Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Sergey Shtylyov <s.shtylyov@omp.ru>,
        Felipe Balbi <balbi@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 088/144] usb: gadget: udc: at91: add IRQ check
Date:   Mon, 13 Sep 2021 15:14:29 +0200
Message-Id: <20210913131050.896025216@linuxfoundation.org>
In-Reply-To: <20210913131047.974309396@linuxfoundation.org>
References: <20210913131047.974309396@linuxfoundation.org>
User-Agent: quilt/0.66
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Sergey Shtylyov <s.shtylyov@omp.ru>

[ Upstream commit 50855c31573b02963f0aa2aacfd4ea41c31ae0e0 ]

The driver neglects to check the result of platform_get_irq()'s call and
blithely 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 the invalid IRQ #s.

Fixes: 8b2e76687b39 ("USB: AT91 UDC updates, mostly power management")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Acked-by: Felipe Balbi <balbi@kernel.org>
Link: https://lore.kernel.org/r/6654a224-739a-1a80-12f0-76d920f87b6c@omp.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/gadget/udc/at91_udc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/at91_udc.c b/drivers/usb/gadget/udc/at91_udc.c
index 194ffb1ed462..d7714c94b119 100644
--- a/drivers/usb/gadget/udc/at91_udc.c
+++ b/drivers/usb/gadget/udc/at91_udc.c
@@ -1878,7 +1878,9 @@ static int at91udc_probe(struct platform_device *pdev)
 	clk_disable(udc->iclk);
 
 	/* request UDC and maybe VBUS irqs */
-	udc->udp_irq = platform_get_irq(pdev, 0);
+	udc->udp_irq = retval = platform_get_irq(pdev, 0);
+	if (retval < 0)
+		goto err_unprepare_iclk;
 	retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
 				  driver_name, udc);
 	if (retval) {
-- 
2.30.2