linux-kernel - Re: [PATCH v1] pci: qcom: Fix 'opp' variable usage

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Message-ID: <20240709070915.GA7865@thinkpad>
Date: Tue, 9 Jul 2024 12:39:15 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Varadarajan Narayanan <quic_varada@...cinc.com>
Cc: lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
	bhelgaas@...gle.com, quic_krichai@...cinc.com,
	linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] pci: qcom: Fix 'opp' variable usage

On Tue, Jul 09, 2024 at 12:06:20PM +0530, Varadarajan Narayanan wrote:
> qcom_pcie_icc_opp_update() calls 'dev_pm_opp_put(opp)' regardless
> of the success of dev_pm_opp_find_freq_exact().
> 
> If dev_pm_opp_find_freq_exact() had failed and 'opp' had some
> error value, the subsequent dev_pm_opp_put(opp) results in a
> crash. Hence call dev_pm_opp_put(opp) only if 'opp' has a valid
> value.
> 
> Fixes: 78b5f6f8855e ("PCI: qcom: Add OPP support to scale performance")
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>

Fix was already submitted: https://lore.kernel.org/linux-pci/20240708180539.1447307-3-dan.carpenter@linaro.org/

- Mani

> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 26405fcfa499..2a80d4499c25 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1443,8 +1443,8 @@ static void qcom_pcie_icc_opp_update(struct qcom_pcie *pcie)
>  			if (ret)
>  				dev_err(pci->dev, "Failed to set OPP for freq (%lu): %d\n",
>  					freq_kbps * width, ret);
> +			dev_pm_opp_put(opp);
>  		}
> -		dev_pm_opp_put(opp);
>  	}
>  }
>  
> -- 
> 2.34.1
> 

-- 
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