linux-kernel - [PATCH -next] dmaengine: ste_dma40: Add missing IRQ check in d40

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Date:   Mon, 24 Jul 2023 14:41:08 +0000
From:   Ruan Jinjie <ruanjinjie@...wei.com>
To:     <linus.walleij@...aro.org>, <vkoul@...nel.org>,
        <akpm@...ux-foundation.org>, <dan.j.williams@...el.com>,
        <srinidhi.kasagar@...ricsson.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <ruanjinjie@...wei.com>
Subject: [PATCH -next] dmaengine: ste_dma40: Add missing IRQ check in d40_probe

From: ruanjinjie <ruanjinjie@...wei.com>

Check for the return value of platform_get_irq(): if no interrupt
is specified, it wouldn't make sense to call request_irq().

Fixes: 8d318a50b3d7 ("DMAENGINE: Support for ST-Ericssons DMA40 block v3")
Signed-off-by: Ruan Jinjie <ruanjinjie@...wei.com>
---
 drivers/dma/ste_dma40.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 825001bde42c..89e82508c133 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -3590,6 +3590,10 @@ static int __init d40_probe(struct platform_device *pdev)
 	spin_lock_init(&base->lcla_pool.lock);
 
 	base->irq = platform_get_irq(pdev, 0);
+	if (base->irq < 0) {
+		ret = base->irq;
+		goto destroy_cache;
+	}
 
 	ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base);
 	if (ret) {
-- 
2.34.1