linux-kernel - Re: [PATCH v2] openvswitch: Disable bottom half when grabbing stats lock in userspace context

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Message-ID: <CALnjE+pwjMCDUPP8+DsAbamNxk8nVFKqTa3yC8sZNYFqeFGjHQ@mail.gmail.com>
Date:	Thu, 27 Feb 2014 15:04:56 -0800
From:	Pravin Shelar <pshelar@...ira.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
Cc:	Jesse Gross <jesse@...ira.com>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] openvswitch: Disable bottom half when grabbing stats
 lock in userspace context

On Thu, Feb 27, 2014 at 2:10 PM, Zoltan Kiss <zoltan.kiss@...rix.com> wrote:
> The megaflow feature introduced per-CPU stats, and the new code did some
> refactoring as well [1]. However the new functions doesn't disable bottom halves
> when locking the stat, and as they can be called from userspace context, they
> can be interrupted by netif_receive_skb.
>
> [1] e298e50570: openvswitch: Per cpu flow stats.
>
This bug is fixed in openvswitch repo by commit "datapath: Fix
deadlock during stats update."


Thanks.
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