linux-kernel - Re: [PATCH v2 2/3] phy: qcom-qmp: fix reset-controller leak on probe errors

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Message-ID: <Ym/Wtqjpdgaaf2tp@ripper>
Date:   Mon, 2 May 2022 06:03:50 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, Andy Gross <agross@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>
Subject: Re: [PATCH v2 2/3] phy: qcom-qmp: fix reset-controller leak on probe
 errors

On Tue 26 Apr 23:32 PDT 2022, Johan Hovold wrote:

> Make sure to release the lane reset controller in case of a late probe
> error (e.g. probe deferral).
> 
> Note that due to the reset controller being defined in devicetree in
> "lane" child nodes, devm_reset_control_get_exclusive() cannot be used
> directly.
> 
> Fixes: e78f3d15e115 ("phy: qcom-qmp: new qmp phy driver for qcom-chipsets")
> Cc: stable@...r.kernel.org      # 4.12
> Cc: Vivek Gautam <vivek.gautam@...eaurora.org>
> Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/phy/qualcomm/phy-qcom-qmp.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index a84f7d1fc9b7..3f77830921f5 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -6005,6 +6005,11 @@ static const struct phy_ops qcom_qmp_pcie_ufs_ops = {
>  	.owner		= THIS_MODULE,
>  };
>  
> +static void qcom_qmp_reset_control_put(void *data)
> +{
> +	reset_control_put(data);
> +}
> +
>  static
>  int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id,
>  			void __iomem *serdes, const struct qmp_phy_cfg *cfg)
> @@ -6099,6 +6104,10 @@ int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id,
>  			dev_err(dev, "failed to get lane%d reset\n", id);
>  			return PTR_ERR(qphy->lane_rst);
>  		}
> +		ret = devm_add_action_or_reset(dev, qcom_qmp_reset_control_put,
> +					       qphy->lane_rst);
> +		if (ret)
> +			return ret;
>  	}
>  
>  	if (cfg->type == PHY_TYPE_UFS || cfg->type == PHY_TYPE_PCIE)
> -- 
> 2.35.1
>