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[35.204.162.40]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9e564cc5e4sm525678366b.89.2024.11.04.01.15.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Nov 2024 01:15:14 -0800 (PST) Date: Mon, 4 Nov 2024 09:15:11 +0000 From: Quentin Perret To: Jinjie Ruan Cc: rafael@kernel.org, pavel@ucw.cz, len.brown@intel.com, daniel.lezcano@linaro.org, lukasz.luba@arm.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] PM: EM: Fix uninitialized power in em_create_perf_table Message-ID: References: <20241104090351.1352997-1-ruanjinjie@huawei.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241104090351.1352997-1-ruanjinjie@huawei.com> Hi, On Monday 04 Nov 2024 at 17:03:51 (+0800), Jinjie Ruan wrote: > In em_create_perf_table(), power is uninitialized and passed the pointer > to active_power() hook, but the hook function may not assign it and > return 0, such as mtk_cpufreq_get_cpu_power(), so the later zero check for > power is not invalid, initialize power to zero to fix it. Sounds to me like a driver bug? We check the return value of active_power() first, so if the callback failed it should tell us. mtk_cpufreq_get_cpu_power() should only fail if we couldn't find a cpufreq policy IIUC, so why can't this return -EINVAL instead? Thanks, Quentin