Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [char-misc-next] Revert "mei: hdcp: Replace one-element array
 with flexible-array member"
To:     "Winkler, Tomas" <tomas.winkler@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     "Usyskin, Alexander" <alexander.usyskin@intel.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Gustavo A . R . Silva" <gustavoars@kernel.org>
References: <20200728214139.3129532-1-tomas.winkler@intel.com>
 <e80a9e75-4497-1587-deab-b5c6a0fcc48f@embeddedor.com>
 <8ec7601780b542c2bc0168e03749ec0e@intel.com>
From:   "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Autocrypt: addr=gustavo@embeddedor.com; keydata=
 xsFNBFssHAwBEADIy3ZoPq3z5UpsUknd2v+IQud4TMJnJLTeXgTf4biSDSrXn73JQgsISBwG
 2Pm4wnOyEgYUyJd5tRWcIbsURAgei918mck3tugT7AQiTUN3/5aAzqe/4ApDUC+uWNkpNnSV
 tjOx1hBpla0ifywy4bvFobwSh5/I3qohxDx+c1obd8Bp/B/iaOtnq0inli/8rlvKO9hp6Z4e
 DXL3PlD0QsLSc27AkwzLEc/D3ZaqBq7ItvT9Pyg0z3Q+2dtLF00f9+663HVC2EUgP25J3xDd
 496SIeYDTkEgbJ7WYR0HYm9uirSET3lDqOVh1xPqoy+U9zTtuA9NQHVGk+hPcoazSqEtLGBk
 YE2mm2wzX5q2uoyptseSNceJ+HE9L+z1KlWW63HhddgtRGhbP8pj42bKaUSrrfDUsicfeJf6
 m1iJRu0SXYVlMruGUB1PvZQ3O7TsVfAGCv85pFipdgk8KQnlRFkYhUjLft0u7CL1rDGZWDDr
 NaNj54q2CX9zuSxBn9XDXvGKyzKEZ4NY1Jfw+TAMPCp4buawuOsjONi2X0DfivFY+ZsjAIcx
 qQMglPtKk/wBs7q2lvJ+pHpgvLhLZyGqzAvKM1sVtRJ5j+ARKA0w4pYs5a5ufqcfT7dN6TBk
 LXZeD9xlVic93Ju08JSUx2ozlcfxq+BVNyA+dtv7elXUZ2DrYwARAQABzStHdXN0YXZvIEEu
 IFIuIFNpbHZhIDxndXN0YXZvYXJzQGtlcm5lbC5vcmc+wsGrBBMBCAA+FiEEkmRahXBSurMI
 g1YvRwW0y0cG2zEFAl6zFvQCGyMFCQlmAYAFCwkIBwIGFQoJCAsCBBYCAwECHgECF4AAIQkQ
 RwW0y0cG2zEWIQSSZFqFcFK6swiDVi9HBbTLRwbbMZsEEACWjJyXLjtTAF21Vuf1VDoGzitP
 oE69rq9UhXIGR+e0KACyIFoB9ibG/1j/ESMa0RPSwLpJDLgfvi/I18H/9cKtdo2uz0XNbDT8
 i3llIu0b43nzGIDzRudINBXC8Coeob+hrp/MMZueyzt0CUoAnY4XqpHQbQsTfTrpFeHT02Qz
 ITw6kTSmK7dNbJj2naH2vSrU11qGdU7aFzI7jnVvGgv4NVQLPxm/t4jTG1o+P1Xk4N6vKafP
 zqzkxj99JrUAPt+LyPS2VpNvmbSNq85PkQ9gpeTHpkio/D9SKsMW62njITPgy6M8TFAmx8JF
 ZAI6k8l1eU29F274WnlQ6ZokkJoNctwHa+88euWKHWUDolCmQpegJJ8932www83GLn1mdUZn
 NsymjFSdMWE+y8apWaV9QsDOKWf7pY2uBuE6GMPRhX7e7h5oQwa1lYeO2L9LTDeXkEOJe+hE
 qQdEEvkC/nok0eoRlBlZh433DQlv4+IvSsfN/uWld2TuQFyjDCLIm1CPRfe7z0TwiCM27F+O
 lHnUspCFSgpnrxqNH6CM4aj1EF4fEX+ZyknTSrKL9BGZ/qRz7Xe9ikU2/7M1ov6rOXCI4NR9
 THsNax6etxCBMzZs2bdMHMcajP5XdRsOIARuN08ytRjDolR2r8SkTN2YMwxodxNWWDC3V8X2
 RHZ4UwQw487BTQRbLBwMARAAsHCE31Ffrm6uig1BQplxMV8WnRBiZqbbsVJBH1AAh8tq2ULl
 7udfQo1bsPLGGQboJSVN9rckQQNahvHAIK8ZGfU4Qj8+CER+fYPp/MDZj+t0DbnWSOrG7z9H
 IZo6PR9z4JZza3Hn/35jFggaqBtuydHwwBANZ7A6DVY+W0COEU4of7CAahQo5NwYiwS0lGis
 LTqks5R0Vh+QpvDVfuaF6I8LUgQR/cSgLkR//V1uCEQYzhsoiJ3zc1HSRyOPotJTApqGBq80
 X0aCVj1LOiOF4rrdvQnj6iIlXQssdb+WhSYHeuJj1wD0ZlC7ds5zovXh+FfFl5qH5RFY/qVn
 3mNIVxeO987WSF0jh+T5ZlvUNdhedGndRmwFTxq2Li6GNMaolgnpO/CPcFpDjKxY/HBUSmaE
 9rNdAa1fCd4RsKLlhXda+IWpJZMHlmIKY8dlUybP+2qDzP2lY7kdFgPZRU+ezS/pzC/YTzAv
 CWM3tDgwoSl17vnZCr8wn2/1rKkcLvTDgiJLPCevqpTb6KFtZosQ02EGMuHQI6Zk91jbx96n
 rdsSdBLGH3hbvLvjZm3C+fNlVb9uvWbdznObqcJxSH3SGOZ7kCHuVmXUcqozol6ioMHMb+In
 rHPP16aVDTBTPEGwgxXI38f7SUEn+NpbizWdLNz2hc907DvoPm6HEGCanpcAEQEAAcLBZQQY
 AQgADwUCWywcDAIbDAUJCWYBgAAKCRBHBbTLRwbbMdsZEACUjmsJx2CAY+QSUMebQRFjKavw
 XB/xE7fTt2ahuhHT8qQ/lWuRQedg4baInw9nhoPE+VenOzhGeGlsJ0Ys52sdXvUjUocKgUQq
 6ekOHbcw919nO5L9J2ejMf/VC/quN3r3xijgRtmuuwZjmmi8ct24TpGeoBK4WrZGh/1hAYw4
 ieARvKvgjXRstcEqM5thUNkOOIheud/VpY+48QcccPKbngy//zNJWKbRbeVnimua0OpqRXhC
 rEVm/xomeOvl1WK1BVO7z8DjSdEBGzbV76sPDJb/fw+y+VWrkEiddD/9CSfgfBNOb1p1jVnT
 2mFgGneIWbU0zdDGhleI9UoQTr0e0b/7TU+Jo6TqwosP9nbk5hXw6uR5k5PF8ieyHVq3qatJ
 9K1jPkBr8YWtI5uNwJJjTKIA1jHlj8McROroxMdI6qZ/wZ1ImuylpJuJwCDCORYf5kW61fcr
 HEDlIvGc371OOvw6ejF8ksX5+L2zwh43l/pKkSVGFpxtMV6d6J3eqwTafL86YJWH93PN+ZUh
 6i6Rd2U/i8jH5WvzR57UeWxE4P8bQc0hNGrUsHQH6bpHV2lbuhDdqo+cM9ehGZEO3+gCDFmK
 rjspZjkJbB5Gadzvts5fcWGOXEvuT8uQSvl+vEL0g6vczsyPBtqoBLa9SNrSVtSixD1uOgyt
 AP7RWS474w==
Message-ID: <d6ef8ca4-6e11-b758-0e24-75301e1a5303@embeddedor.com>
Date:   Tue, 28 Jul 2020 17:14:36 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.8.0
MIME-Version: 1.0
In-Reply-To: <8ec7601780b542c2bc0168e03749ec0e@intel.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


