linux-kernel - Re: [PATCH] mwifiex: Fixed endianness for event TLV type TLV_BTCOEX_WL

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Message-ID: <CAEO8o4=_L6oYeTXMv3KYbBbhSsG3aHNhm9tqC0anVy=vfR35-A@mail.gmail.com>
Date:	Thu, 30 Jun 2016 14:09:15 +0530
From:	Prasun Maiti <prasunmaiti87@...il.com>
To:	Amitkumar Karwar <akarwar@...vell.com>
Cc:	Nishant Sarmukadam <nishants@...vell.com>,
	Kalle Valo <kvalo@...eaurora.org>,
	Linux Wireless <linux-wireless@...r.kernel.org>,
	Linux Next <linux-next@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mwifiex: Fixed endianness for event TLV type TLV_BTCOEX_WL_SCANTIME

On Thu, Jun 30, 2016 at 1:05 PM, Amitkumar Karwar <akarwar@...vell.com> wrote:
> Hi Prasun,
>
>> From: Prasun Maiti [mailto:prasunmaiti87@...il.com]
>> Sent: Friday, June 24, 2016 12:27 PM
>> To: Amitkumar Karwar; Nishant Sarmukadam; Kalle Valo
>> Cc: Linux Wireless; Linux Next; Linux Kernel
>> Subject: Re: [PATCH] mwifiex: Fixed endianness for event TLV type
>> TLV_BTCOEX_WL_SCANTIME
>>
>> On Thu, Jun 16, 2016 at 9:49 AM, Prasun Maiti <prasunmaiti87@...il.com>
>> wrote:
>> > The two members min_scan_time and max_scan_time of structure
>> > "mwifiex_ie_types_btcoex_scan_time" are of two bytes each. The values
>> > are assigned directtly from firmware without endian conversion
>> handling.
>> > So, wrong datas will get saved in big-endian systems.
>> >
>> > This patch converts the values into cpu's byte order before assigning
>> > them into the local members.
>> >
>> > Signed-off-by: Prasun Maiti <prasunmaiti87@...il.com>
>> > ---
>> >  drivers/net/wireless/marvell/mwifiex/sta_event.c | 4 ++--
>> >  1 file changed, 2 insertions(+), 2 deletions(-)
>> >
>> > diff --git a/drivers/net/wireless/marvell/mwifiex/sta_event.c
>> > b/drivers/net/wireless/marvell/mwifiex/sta_event.c
>> > index 0104108..7dff452 100644
>> > --- a/drivers/net/wireless/marvell/mwifiex/sta_event.c
>> > +++ b/drivers/net/wireless/marvell/mwifiex/sta_event.c
>> > @@ -474,8 +474,8 @@ void
>> mwifiex_bt_coex_wlan_param_update_event(struct mwifiex_private *priv,
>> >                         scantlv =
>> >                             (struct mwifiex_ie_types_btcoex_scan_time
>> *)tlv;
>> >                         adapter->coex_scan = scantlv->coex_scan;
>> > -                       adapter->coex_min_scan_time = scantlv-
>> >min_scan_time;
>> > -                       adapter->coex_max_scan_time = scantlv-
>> >max_scan_time;
>> > +                       adapter->coex_min_scan_time =
>> le16_to_cpu(scantlv->min_scan_time);
>> > +                       adapter->coex_max_scan_time =
>> > + le16_to_cpu(scantlv->max_scan_time);
>> >                         break;
>> >
>> >                 default:
>> > --
>> > 1.9.1
>> >
>
> Along with this change, you need to define these elements as __le16 in scan_tlv structure. Ensure that sparse compilation is passed with your final patch.
>

Hi Amitkumar,

Thanks for your suggestion.
I have added this in scan_tlv structure to fix the sparse compilation
warnings. Updated patch v2 is sent.
Please verify this.

-- 
Thanks,
Prasun