linux-kernel - Re: [PATCH V2] cpufreq: scmi: Avoid overflow of target

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Message-ID: <e3a7c295-28e8-465c-824f-6f14c5977726@quicinc.com>
Date: Mon, 27 May 2024 15:26:49 +0530
From: Jagadeesh Kona <quic_jkona@...cinc.com>
To: Viresh Kumar <viresh.kumar@...aro.org>
CC: Sudeep Holla <sudeep.holla@....com>,
        "Rafael J . Wysocki"
	<rafael@...nel.org>,
        Cristian Marussi <cristian.marussi@....com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Taniya Das <quic_tdas@...cinc.com>,
        "Ajit
 Pandey" <quic_ajipan@...cinc.com>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        Vivek Aknurwar <quic_viveka@...cinc.com>,
        Mike Tipton
	<quic_mdtipton@...cinc.com>
Subject: Re: [PATCH V2] cpufreq: scmi: Avoid overflow of target_freq in fast
 switch



On 5/20/2024 2:17 PM, Viresh Kumar wrote:
> On 20-05-24, 12:07, Jagadeesh Kona wrote:
>> Conversion of target_freq to HZ in scmi_cpufreq_fast_switch()
>> can lead to overflow if the multiplied result is greater than
>> UINT_MAX, since type of target_freq is unsigned int. Avoid this
>> overflow by assigning target_freq to unsigned long variable for
>> converting it to HZ.
>>
>> Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>> ---
>> Changes in V2:
>>    - Updated freq variable from u64 to unsigned long to keep it
>>      consistent with the rate parameter in scmi .freq_set() callback
>>    - Link to v1: https://lore.kernel.org/all/20240517070157.19553-1-quic_jkona@quicinc.com/
>> ---
>>   drivers/cpufreq/scmi-cpufreq.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> Applied. Thanks.
> 

Thanks Viresh for the offline update on applying this patch to cpufreq 
arm tree. Please help share the git tree details of the same, since we 
need them to pick this change in Google ACK and downstream tree.

Thanks,
Jagadeesh