ap). As this
>> is not a structure which comes from HW we can do the way you suggested.
>> Still, as all other places in code threats this as native order value I
>> decided to change only one place than many other around to fix Sparse
>> warning.
> Fine, but then please put this explanation in the commit message.
> In others words, be very clear that the change is because ap->capability is in
> native order and thus the conversion le16_to_cpu() is wrong and must be removed.
>
> -- Luc
Done. I hope my message is more verbose and clear this time.

Pozdrawiam,
Janusz Lisiecki


Pozdrawiam,
Janusz Lisiecki