linux-kernel - [PATCH] dmaengine: k3dma: Add missing IRQ check in k3_dma

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Message-Id: <20220128162659.14227-1-linmq006@gmail.com>
Date:   Fri, 28 Jan 2022 16:26:59 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] dmaengine: k3dma: Add missing IRQ check in k3_dma_probe

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

Fixes: 8e6152bc660e ("dmaengine: Add hisilicon k3 DMA engine driver")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/dma/k3dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c
index ecdaada95120..3c2c44efc8f6 100644
--- a/drivers/dma/k3dma.c
+++ b/drivers/dma/k3dma.c
@@ -878,6 +878,8 @@ static int k3_dma_probe(struct platform_device *op)
 	}
 
 	irq = platform_get_irq(op, 0);
+	if (irq < 0)
+		return irq;
 	ret = devm_request_irq(&op->dev, irq,
 			k3_dma_int_handler, 0, DRIVER_NAME, d);
 	if (ret)
-- 
2.17.1