Add the missing of_dma_controller_free() to free the resources allocated
via of_dma_controller_register() during probe(). The missing free was
introduced long time ago  by commit 23e118113782 ("dma: imx-sdma: use
module_platform_driver for SDMA driver") while adding a proper .remove()
implementation.

Use the driver remove() callback to make it possible to backport this
commit.

Fixes: 23e118113782 ("dma: imx-sdma: use module_platform_driver for SDMA driver")
Signed-off-by: Marco Felsch <redacted>
---
 drivers/dma/imx-sdma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 02a85d6f1bea2df7d355858094c0c0b0bd07148e..3ecb917214b1268b148a29df697b780bc462afa4 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c

@@ -2418,6 +2418,7 @@ static void sdma_remove(struct platform_device *pdev)
 	struct sdma_engine *sdma = platform_get_drvdata(pdev);
 	int i;
 
+	of_dma_controller_free(sdma->dev->of_node);
 	devm_free_irq(&pdev->dev, sdma->irq, sdma);
 	dma_async_device_unregister(&sdma->dma_device);
 	kfree(sdma->script_addrs);

-- 
2.47.3