netdev - Re: [PATCH] net: ethernet : stmicro: fixed power suspend and resume failure in stmmac driver

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Date:	Wed, 01 Oct 2014 13:45:08 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	hliang1025@...il.com
Cc:	peppe.cavallaro@...com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, adi-linux-docs@...ts.sourceforge.net
Subject: Re: [PATCH] net: ethernet : stmicro: fixed power suspend and
 resume failure in stmmac driver

From: Hao Liang <hliang1025@...il.com>
Date: Wed, 1 Oct 2014 14:08:28 +0800

> I double-check my patch and the ->mac->xxx calls are still under the lock.
> I think that lock is trying to protect priv struct and related data, so i
> just remove some functions have no bearing on priv struct.

It's preventing parallel invocations of the ->mac->xxx calls.

The other instances are in device open/close, where RTNL semaphore is
held, and no other code paths in the driver can be active.

You need the lock.
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