netdev - [PATCH] net: allwinner: remove redundant irqsave and irqrestore in hardIRQ

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Date:   Tue, 22 Sep 2020 13:56:15 +1200
From:   Barry Song <song.bao.hua@...ilicon.com>
To:     <kuba@...nel.org>, <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     Barry Song <song.bao.hua@...ilicon.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>
Subject: [PATCH] net: allwinner: remove redundant irqsave and irqrestore in hardIRQ

The comment "holders of db->lock must always block IRQs" and related
code to do irqsave and irqrestore don't make sense since we are in a
IRQ-disabled hardIRQ context.

Cc: Maxime Ripard <mripard@...nel.org>
Cc: Chen-Yu Tsai <wens@...e.org>
Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>
---
 drivers/net/ethernet/allwinner/sun4i-emac.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index b3b8a8010142..862ea44beea7 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -640,13 +640,11 @@ static irqreturn_t emac_interrupt(int irq, void *dev_id)
 	struct net_device *dev = dev_id;
 	struct emac_board_info *db = netdev_priv(dev);
 	int int_status;
-	unsigned long flags;
 	unsigned int reg_val;
 
 	/* A real interrupt coming */
 
-	/* holders of db->lock must always block IRQs */
-	spin_lock_irqsave(&db->lock, flags);
+	spin_lock(&db->lock);
 
 	/* Disable all interrupts */
 	writel(0, db->membase + EMAC_INT_CTL_REG);
@@ -680,7 +678,7 @@ static irqreturn_t emac_interrupt(int irq, void *dev_id)
 		reg_val |= (0xf << 0) | (0x01 << 8);
 		writel(reg_val, db->membase + EMAC_INT_CTL_REG);
 	}
-	spin_unlock_irqrestore(&db->lock, flags);
+	spin_unlock(&db->lock);
 
 	return IRQ_HANDLED;
 }
-- 
2.25.1