linux-kernel - Re: [PATCH V2 2/2] firmware: arm_scmi: Skip adding bad duplicates

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Message-ID: <53d929a2-2f54-ac97-3184-861442e8622b@quicinc.com>
Date: Mon, 7 Oct 2024 12:30:14 +0530
From: Sibi Sankar <quic_sibis@...cinc.com>
To: Cristian Marussi <cristian.marussi@....com>
CC: <sudeep.holla@....com>, <linux-kernel@...r.kernel.org>,
        <arm-scmi@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>, <johan@...nel.org>,
        <konradybcio@...nel.org>
Subject: Re: [PATCH V2 2/2] firmware: arm_scmi: Skip adding bad duplicates



On 9/4/24 21:00, Cristian Marussi wrote:
> On Wed, Sep 04, 2024 at 04:21:49PM +0100, Cristian Marussi wrote:
>> On Wed, Sep 04, 2024 at 08:43:24AM +0530, Sibi Sankar wrote:
>>> Ensure that the bad duplicates reported by the platform firmware doesn't
>>> get added to the opp-tables.
>>>
>>
>> Hi Sibi,
>>
>> so if the idea is to make the code more robust when FW sends BAD
>> duplicates, you necessarily need to properly drop opps in opp_count too.
>>
>> One other option would be to just loop with xa_for_each BUT opp_count is
>> used in a number of places...so first of all let's try drop count properly.
>>
>> Can you try this patch down below, instead of your patch.
>> If it solves, I will send a patch (after testing it a bit more :D)
> 
> Hold on... I sent you a diff that does not apply probably on your tree due
> to some uncomitted local work of mine...my bad...let me resend.

Hey Cristian,
Thanks for taking time to send out the diff. I thought this would be
enough but there will still be a disconnect between opp_count and idx
of the opp we populate. Consider a case were we get to have a valid
opp just after duplicate opp. The opp_count will still limit us on what
levels we are allowed to see.

-Sibi

> 
> Thanks,
> Cristian