The call to of_parse_phandle() returns a node pointer with refcount
incremented thus it must be explicitly decremented here after the last
usage.
The of_find_device_by_node() takes a reference to the underlying device
structure, we also should release that reference.
Hans Verkuil says:
The cec driver should never take a reference of the hdmi device.
It never accesses the HDMI device, it only needs the HDMI device pointer as
a key in the notifier list.
The real problem is that several CEC drivers take a reference of the HDMI
device and never release it. So those drivers need to be fixed.
This patch fixes those two issues.
Fixes: fc4e009c6c98 ("[media] stih-cec: add CEC notifier support")
Suggested-by: Hans Verkuil (hansverk) <hansv...@cisco.com>
Signed-off-by: Wen Yang <wen.yan...@zte.com.cn>
Cc: Hans Verkuil (hansverk) <hansv...@cisco.com>
Cc: Benjamin Gaignard <benjamin.gaign...@linaro.org>
Cc: Mauro Carvalho Chehab <mche...@kernel.org>
Cc: Wen Yang <yellowriver2...@hotmail.com>
Cc: linux-media@vger.kernel.org
---
v2->v1:
- move of_node_put() to just after the 'hdmi_dev = of_find_device_by_node(np)'.
- put_device() can be done before the cec = devm_kzalloc line.
drivers/media/platform/sti/cec/stih-cec.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/media/platform/sti/cec/stih-cec.c
b/drivers/media/platform/sti/cec/stih-cec.c
index d34099f..721021f 100644
--- a/drivers/media/platform/sti/cec/stih-cec.c
+++ b/drivers/media/platform/sti/cec/stih-cec.c
@@ -317,9 +317,11 @@ static int stih_cec_probe(struct platform_device *pdev)
}
hdmi_dev = of_find_device_by_node(np);
+ of_node_put(np);
if (!hdmi_dev)
return -EPROBE_DEFER;
+ put_device(&hdmi_dev->dev);
cec->notifier = cec_notifier_get(&hdmi_dev->dev);
if (!cec->notifier)
return -ENOMEM;
--
2.9.5
