netdev - Re: [PATCH v5 net-next 15/16] net: bonding: ensure .ndo_get

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Date:   Fri, 8 Jan 2021 17:43:00 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Eric Dumazet <edumazet@...gle.com>,
        George McCollister <george.mccollister@...il.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Arnd Bergmann <arnd@...db.de>, Taehee Yoo <ap420073@...il.com>,
        Jiri Pirko <jiri@...nulli.us>, Florian Westphal <fw@...len.de>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Pravin B Shelar <pshelar@....org>,
        Sridhar Samudrala <sridhar.samudrala@...el.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH v5 net-next 15/16] net: bonding: ensure .ndo_get_stats64
 can sleep

Sparse says that you...

On Fri,  8 Jan 2021 18:31:58 +0200 Vladimir Oltean wrote:
> +	rcu_read_lock();
> +
> +	bond_for_each_slave_rcu(bond, slave, iter) {
> +		struct bonding_slave_dev *s;
> +
> +		s = kzalloc(sizeof(*s), GFP_ATOMIC);
> +		if (!s) {
> +			rcu_read_unlock();

..unlock..

> +			bond_put_slaves(slaves);
> +			break;
> +		}
> +
> +		s->ndev = slave->dev;
> +		dev_hold(s->ndev);
> +		list_add_tail(&s->list, slaves);
> +		(*num_slaves)++;
> +	}
> +
> +	rcu_read_unlock();

..twice:

drivers/net/bonding/bond_main.c: note: in included file (...):
include/linux/rcupdate.h:700:9: warning: context imbalance in 'bond_get_stats' - unexpected unlock