Re: [PATCH v2 3/4] venus: hfi: add checks to handle capabilities from firmware

[Vikash Garodia]

On 8/11/2023 4:09 PM, Bryan O'Donoghue wrote:
> On 11/08/2023 09:51, Vikash Garodia wrote:
>>
>> On 8/11/2023 2:11 PM, Bryan O'Donoghue wrote:
>>> On 11/08/2023 06:54, Vikash Garodia wrote:
>>>> The case is all about rogue firmware. If there is a need to fill the same cap
>>>> again, that itself indicates that the payload from firmware is not correct. In
>>>> such cases, the old as well as new cap data are not reliable. Though the
>>>> authenticity of the data cannot be ensured, the check would avoid any OOB
>>>> during
>>>> such rogue firmware case.
>>>
>>> Then why favour the old cap report over the new ?
>>
>> When the driver hits the case for OOB, thats when it knows that something has
>> gone wrong. Keeping old or new, both are invalid values in such case, nothing to
>> favor any value.
>>
>> Regards,
>> Vikash
> 
> Is this hypothetical or a real bug you are actually working to mitigate ?

These are theoretical bugs, not reported during any video usecase so far. At the
same time, these are quite possible when the packets from firmware goes
different than expected.

> ---
> bod