linux-kernel - [PATCH v2 06/11] phy: qcom-qmp-usb: fix memleak on probe deferral

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Date:   Fri, 16 Sep 2022 12:23:35 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH v2 06/11] phy: qcom-qmp-usb: fix memleak on probe deferral

Switch to using the device-managed of_iomap helper to avoid leaking
memory on probe deferral and driver unbind.

Note that this helper checks for already reserved regions and may fail
if there are multiple devices claiming the same memory.

Two bindings currently rely on overlapping mappings for the PCS region
so fallback to non-exclusive mappings for those for now.

Fixes: e78f3d15e115 ("phy: qcom-qmp: new qmp phy driver for qcom-chipsets")
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-usb.c | 57 ++++++++++++++++++-------
 1 file changed, 42 insertions(+), 15 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
index 41635c21e3ca..41513cef3d99 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
@@ -2606,6 +2606,21 @@ static const struct phy_ops qmp_usb_ops = {
 	.owner		= THIS_MODULE,
 };
 
+static void __iomem *qmp_usb_iomap(struct device *dev, struct device_node *np,
+					int index, bool exclusive)
+{
+	struct resource res;
+
+	if (!exclusive) {
+		if (of_address_to_resource(np, index, &res))
+			return IOMEM_ERR_PTR(-EINVAL);
+
+		return devm_ioremap(dev, res.start, resource_size(&res));
+	}
+
+	return devm_of_iomap(dev, np, index, NULL);
+}
+
 static
 int qmp_usb_create(struct device *dev, struct device_node *np, int id,
 			void __iomem *serdes, const struct qmp_phy_cfg *cfg)
@@ -2613,8 +2628,18 @@ int qmp_usb_create(struct device *dev, struct device_node *np, int id,
 	struct qcom_qmp *qmp = dev_get_drvdata(dev);
 	struct phy *generic_phy;
 	struct qmp_phy *qphy;
+	bool exclusive = true;
 	int ret;
 
+	/*
+	 * FIXME: These bindings should be fixed to not rely on overlapping
+	 *        mappings for PCS.
+	 */
+	if (of_device_is_compatible(dev->of_node, "qcom,sdx65-qmp-usb3-uni-phy"))
+		exclusive = false;
+	if (of_device_is_compatible(dev->of_node, "qcom,sm8350-qmp-usb3-uni-phy"))
+		exclusive = false;
+
 	qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
 	if (!qphy)
 		return -ENOMEM;
@@ -2627,17 +2652,17 @@ int qmp_usb_create(struct device *dev, struct device_node *np, int id,
 	 * For dual lane PHYs: tx2 -> 3, rx2 -> 4, pcs_misc (optional) -> 5
 	 * For single lane PHYs: pcs_misc (optional) -> 3.
 	 */
-	qphy->tx = of_iomap(np, 0);
-	if (!qphy->tx)
-		return -ENOMEM;
+	qphy->tx = devm_of_iomap(dev, np, 0, NULL);
+	if (IS_ERR(qphy->tx))
+		return PTR_ERR(qphy->tx);
 
-	qphy->rx = of_iomap(np, 1);
-	if (!qphy->rx)
-		return -ENOMEM;
+	qphy->rx = devm_of_iomap(dev, np, 1, NULL);
+	if (IS_ERR(qphy->rx))
+		return PTR_ERR(qphy->rx);
 
-	qphy->pcs = of_iomap(np, 2);
-	if (!qphy->pcs)
-		return -ENOMEM;
+	qphy->pcs = qmp_usb_iomap(dev, np, 2, exclusive);
+	if (IS_ERR(qphy->pcs))
+		return PTR_ERR(qphy->pcs);
 
 	if (cfg->pcs_usb_offset)
 		qphy->pcs_usb = qphy->pcs + cfg->pcs_usb_offset;
@@ -2649,9 +2674,9 @@ int qmp_usb_create(struct device *dev, struct device_node *np, int id,
 	 * offset from the first lane.
 	 */
 	if (cfg->is_dual_lane_phy) {
-		qphy->tx2 = of_iomap(np, 3);
-		qphy->rx2 = of_iomap(np, 4);
-		if (!qphy->tx2 || !qphy->rx2) {
+		qphy->tx2 = devm_of_iomap(dev, np, 3, NULL);
+		qphy->rx2 = devm_of_iomap(dev, np, 4, NULL);
+		if (IS_ERR(qphy->tx2) || IS_ERR(qphy->rx2)) {
 			dev_warn(dev,
 				 "Underspecified device tree, falling back to legacy register regions\n");
 
@@ -2661,15 +2686,17 @@ int qmp_usb_create(struct device *dev, struct device_node *np, int id,
 			qphy->rx2 = qphy->rx + QMP_PHY_LEGACY_LANE_STRIDE;
 
 		} else {
-			qphy->pcs_misc = of_iomap(np, 5);
+			qphy->pcs_misc = devm_of_iomap(dev, np, 5, NULL);
 		}
 
 	} else {
-		qphy->pcs_misc = of_iomap(np, 3);
+		qphy->pcs_misc = devm_of_iomap(dev, np, 3, NULL);
 	}
 
-	if (!qphy->pcs_misc)
+	if (IS_ERR(qphy->pcs_misc)) {
 		dev_vdbg(dev, "PHY pcs_misc-reg not used\n");
+		qphy->pcs_misc = NULL;
+	}
 
 	qphy->pipe_clk = devm_get_clk_from_child(dev, np, NULL);
 	if (IS_ERR(qphy->pipe_clk)) {
-- 
2.35.1