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From: Jamal Hadi Salim <jhs@mojatatu.com>
To: Vlad Buslov <vladbu@mellanox.com>, davem@davemloft.net
Cc: netdev@vger.kernel.org, xiyou.wangcong@gmail.com,
	jiri@resnulli.us, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v2] net: sched: don't disable bh when accessing action idr
Date: Tue, 22 May 2018 08:50:06 -0400	[thread overview]
Message-ID: <1719721d-35ed-7baa-6dec-c3f7f6fc79ff@mojatatu.com> (raw)
In-Reply-To: <1526932984-11544-1-git-send-email-vladbu@mellanox.com>

On 21/05/18 04:03 PM, Vlad Buslov 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@mellanox.com>

Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>

cheers,
jamal

  reply	other threads:[~2018-05-22 12:50 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-18 15:45 [PATCH] net: sched: don't disable bh when accessing action idr Vlad Buslov
2018-05-19  2:59 ` Cong Wang
2018-05-19 10:12   ` Vlad Buslov
2018-05-20  3:02     ` David Miller
2018-05-21 20:03       ` [PATCH net-next v2] " Vlad Buslov
2018-05-22 12:50         ` Jamal Hadi Salim [this message]
2018-05-23  1:10         ` Cong Wang
2018-05-23  6:57           ` Vlad Buslov
2018-05-23  7:32         ` Jiri Pirko
2018-05-23  8:52           ` [PATCH net-next v3] " Vlad Buslov
2018-05-23 23:14             ` Cong Wang
2018-05-24 16:54               ` Vlad Buslov

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