netdev - Re: [patch net-next v4 4/7] switchdev: introduce possibility to defer obj

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Date:	Mon, 12 Oct 2015 20:08:23 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Ido Schimmel <idosch@...lanox.com>,
	Elad Raz <eladr@...lanox.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
	"andrew@...n.ch" <andrew@...n.ch>,
	john fastabend <john.fastabend@...il.com>,
	David Laight <David.Laight@...lab.com>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: Re: [patch net-next v4 4/7] switchdev: introduce possibility to defer obj_add/del

On Mon, Oct 12, 2015 at 11:03 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> Similar to the attr usecase, the caller knows if he is holding RTNL and is
> in atomic section. So let the called to decide the correct call variant.
>
> This allows drivers to sleep inside their ops and wait for hw to get the
> operation status. Then the status is propagated into switchdev core.
> This avoids silent errors in drivers.
>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>

<snip>

> +static void switchdev_port_obj_work(struct work_struct *work)
> +{
> +       struct switchdev_obj_work *ow =
> +                       container_of(work, struct switchdev_obj_work, work);
> +       bool rtnl_locked = rtnl_is_locked();
> +       int err;
> +
> +       if (!rtnl_locked)
> +               rtnl_lock();

Same comment as on patch 2/7 about not unconditionally grabbing rtnl_lock.
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