From: David S. Miller <davem@sunset.davemloft.net>
Date: Fri, 29 Dec 2006 05:14:52 +0000 (-0800)
Subject: [NET]: Add memory barrrier to netif_poll_enable()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e44c39bd8478bf9e41cbc611c74b5879a7b29f58;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[NET]: Add memory barrrier to netif_poll_enable()

When a driver writer calls this, they generally expect that
all previous stores and modifications they've made will be
visible before netif_poll_enable() executes, so ensure this.

Noticed by Ben H.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 6be767c76b37..fea0d9db6846 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -906,6 +906,7 @@ static inline void netif_poll_disable(struct net_device *dev)
 
 static inline void netif_poll_enable(struct net_device *dev)
 {
+	smp_mb__before_clear_bit();
 	clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 }