linux-kernel - [PATCH] dmaengine: owl-dma: Add missing IRQ check in owl_dma

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Date:   Fri, 28 Jan 2022 16:37:27 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        Manivannan Sadhasivam <mani@...nel.org>,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] dmaengine: owl-dma: Add missing IRQ check in owl_dma_probe

This func misses checking for platform_get_irq()'s call and may passes the
negative error codes to request_threaded_irq(), which takes unsigned IRQ #,
causing it to fail with -EINVAL, overriding an original error code.
Stop calling request_threaded_irq() with invalid IRQ #s.

Fixes: 47e20577c24d ("dmaengine: Add Actions Semi Owl family S900 DMA driver")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/dma/owl-dma.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma/owl-dma.c b/drivers/dma/owl-dma.c
index 1f0bbaed4643..09cdaecee635 100644
--- a/drivers/dma/owl-dma.c
+++ b/drivers/dma/owl-dma.c
@@ -1160,6 +1160,11 @@ static int owl_dma_probe(struct platform_device *pdev)
 	 * simplification.
 	 */
 	od->irq = platform_get_irq(pdev, 0);
+	if (od->irq < 0) {
+		dev_err(&pdev->dev, "unable to get IRQ\n");
+		return od->irq;
+	}
+
 	ret = devm_request_irq(&pdev->dev, od->irq, owl_dma_interrupt, 0,
 			       dev_name(&pdev->dev), od);
 	if (ret) {
-- 
2.17.1