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Date:	Mon, 8 Sep 2014 19:23:11 +0800
From:	Li RongQing <>
To:	David Miller <>
Cc:	Pravin Shelar <>, netdev <>
Subject: Re: [PATCH][net-next] openvswitch: change the data type of error
 status to atomic_long_t

On Mon, Sep 8, 2014 at 7:17 AM, David Miller <> wrote:
> From: Li RongQing <>
> Date: Sun, 7 Sep 2014 17:24:11 +0800
>> 2.  I did not find that tx_dropped/tx_error/.. is protected by spin
>> lock under net dir,
>> sometime tx_dropped is atomic_long_t; sometime it is percpu variable;
>> sometime it is
>> u64,but does not need to protect.
> If it is only modified in ->ndo_start_xmit() then it is protected by
> the per-queue TX lock, as ->ndo_start_xmit() is always invoked with
> it held (except in LLTX drivers of course).

But reading tx_dropped is in process context, and maybe break by interrupt or
soft interrupt,  and no lock protect, or not the same lock protect.

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