linux-kernel - [PATCH 2/5] net: stmmac: Move device_can_wakeup() check earlier in set

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Message-ID: <20200727190213.5dcb8ea0@xhacker.debian>
Date:   Mon, 27 Jul 2020 19:02:13 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] net: stmmac: Move device_can_wakeup() check earlier in
 set_wol

If !device_can_wakeup(), there's no need to futher check. And return
-EOPNOTSUPP rather than -EINVAL if !device_can_wakeup().

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 9e0af626a24a..79795bebd3a2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -615,15 +615,15 @@ static int stmmac_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 	struct stmmac_priv *priv = netdev_priv(dev);
 	u32 support = WAKE_MAGIC | WAKE_UCAST;
 
+	if (!device_can_wakeup(priv->device))
+		return -EOPNOTSUPP;
+
 	/* By default almost all GMAC devices support the WoL via
 	 * magic frame but we can disable it if the HW capability
 	 * register shows no support for pmt_magic_frame. */
 	if ((priv->hw_cap_support) && (!priv->dma_cap.pmt_magic_frame))
 		wol->wolopts &= ~WAKE_MAGIC;
 
-	if (!device_can_wakeup(priv->device))
-		return -EINVAL;
-
 	if (wol->wolopts & ~support)
 		return -EINVAL;
 
-- 
2.28.0.rc0