[PATCH 6.1 071/280] dmaengine: lpc18xx-dmamux: fix device leak on route allocation

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@kernel.org>

commit d4d63059dee7e7cae0c4d9a532ed558bc90efb55 upstream.

Make sure to drop the reference taken when looking up the DMA mux
platform device during route allocation.

Note that holding a reference to a device does not prevent its driver
data from going away so there is no point in keeping the reference.

Fixes: e5f4ae84be74 ("dmaengine: add driver for lpc18xx dmamux")
Cc: stable@vger.kernel.org	# 4.3
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Link: https://patch.msgid.link/20251117161258.10679-8-johan@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/dma/lpc18xx-dmamux.c |   19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

--- a/drivers/dma/lpc18xx-dmamux.c
+++ b/drivers/dma/lpc18xx-dmamux.c
@@ -55,30 +55,31 @@ static void *lpc18xx_dmamux_reserve(stru
 	struct lpc18xx_dmamux_data *dmamux = platform_get_drvdata(pdev);
 	unsigned long flags;
 	unsigned mux;
+	int ret = -EINVAL;
 
 	if (dma_spec->args_count != 3) {
 		dev_err(&pdev->dev, "invalid number of dma mux args\n");
-		return ERR_PTR(-EINVAL);
+		goto err_put_pdev;
 	}
 
 	mux = dma_spec->args[0];
 	if (mux >= dmamux->dma_master_requests) {
 		dev_err(&pdev->dev, "invalid mux number: %d\n",
 			dma_spec->args[0]);
-		return ERR_PTR(-EINVAL);
+		goto err_put_pdev;
 	}
 
 	if (dma_spec->args[1] > LPC18XX_DMAMUX_MAX_VAL) {
 		dev_err(&pdev->dev, "invalid dma mux value: %d\n",
 			dma_spec->args[1]);
-		return ERR_PTR(-EINVAL);
+		goto err_put_pdev;
 	}
 
 	/* The of_node_put() will be done in the core for the node */
 	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
 	if (!dma_spec->np) {
 		dev_err(&pdev->dev, "can't get dma master\n");
-		return ERR_PTR(-EINVAL);
+		goto err_put_pdev;
 	}
 
 	spin_lock_irqsave(&dmamux->lock, flags);
@@ -87,7 +88,8 @@ static void *lpc18xx_dmamux_reserve(stru
 		dev_err(&pdev->dev, "dma request %u busy with %u.%u\n",
 			mux, mux, dmamux->muxes[mux].value);
 		of_node_put(dma_spec->np);
-		return ERR_PTR(-EBUSY);
+		ret = -EBUSY;
+		goto err_put_pdev;
 	}
 
 	dmamux->muxes[mux].busy = true;
@@ -104,7 +106,14 @@ static void *lpc18xx_dmamux_reserve(stru
 	dev_dbg(&pdev->dev, "mapping dmamux %u.%u to dma request %u\n", mux,
 		dmamux->muxes[mux].value, mux);
 
+	put_device(&pdev->dev);
+
 	return &dmamux->muxes[mux];
+
+err_put_pdev:
+	put_device(&pdev->dev);
+
+	return ERR_PTR(ret);
 }
 
 static int lpc18xx_dmamux_probe(struct platform_device *pdev)