linux-kernel - [PATCH] usb: gadget: fsl: Fix a wrong judgment in fsl_udc

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Date:   Fri, 10 Apr 2020 09:58:32 +0800
From:   Tang Bin <tangbin@...s.chinamobile.com>
To:     leoyang.li@....com, balbi@...nel.org, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Markus.Elfring@....de,
        Tang Bin <tangbin@...s.chinamobile.com>,
        Shengju Zhang <zhangshengju@...s.chinamobile.com>
Subject: [PATCH] usb: gadget: fsl: Fix a wrong judgment in fsl_udc_probe()

If the function "platform_get_irq()" failed, the negative value
returned will not be detected here, including "-EPROBE_DEFER", which
causes the application to fail to get the correct error message.
Thus it must be fixed.

Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
Signed-off-by: Shengju Zhang <zhangshengju@...s.chinamobile.com>
---
 drivers/usb/gadget/udc/fsl_udc_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/fsl_udc_core.c b/drivers/usb/gadget/udc/fsl_udc_core.c
index ec6eda426..60853ad10 100644
--- a/drivers/usb/gadget/udc/fsl_udc_core.c
+++ b/drivers/usb/gadget/udc/fsl_udc_core.c
@@ -2441,8 +2441,8 @@ static int fsl_udc_probe(struct platform_device *pdev)
 	udc_controller->max_ep = (dccparams & DCCPARAMS_DEN_MASK) * 2;
 
 	udc_controller->irq = platform_get_irq(pdev, 0);
-	if (!udc_controller->irq) {
-		ret = -ENODEV;
+	if (udc_controller->irq <= 0) {
+		ret = udc_controller->irq ? : -ENODEV;
 		goto err_iounmap;
 	}
 
-- 
2.20.1.windows.1