netdev - Re: [PATCH net 4/5] openvswitch: Fix ovs_flow

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Date:	Mon, 03 Feb 2014 20:42:06 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Jesse Gross <jesse@...ira.com>, David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org, dev@...nvswitch.com,
	Pravin B Shelar <pshelar@...ira.com>
Subject: Re: [PATCH net 4/5] openvswitch: Fix ovs_flow_free() ovs-lock assert.

Hello.

On 03-02-2014 5:08, Jesse Gross wrote:

> From: Pravin B Shelar <pshelar@...ira.com>

> ovs_flow_free() is not called under ovs-lock during packet
> execute path (ovs_packet_cmd_execute()). Since packet execute
> does not touch flow->mask, there is no need to take that
> lock either. So move assert in case where flow->mask is checked.

> Found by code inspection.

> Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
> Signed-off-by: Jesse Gross <jesse@...ira.com>
> ---
>   net/openvswitch/flow_table.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)

> diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
> index bd14052..ad0bda0 100644
> --- a/net/openvswitch/flow_table.c
> +++ b/net/openvswitch/flow_table.c
> @@ -158,11 +158,12 @@ void ovs_flow_free(struct sw_flow *flow, bool deferred)
>   	if (!flow)
>   		return;
>
> -	ASSERT_OVSL();
> -
>   	if (flow->mask) {
>   		struct sw_flow_mask *mask = flow->mask;
>
> +		/* ovs-lock is required to protect mask-refcount and
> +		 * mask list. */

    Networking multi-line comment style is:

/* bla
  * bla
  */

WBR, Sergei

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