[PATCH v5 09/11] drm/bridge: it6505: hold endpoint OF node reference while parsing it

[Daniel Golle <daniel@makrotopia.org>]

it6505_parse_dt() drops the reference to each endpoint node right
after looking it up and then keeps reading its properties, racing
with the node being freed under CONFIG_OF_DYNAMIC. Put the node only
once parsing is done.

Fixes: 380d920b582d ("drm/bridge: add it6505 driver to read data-lanes and link-frequencies from dt")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
v5: new patch

 drivers/gpu/drm/bridge/ite-it6505.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index e9208d827ce3..6f23203d5f2a 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -3364,7 +3364,6 @@ static void it6505_parse_dt(struct it6505 *it6505)
 	}
 
 	ep = of_graph_get_endpoint_by_regs(np, 1, 0);
-	of_node_put(ep);
 
 	if (ep) {
 		len = it6505_get_data_lanes_count(ep, 1, 4);
@@ -3377,13 +3376,13 @@ static void it6505_parse_dt(struct it6505 *it6505)
 			*max_lane_count = MAX_LANE_COUNT;
 			dev_err(dev, "error data-lanes, use default");
 		}
+		of_node_put(ep);
 	} else {
 		*max_lane_count = MAX_LANE_COUNT;
 		dev_err(dev, "error endpoint, use default");
 	}
 
 	ep = of_graph_get_endpoint_by_regs(np, 0, 0);
-	of_node_put(ep);
 
 	if (ep) {
 		len = of_property_read_variable_u64_array(ep,
@@ -3403,6 +3402,7 @@ static void it6505_parse_dt(struct it6505 *it6505)
 			dev_err(dev, "error link frequencies, use default");
 			*max_dpi_pixel_clock = DPI_PIXEL_CLK_MAX;
 		}
+		of_node_put(ep);
 	} else {
 		dev_err(dev, "error endpoint, use default");
 		*max_dpi_pixel_clock = DPI_PIXEL_CLK_MAX;
-- 
2.55.0