linux-kernel - [PATCH 5.15.y 2/4] phy: qcom-qmp-combo: fix memleak on probe deferral

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Message-Id: <20230113005405.3992011-3-swboyd@chromium.org>
Date:   Thu, 12 Jan 2023 16:54:03 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     stable@...r.kernel.org
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 5.15.y 2/4] phy: qcom-qmp-combo: fix memleak on probe deferral

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

commit 2de8a325b1084330ae500380cc27edc39f488c30 upstream.

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>
Link: https://lore.kernel.org/r/20220916102340.11520-5-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c | 32 +++++++++++++++--------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 7b7557c35af6..c6f860ce3d99 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -5410,17 +5410,17 @@ int qcom_qmp_phy_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 this is a dual-lane PHY, then there should be registers for the
@@ -5429,9 +5429,9 @@ int qcom_qmp_phy_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");
 
@@ -5441,15 +5441,17 @@ int qcom_qmp_phy_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
-- 
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