On 7/28/20 17:01, Winkler, Tomas wrote:
> 
> 
>> -----Original Message-----
>> From: Gustavo A. R. Silva <gustavo@embeddedor.com>
>> Sent: Wednesday, July 29, 2020 00:57
>> To: Winkler, Tomas <tomas.winkler@intel.com>; Greg Kroah-Hartman
>> <gregkh@linuxfoundation.org>
>> Cc: Usyskin, Alexander <alexander.usyskin@intel.com>; linux-
>> kernel@vger.kernel.org; Gustavo A . R . Silva <gustavoars@kernel.org>
>> Subject: Re: [char-misc-next] Revert "mei: hdcp: Replace one-element array
>> with flexible-array member"
>>
>> Hi Tomas,
>>
>> On 7/28/20 16:41, Tomas Winkler wrote:
>>> Greg please revert, this commit it changes size of struct
>>> wired_cmd_repeater_auth_stream_req_in, this is not what firmware is
>>> expecting.
>>
>> Could you elaborate on what's the firmware expecting, exactly?
> struct wired_cmd_repeater_auth_stream_req_in {
>   -	struct hdcp2_streamid_type	streams[1];
>   + 	struct hdcp2_streamid_type	streams[];
> }
> 
> But then you have, which you haven't changed to + 1
> byte = mei_cldev_send(cldev, (u8 *)&verify_mprime_in,
>                               sizeof(verify_mprime_in));
> 

