linux-kernel - Re: [PATCH] net: ethernet: mediatek: fixed deadlock captured by lockdep

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Message-Id: <20170704.014357.2098420534003373919.davem@davemloft.net>
Date:   Tue, 04 Jul 2017 01:43:57 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     sean.wang@...iatek.com
Cc:     john@...ozen.org, nbd@...nwrt.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] net: ethernet: mediatek: fixed deadlock captured by
 lockdep

From: <sean.wang@...iatek.com>
Date: Tue, 4 Jul 2017 11:17:36 +0800

> From: Sean Wang <sean.wang@...iatek.com>
> 
> Lockdep found an inconsistent lock state when mtk_get_stats64 is called
> in user context while NAPI updates MAC statistics in softirq.
> 
> Use spin_trylock_bh/spin_unlock_bh fix following lockdep warning.
 ...
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>

Good catch, applied, thanks.