[PATCH 5.10 427/452] phy: qcom-qmp: fix reset-controller leak on probe errors

[Greg Kroah-Hartman]

From: Johan Hovold <johan+linaro@xxxxxxxxxx>

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@xxxxxxxxxxxxxxx      # 4.12
Cc: Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx>
Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220427063243.32576-3-johan+linaro@xxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 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
@@ -3717,6 +3717,11 @@ 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)
@@ -3811,6 +3816,10 @@ 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)