linux-kernel - [PATCH v2 02/15] auxdisplay: linedisp: Free allocated resources in ->release()

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Message-ID: <20240212170423.2860895-3-andriy.shevchenko@linux.intel.com>
Date: Mon, 12 Feb 2024 19:01:35 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Andy Shevchenko <andy@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Robin van der Gracht <robin@...tonic.nl>,
	Paul Burton <paulburton@...nel.org>
Subject: [PATCH v2 02/15] auxdisplay: linedisp: Free allocated resources in ->release()

While there is no issue currently with the resources allocation,
the code may still be made more robust by deallocating message
in the ->release() callback.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/auxdisplay/line-display.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/auxdisplay/line-display.c b/drivers/auxdisplay/line-display.c
index 03e7f104aa1a..310e9bfb41ae 100644
--- a/drivers/auxdisplay/line-display.c
+++ b/drivers/auxdisplay/line-display.c
@@ -188,8 +188,16 @@ static struct attribute *linedisp_attrs[] = {
 };
 ATTRIBUTE_GROUPS(linedisp);
 
+static void linedisp_release(struct device *dev)
+{
+	struct linedisp *linedisp = container_of(dev, struct linedisp, dev);
+
+	kfree(linedisp->message);
+}
+
 static const struct device_type linedisp_type = {
 	.groups	= linedisp_groups,
+	.release = linedisp_release,
 };
 
 /**
@@ -253,7 +261,6 @@ void linedisp_unregister(struct linedisp *linedisp)
 {
 	device_del(&linedisp->dev);
 	del_timer_sync(&linedisp->timer);
-	kfree(linedisp->message);
 	put_device(&linedisp->dev);
 }
 EXPORT_SYMBOL_GPL(linedisp_unregister);
-- 
2.43.0.rc1.1.gbec44491f096