linux-kernel - [PATCH 1/1] usb: return error code when platform_get

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Message-Id: <1480424255-25059-1-git-send-email-bianpan2016@163.com>
Date:   Tue, 29 Nov 2016 20:57:35 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/1] usb: return error code when platform_get_irq fails

In function xhci_mtk_probe(), variable ret takes the return value. Its
value should be negative on failures. However, when the call to function
platform_get_irq() fails, it does not set the error code, and 0 will be
returned. 0 indicates no error. As a result, the callers of function
xhci_mtk_probe() will not be able to detect the error. This patch fixes
the bug by assigning the return value of platform_get_irq() to variable
ret if it fails.

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/usb/host/xhci-mtk.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 79959f1..f2365a4 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -560,8 +560,10 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 		goto disable_ldos;

 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
+	if (irq < 0) {
+		ret = irq;
 		goto disable_clk;
+	}

 	/* Initialize dma_mask and coherent_dma_mask to 32-bits */
 	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
-- 
1.9.1