linux-kernel - Re: [PATCH] perf: arm_cspmu: Fix compiler warning

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Date:   Thu, 2 Mar 2023 12:01:52 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Besar Wicaksono <bwicaksono@...dia.com>, catalin.marinas@....com,
        will@...nel.org, mark.rutland@....com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, treding@...dia.com,
        jonathanh@...dia.com, vsethi@...dia.com
Subject: Re: [PATCH] perf: arm_cspmu: Fix compiler warning

On 01/03/2023 22:56, Besar Wicaksono wrote:
> Fix following compiler warning message
>    | smatch warnings:
>    | drivers/perf/arm_cspmu/arm_cspmu.c:1075 arm_cspmu_find_cpu_container()
>    |    warn: variable dereferenced before check 'cpu_dev' (see line 1073)
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <error27@...il.com>
> Link: https://lore.kernel.org/r/202302191227.kc0V8fM7-lkp@intel.com/
> Signed-off-by: Besar Wicaksono <bwicaksono@...dia.com>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>

> ---
>   drivers/perf/arm_cspmu/arm_cspmu.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
> index e31302ab7e37..a3f1c410b417 100644
> --- a/drivers/perf/arm_cspmu/arm_cspmu.c
> +++ b/drivers/perf/arm_cspmu/arm_cspmu.c
> @@ -1078,12 +1078,14 @@ static int arm_cspmu_request_irq(struct arm_cspmu *cspmu)
>   static inline int arm_cspmu_find_cpu_container(int cpu, u32 container_uid)
>   {
>   	u32 acpi_uid;
> -	struct device *cpu_dev = get_cpu_device(cpu);
> -	struct acpi_device *acpi_dev = ACPI_COMPANION(cpu_dev);
> +	struct device *cpu_dev;
> +	struct acpi_device *acpi_dev;
>   
> +	cpu_dev = get_cpu_device(cpu);
>   	if (!cpu_dev)
>   		return -ENODEV;
>   
> +	acpi_dev = ACPI_COMPANION(cpu_dev);
>   	while (acpi_dev) {
>   		if (!strcmp(acpi_device_hid(acpi_dev),
>   			    ACPI_PROCESSOR_CONTAINER_HID) &&
> 
> base-commit: 7f7a8831520f12a3cf894b0627641fad33971221