linux-kernel - Re: [PATCH v5 3/6] soc: qcom: Make the Qualcomm UFS/SDCC ICE a dedicated driver

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Date:   Thu, 6 Apr 2023 13:34:32 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH v5 3/6] soc: qcom: Make the Qualcomm UFS/SDCC ICE a
 dedicated driver

On Mon, Apr 03, 2023 at 11:05:27PM +0300, Abel Vesa wrote:
> This takes the already existing duplicated support in both ufs-qcom
> and sdhci-msm drivers and makes it a dedicated driver that can be used
> by both mentioned drivers. The reason for this is because, staring with
> SM8550, the ICE IP block is shared between UFS and SDCC, which means we
> need to probe a dedicated device and share it between those two
> consumers. So let's add the ICE dedicated driver as a soc driver.
> Platforms that already have ICE supported, will use it as a library
> as the of_qcom_ice_get will return an ICE instance created for the
> consumer device. This allows the backwards compatibility with old-style
> devicetree approach. Also, add support to HW version 4.x since it
> works out-of-the-box with the current driver. The 4.x HW version is
> found on SM8550 platform.

Can you please split up long paragraphs like this into multiple paragraphs?

> +	pdev = of_find_device_by_node(node);
> +	if (!pdev) {
> +		dev_err(dev, "Cannot find device node %s\n", node->name);
> +		ice = ERR_PTR(-EPROBE_DEFER);
> +		goto out;
> +	}
> +
> +	ice = platform_get_drvdata(pdev);
> +	if (!ice) {
> +		dev_err(dev, "Cannot get ice instance from %s\n",
> +			dev_name(&pdev->dev));
> +		platform_device_put(pdev);
> +		ice = ERR_PTR(-EPROBE_DEFER);
> +		goto out;
> +	}
> +
> +	ice->link = device_link_add(dev, &pdev->dev, DL_FLAG_AUTOREMOVE_SUPPLIER);
> +	if (!ice->link) {
> +		dev_err(&pdev->dev,
> +			"Failed to create device link to consumer %s\n",
> +			dev_name(dev));
> +		ice = ERR_PTR(-EINVAL);
> +	}

Is a call to platform_device_put() missing above?

- Eric