netdev - Re: [PATCH net-next v2] net: sched: don't disable bh when accessing action idr

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Date:   Wed, 23 May 2018 09:32:39 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vlad Buslov <vladbu@...lanox.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, jhs@...atatu.com,
        xiyou.wangcong@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: sched: don't disable bh when accessing
 action idr

Mon, May 21, 2018 at 10:03:04PM CEST, vladbu@...lanox.com wrote:
>Initial net_device implementation used ingress_lock spinlock to synchronize
>ingress path of device. This lock was used in both process and bh context.
>In some code paths action map lock was obtained while holding ingress_lock.
>Commit e1e992e52faa ("[NET_SCHED] protect action config/dump from irqs")
>modified actions to always disable bh, while using action map lock, in
>order to prevent deadlock on ingress_lock in softirq. This lock was removed
>from net_device, so disabling bh, while accessing action map, is no longer
>necessary.
>
>Replace all action idr spinlock usage with regular calls that do not
>disable bh.
>
>Signed-off-by: Vlad Buslov <vladbu@...lanox.com>

Please add my tag to v3, with the description changes requested by Cong.
Acked-by: Jiri Pirko <jiri@...lanox.com>

Thanks!