linux-kernel - [PATCH] ixp4xx_eth: fix error check return value of platform_get

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Date:   Tue, 12 Apr 2022 08:51:26 +0000
From:   cgel.zte@...il.com
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com
Cc:     linus.walleij@...aro.org, arnd@...db.de, lv.ruyi@....com.cn,
        wanjiabing@...o.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Zeal Robot <zealci@....com.cn>
Subject: [PATCH] ixp4xx_eth: fix error check return value of platform_get_irq()

From: Lv Ruyi <lv.ruyi@....com.cn>

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@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 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 1f382777aa5a..9abbdb71e629 100644
--- a/drivers/net/ethernet/xscale/ptp_ixp46x.c
+++ b/drivers/net/ethernet/xscale/ptp_ixp46x.c
@@ -271,7 +271,7 @@ 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;
-- 
2.25.1