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From: Liang He <windhl@126.com>
To: narmstrong@baylibre.com, airlied@linux.ie, daniel@ffwll.ch,
	khilman@baylibre.com, jbrunet@baylibre.com,
	martin.blumenstingl@googlemail.com,
	dri-devel@lists.freedesktop.org,
	linux-amlogic@lists.infradead.org, windhl@126.com
Subject: [PATCH] drm/meson: Fix refcount bugs in meson_vpu_has_available_connectors()
Date: Tue, 26 Jul 2022 09:07:22 +0800	[thread overview]
Message-ID: <20220726010722.1319416-1-windhl@126.com> (raw)

In this function, there are two refcount leak bugs:
(1) when breaking out of for_each_endpoint_of_node(), we need call
the of_node_put() for the 'ep';
(2) we should call of_node_put() for the reference returned by
of_graph_get_remote_port() when it is not used anymore.

Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")
Signed-off-by: Liang He <windhl@126.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/gpu/drm/meson/meson_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 1b70938cfd2c..bd4ca11d3ff5 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -115,8 +115,11 @@ static bool meson_vpu_has_available_connectors(struct device *dev)
 	for_each_endpoint_of_node(dev->of_node, ep) {
 		/* If the endpoint node exists, consider it enabled */
 		remote = of_graph_get_remote_port(ep);
-		if (remote)
+		if (remote) {
+			of_node_put(remote);
+			of_node_put(ep);
 			return true;
+		}
 	}
 
 	return false;
-- 
2.25.1


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             reply	other threads:[~2022-07-26  1:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-26  1:07 Liang He [this message]
2022-08-08  7:43 ` Neil Armstrong
2022-08-08  7:52 ` Neil Armstrong

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