linux-kernel - [PATCH 5.4 38/38] dmaengine: ti: Add missing put_device in ti_dra7_xbar_route

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Message-Id: <20220711090539.846431997@linuxfoundation.org>
Date:   Mon, 11 Jul 2022 11:07:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 5.4 38/38] dmaengine: ti: Add missing put_device in ti_dra7_xbar_route_allocate

From: Miaoqian Lin <linmq006@...il.com>

commit 615a4bfc426e11dba05c2cf343f9ac752fb381d2 upstream.

of_find_device_by_node() takes reference, we should use put_device()
to release it when not need anymore.

Fixes: a074ae38f859 ("dmaengine: Add driver for TI DMA crossbar on DRA7x")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@...il.com>
Link: https://lore.kernel.org/r/20220605042723.17668-1-linmq006@gmail.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/dma/ti/dma-crossbar.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/dma/ti/dma-crossbar.c
+++ b/drivers/dma/ti/dma-crossbar.c
@@ -247,6 +247,7 @@ static void *ti_dra7_xbar_route_allocate
 	if (dma_spec->args[0] >= xbar->xbar_requests) {
 		dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
 			dma_spec->args[0]);
+		put_device(&pdev->dev);
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -254,12 +255,14 @@ static void *ti_dra7_xbar_route_allocate
 	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");
+		put_device(&pdev->dev);
 		return ERR_PTR(-EINVAL);
 	}
 
 	map = kzalloc(sizeof(*map), GFP_KERNEL);
 	if (!map) {
 		of_node_put(dma_spec->np);
+		put_device(&pdev->dev);
 		return ERR_PTR(-ENOMEM);
 	}
 
@@ -271,6 +274,7 @@ static void *ti_dra7_xbar_route_allocate
 		dev_err(&pdev->dev, "Run out of free DMA requests\n");
 		kfree(map);
 		of_node_put(dma_spec->np);
+		put_device(&pdev->dev);
 		return ERR_PTR(-ENOMEM);
 	}
 	set_bit(map->xbar_out, xbar->dma_inuse);