linux-kernel - [PATCH 5.18 860/879] phy: qcom-qmp: fix reset-controller leak on probe errors

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Date:   Tue,  7 Jun 2022 19:06:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vivek Gautam <vivek.gautam@...eaurora.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 5.18 860/879] phy: qcom-qmp: fix reset-controller leak on probe errors

From: Johan Hovold <johan+linaro@...nel.org>

commit 4d2900f20edfe541f75756a00deeb2ffe7c66bc1 upstream.

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>
Link: https://lore.kernel.org/r/20220427063243.32576-3-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -5818,6 +5818,11 @@ static const struct phy_ops qcom_qmp_pci
 	.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)
@@ -5912,6 +5917,10 @@ int qcom_qmp_phy_create(struct device *d
 			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)