netdev - Re: [PATCH net] dcbnl : Disable software interrupts before taking dcb

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Date:	Sun, 16 Nov 2014 14:51:26 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	anish@...lsio.com
Cc:	netdev@...r.kernel.org, john.fastabend@...il.com,
	neerav.parikh@...el.com
Subject: Re: [PATCH net] dcbnl : Disable software interrupts before taking
 dcb_lock

From: Anish Bhatt <anish@...lsio.com>
Date: Fri, 14 Nov 2014 16:38:31 -0800

> Solves possible lockup issues that can be seen from firmware DCB agents calling
> into the DCB app api.
> 
> DCB firmware event queues can be tied in with NAPI so that dcb events are
> generated in softIRQ context. This can results in calls to dcb_*app()
> functions which try to take the dcb_lock.
> 
> If the the event triggers while we also have the dcb_lock because lldpad or
> some other agent happened to be issuing a  get/set command we could see a cpu
> lockup.
> 
> This code was not originally written with firmware agents in mind, hence
> grabbing dcb_lock from softIRQ context was not considered.
> 
> Signed-off-by: Anish Bhatt <anish@...lsio.com>

Applied, thanks.
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