netdev - [PATCH] stmmac: call local_irq_save other than disable_irq in poll

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Date:	Tue, 5 May 2015 15:55:53 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	"David S. Miller" <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>,
	<adi-buildroot-devel@...ts.sourceforge.net>,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: [PATCH] stmmac: call local_irq_save other than disable_irq in poll_controller

From: Sonic Zhang <sonic.zhang@...log.com>

It is possible that poll_controller is called from netpoll.c with irq
already disabled. Unexpected interrupt may be triggered if always
enable irq before returning from poll_controller.

Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 05c146f..830c008 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2465,9 +2465,11 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
  */
 static void stmmac_poll_controller(struct net_device *dev)
 {
-	disable_irq(dev->irq);
+	unsigned long flags;
+
+	local_irq_save(flags);
 	stmmac_interrupt(dev->irq, dev);
-	enable_irq(dev->irq);
+	local_irq_restore(flags);
 }
 #endif
 
-- 
1.7.9.5

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