Le mer. 13 févr. 2019 à 00:49, Wen Yang <wen.yang99@xxxxxxxxxx> a écrit :
>
> 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.
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
>
> Fixes: fc4e009c6c98 ("[media] stih-cec: add CEC notifier support")
> Suggested-by: Hans Verkuil (hansverk) <hansverk@xxxxxxxxx>
> Signed-off-by: Wen Yang <wen.yang99@xxxxxxxxxx>
> Cc: Hans Verkuil (hansverk) <hansverk@xxxxxxxxx>
> Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> Cc: Wen Yang <yellowriver2010@xxxxxxxxxxx>
> Cc: linux-media@xxxxxxxxxxxxxxx
> ---
> 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
>
