dmaengine: ti: edma: fix OF node reference leaks in edma_driver

[ Upstream commit e883c64 ]

The .probe() of edma_driver calls of_parse_phandle_with_fixed_args() but
does not release the obtained OF nodes. Thus add a of_node_put() call.

This bug was found by an experimental verification tool that I am
developing.

Fixes: 1be5336 ("dmaengine: edma: New device tree binding")
Signed-off-by: Joe Hattori <joe@pf.is.s.u-tokyo.ac.jp>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/20241219020507.1983124-3-joe@pf.is.s.u-tokyo.ac.jp
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/dma/ti/edma.c

@@ -208,7 +208,6 @@ struct edma_desc {
 struct edma_cc;
 
 struct edma_tc {
-	struct device_node		*node;
 	u16				id;
 };
 
@@ -2466,13 +2465,13 @@ static int edma_probe(struct platform_device *pdev)
 			if (ret || i == ecc->num_tc)
 				break;
 
-			ecc->tc_list[i].node = tc_args.np;
 			ecc->tc_list[i].id = i;
 			queue_priority_mapping[i][1] = tc_args.args[0];
 			if (queue_priority_mapping[i][1] > lowest_priority) {
 				lowest_priority = queue_priority_mapping[i][1];
 				info->default_queue = i;
 			}
+			of_node_put(tc_args.np);
 		}
 
 		/* See if we have optional dma-channel-mask array */