linux-kernel - [PATCH 04/15] dmaengine: dw: dmamux: fix OF node leak on route allocation failure

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Message-ID: <20251117161258.10679-6-johan@kernel.org>
Date: Mon, 17 Nov 2025 17:12:47 +0100
From: Johan Hovold <johan@...nel.org>
To: Vinod Koul <vkoul@...nel.org>
Cc: Ludovic Desroches <ludovic.desroches@...rochip.com>,
	Viresh Kumar <vireshk@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Vladimir Zapolskiy <vz@...ia.com>,
	Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>,
	Amélie Delaunay <amelie.delaunay@...s.st.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Peter Ujfalusi <peter.ujfalusi@...il.com>,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan@...nel.org>,
	stable@...r.kernel.org,
	Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH 04/15] dmaengine: dw: dmamux: fix OF node leak on route allocation failure

Make sure to drop the reference taken to the DMA master OF node also on
late route allocation failures.

Fixes: 134d9c52fca2 ("dmaengine: dw: dmamux: Introduce RZN1 DMA router support")
Cc: stable@...r.kernel.org	# 5.19
Cc: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/dma/dw/rzn1-dmamux.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dw/rzn1-dmamux.c b/drivers/dma/dw/rzn1-dmamux.c
index deadf135681b..cbec277af4dd 100644
--- a/drivers/dma/dw/rzn1-dmamux.c
+++ b/drivers/dma/dw/rzn1-dmamux.c
@@ -90,7 +90,7 @@ static void *rzn1_dmamux_route_allocate(struct of_phandle_args *dma_spec,
 
 	if (test_and_set_bit(map->req_idx, dmamux->used_chans)) {
 		ret = -EBUSY;
-		goto free_map;
+		goto put_dma_spec_np;
 	}
 
 	mask = BIT(map->req_idx);
@@ -103,6 +103,8 @@ static void *rzn1_dmamux_route_allocate(struct of_phandle_args *dma_spec,
 
 clear_bitmap:
 	clear_bit(map->req_idx, dmamux->used_chans);
+put_dma_spec_np:
+	of_node_put(dma_spec->np);
 free_map:
 	kfree(map);
 put_device:
-- 
2.51.0