linux-kernel - [PATCH] dmaengine: plx_dma: add a missing put

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Date:   Tue, 23 Mar 2021 16:19:59 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] dmaengine: plx_dma: add a missing put_device() on error path

Add a missing put_device(&pdev->dev) if the call to
dma_async_device_register(dma); fails.

Fixes: 905ca51e63be ("dmaengine: plx-dma: Introduce PLX DMA engine PCI driver skeleton")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/dma/plx_dma.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/plx_dma.c b/drivers/dma/plx_dma.c
index f387c5bbc170..166934544161 100644
--- a/drivers/dma/plx_dma.c
+++ b/drivers/dma/plx_dma.c
@@ -507,10 +507,8 @@ static int plx_dma_create(struct pci_dev *pdev)
 
 	rc = request_irq(pci_irq_vector(pdev, 0), plx_dma_isr, 0,
 			 KBUILD_MODNAME, plxdev);
-	if (rc) {
-		kfree(plxdev);
-		return rc;
-	}
+	if (rc)
+		goto free_plx;
 
 	spin_lock_init(&plxdev->ring_lock);
 	tasklet_setup(&plxdev->desc_task, plx_dma_desc_task);
@@ -540,14 +538,20 @@ static int plx_dma_create(struct pci_dev *pdev)
 	rc = dma_async_device_register(dma);
 	if (rc) {
 		pci_err(pdev, "Failed to register dma device: %d\n", rc);
-		free_irq(pci_irq_vector(pdev, 0),  plxdev);
-		kfree(plxdev);
-		return rc;
+		goto put_device;
 	}
 
 	pci_set_drvdata(pdev, plxdev);
 
 	return 0;
+
+put_device:
+	put_device(&pdev->dev);
+	free_irq(pci_irq_vector(pdev, 0),  plxdev);
+free_plx:
+	kfree(plxdev);
+
+	return rc;
 }
 
 static int plx_dma_probe(struct pci_dev *pdev,
-- 
2.30.2