linux-kernel - Re: [char-misc-next] Revert "mei: hdcp: Replace one-element array with flexible-array member"

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Message-ID: <c7359f57-a023-0918-e082-7f17f6c05e6e@embeddedor.com>
Date:   Tue, 28 Jul 2020 17:17:46 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>
Subject: Re: [char-misc-next] Revert "mei: hdcp: Replace one-element array
 with flexible-array member"



On 7/28/20 17:14, Gustavo A. R. Silva wrote:
> 
> 
> On 7/28/20 17:01, Winkler, Tomas wrote:
>>
>>
>>> -----Original Message-----
>>> From: Gustavo A. R. Silva <gustavo@...eddedor.com>
>>> Sent: Wednesday, July 29, 2020 00:57
>>> To: Winkler, Tomas <tomas.winkler@...el.com>; Greg Kroah-Hartman
>>> <gregkh@...uxfoundation.org>
>>> Cc: Usyskin, Alexander <alexander.usyskin@...el.com>; linux-
>>> kernel@...r.kernel.org; Gustavo A . R . Silva <gustavoars@...nel.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@...db.de> (supporter:CHAR and MISC DRIVERS)
> Greg Kroah-Hartman <gregkh@...uxfoundation.org> (supporter:CHAR and MISC DRIVERS)
> linux-kernel@...r.kernel.org (open list)
> $ scripts/get_maintainer.pl --nokeywords --nogit --nogit-fallback drivers/misc/mei/hdcp/mei_hdcp.h
> Arnd Bergmann <arnd@...db.de> (supporter:CHAR and MISC DRIVERS)
> Greg Kroah-Hartman <gregkh@...uxfoundation.org> (supporter:CHAR and MISC DRIVERS)
> linux-kernel@...r.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?>

Notice that if I run this command:

$ scripts/get_maintainer.pl -f drivers/misc/mei/hdcp/mei_hdcp.h
Arnd Bergmann <arnd@...db.de> (supporter:CHAR and MISC DRIVERS)
Greg Kroah-Hartman <gregkh@...uxfoundation.org> (supporter:CHAR and MISC DRIVERS)
Ramalingam C <ramalingam.c@...el.com> (commit_signer:2/2=100%,authored:2/2=100%,added_lines:4/4=100%,removed_lines:13/13=100%)
Tomas Winkler <tomas.winkler@...el.com> (commit_signer:2/2=100%)
Uma Shankar <uma.shankar@...el.com> (commit_signer:2/2=100%)
Jani Nikula <jani.nikula@...el.com> (commit_signer:2/2=100%)
Shashank Sharma <shashank.sharma@...el.com> (commit_signer:2/2=100%)
linux-kernel@...r.kernel.org (open list)

You appear this time, but not as a maintainer.

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@...nel.org>
>>>> Signed-off-by: Tomas Winkler <tomas.winkler@...el.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 {
>>>>