linux-kernel - [PATCH v2 2/3] remoteproc: da8xx: Use devm action to release reserved memory

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Message-ID: <20241202212938.219964-2-afd@ti.com>
Date: Mon, 2 Dec 2024 15:29:37 -0600
From: Andrew Davis <afd@...com>
To: Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier
	<mathieu.poirier@...aro.org>
CC: <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Andrew
 Davis <afd@...com>
Subject: [PATCH v2 2/3] remoteproc: da8xx: Use devm action to release reserved memory

This helps prevent mistakes like freeing out of order in cleanup functions
and forgetting to free on error paths.

Signed-off-by: Andrew Davis <afd@...com>
---

Changes for v2:
 - Fix unused var "dev" warning

 drivers/remoteproc/da8xx_remoteproc.c | 30 +++++++++++++--------------
 1 file changed, 14 insertions(+), 16 deletions(-)

diff --git a/drivers/remoteproc/da8xx_remoteproc.c b/drivers/remoteproc/da8xx_remoteproc.c
index 47df21bea5254..58b4f05283d92 100644
--- a/drivers/remoteproc/da8xx_remoteproc.c
+++ b/drivers/remoteproc/da8xx_remoteproc.c
@@ -233,6 +233,13 @@ static int da8xx_rproc_get_internal_memories(struct platform_device *pdev,
 	return 0;
 }
 
+static void da8xx_rproc_mem_release(void *data)
+{
+	struct device *dev = data;
+
+	of_reserved_mem_device_release(dev);
+}
+
 static int da8xx_rproc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -274,14 +281,13 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
 		ret = of_reserved_mem_device_init(dev);
 		if (ret)
 			return dev_err_probe(dev, ret, "device does not have specific CMA pool\n");
+		devm_add_action_or_reset(&pdev->dev, da8xx_rproc_mem_release, &pdev->dev);
 	}
 
 	rproc = devm_rproc_alloc(dev, "dsp", &da8xx_rproc_ops, da8xx_fw_name,
 				 sizeof(*drproc));
-	if (!rproc) {
-		ret = -ENOMEM;
-		goto free_mem;
-	}
+	if (!rproc)
+		return -ENOMEM;
 
 	/* error recovery is not supported at present */
 	rproc->recovery_disabled = true;
@@ -294,7 +300,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
 
 	ret = da8xx_rproc_get_internal_memories(pdev, drproc);
 	if (ret)
-		goto free_mem;
+		return ret;
 
 	platform_set_drvdata(pdev, rproc);
 
@@ -304,7 +310,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
 					rproc);
 	if (ret) {
 		dev_err(dev, "devm_request_threaded_irq error: %d\n", ret);
-		goto free_mem;
+		return ret;
 	}
 
 	/*
@@ -314,7 +320,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
 	 */
 	ret = reset_control_assert(dsp_reset);
 	if (ret)
-		goto free_mem;
+		return ret;
 
 	drproc->chipsig = chipsig;
 	drproc->bootreg = bootreg;
@@ -325,22 +331,16 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
 	ret = rproc_add(rproc);
 	if (ret) {
 		dev_err(dev, "rproc_add failed: %d\n", ret);
-		goto free_mem;
+		return ret;
 	}
 
 	return 0;
-
-free_mem:
-	if (dev->of_node)
-		of_reserved_mem_device_release(dev);
-	return ret;
 }
 
 static void da8xx_rproc_remove(struct platform_device *pdev)
 {
 	struct rproc *rproc = platform_get_drvdata(pdev);
 	struct da8xx_rproc *drproc = rproc->priv;
-	struct device *dev = &pdev->dev;
 
 	/*
 	 * The devm subsystem might end up releasing things before
@@ -350,8 +350,6 @@ static void da8xx_rproc_remove(struct platform_device *pdev)
 	disable_irq(drproc->irq);
 
 	rproc_del(rproc);
-	if (dev->of_node)
-		of_reserved_mem_device_release(dev);
 }
 
 static const struct of_device_id davinci_rproc_of_match[] __maybe_unused = {
-- 
2.39.2