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From: Jakub Kicinski <kuba@kernel.org>
To: Leon Romanovsky <leon@kernel.org>
Cc: "David S . Miller" <davem@davemloft.net>,
	Leon Romanovsky <leonro@nvidia.com>,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH net-next v1] netdevsim: Forbid devlink reload when adding or deleting ports
Date: Thu, 5 Aug 2021 06:15:47 -0700	[thread overview]
Message-ID: <20210805061547.3e0869ad@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <53cd1a28dd34ced9fb4c39885c6e13523e97d62c.1628161323.git.leonro@nvidia.com>

On Thu,  5 Aug 2021 14:05:41 +0300 Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@nvidia.com>
> 
> In order to remove complexity in devlink core related to
> devlink_reload_enable/disable, let's rewrite new_port/del_port
> logic to rely on internal to netdevsim lock.
> 
> We should protect only reload_down flow because it destroys nsim_dev,
> which is needed for nsim_dev_port_add/nsim_dev_port_del to hold
> port_list_lock.

I don't understand why we only have to protect reload_down.

What protects us from adding a port right after down? That'd hit a
destroyed mutex, up wipes the port list etc...

> +	nsim_bus_dev = nsim_dev->nsim_bus_dev;
> +	if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
> +		return -EOPNOTSUPP;

Why not -EBUSY?

  parent reply	other threads:[~2021-08-05 13:15 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05 11:02 [PATCH net-next] " Leon Romanovsky
2021-08-05 11:05 ` [PATCH net-next v1] " Leon Romanovsky
2021-08-05 12:40 ` [PATCH net-next] " patchwork-bot+netdevbpf
2021-08-05 13:15 ` Jakub Kicinski [this message]
2021-08-05 13:51   ` [PATCH net-next v1] " Leon Romanovsky
2021-08-05 14:23     ` Jakub Kicinski
2021-08-05 14:33       ` Leon Romanovsky
2021-08-05 15:27         ` Jakub Kicinski
2021-08-05 17:35           ` Leon Romanovsky
2021-08-05 18:02             ` Leon Romanovsky
2021-08-05 19:12               ` Jakub Kicinski
2021-08-06 11:19                 ` Leon Romanovsky

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