linux-kernel - [PATCH 1/5] remoteproc: k3-r5: Add devm action to release reserved memory

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Message-ID: <20241204111130.2218497-2-b-padhi@ti.com>
Date: Wed, 4 Dec 2024 16:41:26 +0530
From: Beleswar Padhi <b-padhi@...com>
To: <andersson@...nel.org>, <mathieu.poirier@...aro.org>
CC: <afd@...com>, <hnagalla@...com>, <u-kumar1@...com>,
        <jan.kiszka@...mens.com>, <christophe.jaillet@...adoo.fr>,
        <b-padhi@...com>, <linux-remoteproc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/5] remoteproc: k3-r5: Add devm action to release reserved memory

Use a device lifecycle managed action to release reserved memory. This
helps prevent mistakes like releasing out of order in cleanup functions
and forgetting to release on error paths.

Signed-off-by: Beleswar Padhi <b-padhi@...com>
---
 drivers/remoteproc/ti_k3_r5_remoteproc.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/remoteproc/ti_k3_r5_remoteproc.c b/drivers/remoteproc/ti_k3_r5_remoteproc.c
index 6560b7954027..d51f88a5abc1 100644
--- a/drivers/remoteproc/ti_k3_r5_remoteproc.c
+++ b/drivers/remoteproc/ti_k3_r5_remoteproc.c
@@ -955,6 +955,13 @@ static int k3_r5_rproc_configure(struct k3_r5_rproc *kproc)
 	return ret;
 }
 
+static void k3_r5_mem_release(void *data)
+{
+	struct device *dev = data;
+
+	of_reserved_mem_device_release(dev);
+}
+
 static int k3_r5_reserved_mem_init(struct k3_r5_rproc *kproc)
 {
 	struct device *dev = kproc->dev;
@@ -985,12 +992,14 @@ static int k3_r5_reserved_mem_init(struct k3_r5_rproc *kproc)
 		return ret;
 	}
 
+	ret = devm_add_action_or_reset(dev, k3_r5_mem_release, dev);
+	if (ret)
+		return ret;
+
 	num_rmems--;
 	kproc->rmem = kcalloc(num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
-	if (!kproc->rmem) {
-		ret = -ENOMEM;
-		goto release_rmem;
-	}
+	if (!kproc->rmem)
+		return -ENOMEM;
 
 	/* use remaining reserved memory regions for static carveouts */
 	for (i = 0; i < num_rmems; i++) {
@@ -1041,8 +1050,6 @@ static int k3_r5_reserved_mem_init(struct k3_r5_rproc *kproc)
 	for (i--; i >= 0; i--)
 		iounmap(kproc->rmem[i].cpu_addr);
 	kfree(kproc->rmem);
-release_rmem:
-	of_reserved_mem_device_release(dev);
 	return ret;
 }
 
@@ -1053,8 +1060,6 @@ static void k3_r5_reserved_mem_exit(struct k3_r5_rproc *kproc)
 	for (i = 0; i < kproc->num_rmems; i++)
 		iounmap(kproc->rmem[i].cpu_addr);
 	kfree(kproc->rmem);
-
-	of_reserved_mem_device_release(kproc->dev);
 }
 
 /*
-- 
2.34.1