I see, this is the kind of feedback I need from people that knows the
code better. Thanks!

> But that's not the major point. Point is that we should be able to review
> and test the code before it is merged.  You haven't run it, right? 
> There is MAINTAINERS file for a reason. 
> 

I'm using this command:

$ scripts/get_maintainer.pl --nokeywords --nogit --nogit-fallback

and this is the output for both files:

$ scripts/get_maintainer.pl --nokeywords --nogit --nogit-fallback drivers/misc/mei/hdcp/mei_hdcp.c
Arnd Bergmann <arnd@arndb.de> (supporter:CHAR and MISC DRIVERS)
Greg Kroah-Hartman <gregkh@linuxfoundation.org> (supporter:CHAR and MISC DRIVERS)
linux-kernel@vger.kernel.org (open list)
$ scripts/get_maintainer.pl --nokeywords --nogit --nogit-fallback drivers/misc/mei/hdcp/mei_hdcp.h
Arnd Bergmann <arnd@arndb.de> (supporter:CHAR and MISC DRIVERS)
Greg Kroah-Hartman <gregkh@linuxfoundation.org> (supporter:CHAR and MISC DRIVERS)
linux-kernel@vger.kernel.org (open list)

For some reason you don't appear on the list above. Do you see anything wrong with
the command I'm running to get the maintainers and lists?

Thanks
--
Gustavo

>>
>>> I really do not appreciate that the code is bypassing driver maintaner
>>> review, I think this is a minimum we can ask for, this is not for a
>>> first time.
>>>
>>> This reverts commit c56967d674e361ebe716e66992e3c5332b25ac1f.
>>>
>>> Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
>>> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
>>> ---
>>>  drivers/misc/mei/hdcp/mei_hdcp.c | 2 +-
>>> drivers/misc/mei/hdcp/mei_hdcp.h | 2 +-
>>>  2 files changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>>> b/drivers/misc/mei/hdcp/mei_hdcp.c
>>> index d1d3e025ca0e..e6c3dc595617 100644
>>> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
>>> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>>> @@ -572,7 +572,7 @@ static int mei_hdcp_verify_mprime(struct device
>> *dev,
>>>  	       HDCP_2_2_MPRIME_LEN);
>>>  	drm_hdcp_cpu_to_be24(verify_mprime_in.seq_num_m, data-
>>> seq_num_m);
>>>  	memcpy(verify_mprime_in.streams, data->streams,
>>> -	       array_size(data->k, sizeof(*data->streams)));
>>> +	       (data->k * sizeof(struct hdcp2_streamid_type)));
>>>
>>>  	verify_mprime_in.k = cpu_to_be16(data->k);
>>>
>>> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.h
>>> b/drivers/misc/mei/hdcp/mei_hdcp.h
>>> index 834757f5e072..18ffc773fa18 100644
>>> --- a/drivers/misc/mei/hdcp/mei_hdcp.h
>>> +++ b/drivers/misc/mei/hdcp/mei_hdcp.h
>>> @@ -358,7 +358,7 @@ struct wired_cmd_repeater_auth_stream_req_in {
>>>  	u8
>> 	seq_num_m[HDCP_2_2_SEQ_NUM_LEN];
>>>  	u8				m_prime[HDCP_2_2_MPRIME_LEN];
>>>  	__be16				k;
>>> -	struct hdcp2_streamid_type	streams[];
>>> +	struct hdcp2_streamid_type	streams[1];
>>>  } __packed;
>>>
>>>  struct wired_cmd_repeater_auth_stream_req_out {
>>>