linux-kernel - [PATCH v2 04/11] phy: qcom-qmp-combo: fix memleak on probe deferral

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Message-Id: <20220916102340.11520-5-johan+linaro@kernel.org>
Date:   Fri, 16 Sep 2022 12:23:33 +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 04/11] phy: qcom-qmp-combo: 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.

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-combo.c | 32 ++++++++++++-----------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
index f5d0d290d26e..1d55892c6575 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
@@ -2714,17 +2714,17 @@ static int qmp_combo_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 = devm_of_iomap(dev, np, 2, NULL);
+	if (IS_ERR(qphy->pcs))
+		return PTR_ERR(qphy->pcs);
 
 	if (cfg->pcs_usb_offset)
 		qphy->pcs_usb = qphy->pcs + cfg->pcs_usb_offset;
@@ -2736,9 +2736,9 @@ static int qmp_combo_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");
 
@@ -2748,15 +2748,17 @@ static int qmp_combo_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;
+	}
 
 	/*
 	 * Get PHY's Pipe clock, if any. USB3 and PCIe are PIPE3
-- 
2.35.1