linux-kernel - Re: [PATCH 2/2] phy: qcom-qmp: new qmp phy driver for qcom-chipsets

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Message-ID: <CAFp+6iGehJQOEt=GcE3Psa5N1ynFmvqWgLncFw1n_j6XjJy1Vg@mail.gmail.com>
Date:   Thu, 20 Oct 2016 09:47:13 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     kishon <kishon@...com>, "robh+dt" <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        fengguang.wu@...el.com, kbuild-all@...org, julia.lawall@...6.fr
Subject: Re: [PATCH 2/2] phy: qcom-qmp: new qmp phy driver for qcom-chipsets

On Wed, Oct 19, 2016 at 4:24 PM, Vivek Gautam
<vivek.gautam@...eaurora.org> wrote:
> CC: Srinivas Kandagatla
>
>
> On 10/19/2016 04:13 PM, Vivek Gautam wrote:
>>
>> Qualcomm SOCs have QMP phy controller that provides support
>> to a number of controller, viz. PCIe, UFS, and USB.
>> Add a new driver, based on generic phy framework, for this
>> phy controller.
>>
>> USB3-phy changes: Based on phy-msm-ssusb-qmp driver available on
>> msm-4.4 kernel @codeaurora[1].
>> PCIe-phy changes: Based on msm8996-pcie-phy driver posted by
>> Srinivas [2].
>>
>> [1]
>> https://source.codeaurora.org/quic/la/kernel/msm-4.4/log/?h=caf/3.18/msm-3.18
>> [2] https://patchwork.kernel.org/patch/9318947/
>>
>> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
>> Cc: Kishon Vijay Abraham I <kishon@...com>
>> ---

[snip]

>> +static int qcom_qmp_phy_com_init(struct qcom_qmp_phy *qphy)
>> +{
>> +       const struct qmp_phy_init_cfg *cfg = qphy->cfg;
>> +       void __iomem *serdes = qphy->serdes;
>> +       int ret;
>> +
>> +       mutex_lock(&qphy->phy_mutex);
>> +       if (qphy->init_count++) {
>> +               mutex_unlock(&qphy->phy_mutex);
>> +               return 0;
>> +       }
>> +
>> +       ret = reset_control_deassert(qphy->phy_rst);
>> +       if (ret) {
>> +               dev_err(qphy->dev, "phy reset deassert failed\n");
>> +               return ret;

Pointed out by Kbuild-test: drivers/phy/phy-qcom-qmp.c:677:2-8:
preceding lock on line 668

The mutex has to be unlocked for all error cases.
Will fix this in the next patch version.

[snip]


Thanks
Vivek


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