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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Zeal Robot <zealci@zte.com.cn>,
        Lv Ruyi <lv.ruyi@zte.com.cn>,
        Linus Walleij <linus.walleij@linaro.org>,
        Jakub Kicinski <kuba@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.17 262/772] ixp4xx_eth: fix error check return value of platform_get_irq()
Date:   Tue,  7 Jun 2022 18:57:34 +0200
Message-Id: <20220607164956.744179188@linuxfoundation.org>
In-Reply-To: <20220607164948.980838585@linuxfoundation.org>
References: <20220607164948.980838585@linuxfoundation.org>
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From: Lv Ruyi <lv.ruyi@zte.com.cn>

[ Upstream commit f45ba67eb74ab4b775616af731bdf8944afce3f1 ]

platform_get_irq() return negative value on failure, so null check of
return value is incorrect. Fix it by comparing whether it is less than
zero.

Fixes: 9055a2f59162 ("ixp4xx_eth: make ptp support a platform driver")
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220412085126.2532924-1-lv.ruyi@zte.com.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/xscale/ptp_ixp46x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/xscale/ptp_ixp46x.c b/drivers/net/ethernet/xscale/ptp_ixp46x.c
index 39234852e01b..20f6aa508003 100644
--- a/drivers/net/ethernet/xscale/ptp_ixp46x.c
+++ b/drivers/net/ethernet/xscale/ptp_ixp46x.c
@@ -272,7 +272,7 @@ static int ptp_ixp_probe(struct platform_device *pdev)
 	ixp_clock.master_irq = platform_get_irq(pdev, 0);
 	ixp_clock.slave_irq = platform_get_irq(pdev, 1);
 	if (IS_ERR(ixp_clock.regs) ||
-	    !ixp_clock.master_irq || !ixp_clock.slave_irq)
+	    ixp_clock.master_irq < 0 || ixp_clock.slave_irq < 0)
 		return -ENXIO;
 
 	ixp_clock.caps = ptp_ixp_caps;
-- 
2.35.1