linux-kernel - [RFT] dmaengine: fsl-qdma: Handle invalid qdma-queue0 IRQ

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Date:   Fri,  4 Oct 2019 17:08:26 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Peng Ma <peng.ma@....com>, Wen He <wen.he_1@....com>,
        Jiaheng Fan <jiaheng.fan@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFT] dmaengine: fsl-qdma: Handle invalid qdma-queue0 IRQ

platform_get_irq_byname() might return -errno which later would be cast
to an unsigned int and used in IRQ handling code leading to usage of
wrong ID and errors about wrong irq_base.

Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

---

Not marking as cc-stable as this was not reproduced and not tested.
---
 drivers/dma/fsl-qdma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c
index 06664fbd2d91..89792083d62c 100644
--- a/drivers/dma/fsl-qdma.c
+++ b/drivers/dma/fsl-qdma.c
@@ -1155,6 +1155,9 @@ static int fsl_qdma_probe(struct platform_device *pdev)
 		return ret;
 
 	fsl_qdma->irq_base = platform_get_irq_byname(pdev, "qdma-queue0");
+	if (fsl_qdma->irq_base < 0)
+		return fsl_qdma->irq_base;
+
 	fsl_qdma->feature = of_property_read_bool(np, "big-endian");
 	INIT_LIST_HEAD(&fsl_qdma->dma_dev.channels);
 
-- 
2.17.1