[PATCH] gpu: ipu-v3: common: Add of_node_put() for reference returned by of_graph_get_port_by_id()

[Liang He]

In ipu_add_client_devices(), we need to call of_node_put() for
reference returned by of_graph_get_port_by_id() in fail path.

Fixes: 17e052175039 ("gpu: ipu-v3: Do not bail out on missing optional port nodes")
Signed-off-by: Liang He <windhl at 126.com>
---
In fact, there may be another problem in following code:
 'reg->pdata.of_node = of_node;'
 'ret = platform_device_add_data(pdev, &reg->pdata,
		       sizeof(reg->pdata));'
The prolbem is that the 'of_node' will first escape into 
global 'reg (i.e., client_reg)' and then 'kmemdup' into 
'pdev->dev.platform_data', so there are totally two copies 
of the reference 'of_node'. 
I do not know if there is any problems as I do not know the 
whole picture of 'platform_device_*'.

As a result, I can only give a fix, adding the of_node_put().

 drivers/gpu/ipu-v3/ipu-common.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index 118318513e2d..c35eac1116f5 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -1165,6 +1165,7 @@ static int ipu_add_client_devices(struct ipu_soc *ipu, unsigned long ipu_base)
 		pdev = platform_device_alloc(reg->name, id++);
 		if (!pdev) {
 			ret = -ENOMEM;
+			of_node_put(of_node);
 			goto err_register;
 		}
 
-- 
2.25.1