From: Viresh Kumar <viresh.kumar@linaro.org>
To: "Chun-Jen Tseng (曾俊仁)" <Chun-Jen.Tseng@mediatek.com>
Cc: "cw00.choi@samsung.com" <cw00.choi@samsung.com>,
"rafael@kernel.org" <rafael@kernel.org>,
Project_Global_Chrome_Upstream_Group
<Project_Global_Chrome_Upstream_Group@mediatek.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
"myungjoo.ham@samsung.com" <myungjoo.ham@samsung.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kyungmin.park@samsung.com" <kyungmin.park@samsung.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"matthias.bgg@gmail.com" <matthias.bgg@gmail.com>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>
Subject: Re: [PATCH v3 1/3] cpufreq: mediatek: using global lock avoid race condition
Date: Fri, 21 Mar 2025 11:31:48 +0530 [thread overview]
Message-ID: <20250321060148.adhxjexpnm4dkpnt@vireshk-i7> (raw)
In-Reply-To: <2a73b5ca35692c8ffa68c9ff0df73e24a592967d.camel@mediatek.com>
On 21-03-25, 05:32, Chun-Jen Tseng (曾俊仁) wrote:
> I add a global lock related to the CCI driver.
>
> This is because the CCI needs to obtain the frequencies of policy-0 and
> policy-6 to determine its own frequency.
>
> If policy-0 and policy-6 are set simultaneously, it may cause the CCI
> to select the wrong frequency.
>
> Therefore, I hope to change the setting flow to the following:
> policy-0 or policy-6 -> set frequency -> CCI receives notification -
> set CCI frequency
Can you please point to the code where this race exists ? I am not
sure I fully understand it as of now. If the race is present in
another driver, CCI ?, then shouldn't it be fixed there instead ?
--
viresh
next prev parent reply other threads:[~2025-03-21 6:03 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-14 7:43 [PATCH v3 0/3] fixed mediatek-cpufreq has multi policy concurrency issue Mark Tseng
2025-02-14 7:43 ` [PATCH v3 1/3] cpufreq: mediatek: using global lock avoid race condition Mark Tseng
2025-02-19 5:42 ` Viresh Kumar
2025-03-20 8:22 ` Chun-Jen Tseng (曾俊仁)
2025-03-21 4:56 ` Viresh Kumar
2025-03-21 5:32 ` Chun-Jen Tseng (曾俊仁)
2025-03-21 6:01 ` Viresh Kumar [this message]
2025-03-24 3:21 ` Chun-Jen Tseng (曾俊仁)
2025-03-24 5:43 ` Viresh Kumar
2025-04-14 8:42 ` Chun-Jen Tseng (曾俊仁)
2025-04-16 8:05 ` Viresh Kumar
2025-08-28 13:26 ` Chen-Yu Tsai
2025-08-29 5:47 ` Viresh Kumar
2025-02-19 7:23 ` Dan Carpenter
2025-03-20 8:25 ` Chun-Jen Tseng (曾俊仁)
2025-02-14 7:43 ` [PATCH v3 2/3] cpufreq: mediatek: Add CPUFREQ_ASYNC_NOTIFICATION flag Mark Tseng
2025-02-19 5:45 ` Viresh Kumar
2025-03-20 8:34 ` Chun-Jen Tseng (曾俊仁)
2025-03-21 4:59 ` Viresh Kumar
2025-02-14 7:43 ` [PATCH v3 3/3] cpufreq: mediatek: data safety protect Mark Tseng
2025-02-19 5:49 ` Viresh Kumar
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