netdev - [PATCH] sh_eth: fix branch prediction in sh_eth

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Message-ID: <2810883.6xQhqSTVDe@wasted.cogentembedded.com>
Date:   Fri, 30 Dec 2016 00:07:38 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Cc:     ben.hutchings@...ethink.co.uk
Subject: [PATCH] sh_eth: fix branch prediction in sh_eth_interrupt()

IIUC, likely()/unlikely() should apply to the whole *if* statement's
expression, not a part of it  -- fix such expression in  sh_eth_interrupt()
accordingly...

Fixes: 283e38db65e7 ("sh_eth: Fix serialisation of interrupt disable with interrupt & NAPI handlers")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

---
The patch is against DaveM's 'net-next.git' repo; I'm not sure if it should
be  targeted to the 'net.git' repo instead...

 drivers/net/ethernet/renesas/sh_eth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -1656,7 +1656,7 @@ static irqreturn_t sh_eth_interrupt(int
 	else
 		goto out;
 
-	if (!likely(mdp->irq_enabled)) {
+	if (unlikely(!mdp->irq_enabled)) {
 		sh_eth_write(ndev, 0, EESIPR);
 		goto out;
 	}