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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-11-01 02:21:16 +00:00
76c455decb
team_get_port_by_index_rcu() might return NULL due to race between port removal and skb tx path. Panic is easily triggeable when txing packets and adding/removing port in a loop. introduced by commit3d249d4ca"net: introduce ethernet teaming device" and commit753f993911"team: introduce random mode" (for random mode) Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* drivers/net/team/team_mode_roundrobin.c - Round-robin mode for team
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* Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/if_team.h>
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struct rr_priv {
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unsigned int sent_packets;
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};
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static struct rr_priv *rr_priv(struct team *team)
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{
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return (struct rr_priv *) &team->mode_priv;
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}
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static bool rr_transmit(struct team *team, struct sk_buff *skb)
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{
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struct team_port *port;
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int port_index;
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port_index = rr_priv(team)->sent_packets++ % team->en_port_count;
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port = team_get_port_by_index_rcu(team, port_index);
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if (unlikely(!port))
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goto drop;
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port = team_get_first_port_txable_rcu(team, port);
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if (unlikely(!port))
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goto drop;
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if (team_dev_queue_xmit(team, port, skb))
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return false;
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return true;
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drop:
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dev_kfree_skb_any(skb);
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return false;
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}
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static const struct team_mode_ops rr_mode_ops = {
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.transmit = rr_transmit,
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.port_enter = team_modeop_port_enter,
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.port_change_dev_addr = team_modeop_port_change_dev_addr,
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};
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static const struct team_mode rr_mode = {
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.kind = "roundrobin",
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.owner = THIS_MODULE,
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.priv_size = sizeof(struct rr_priv),
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.ops = &rr_mode_ops,
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};
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static int __init rr_init_module(void)
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{
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return team_mode_register(&rr_mode);
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}
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static void __exit rr_cleanup_module(void)
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{
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team_mode_unregister(&rr_mode);
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}
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module_init(rr_init_module);
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module_exit(rr_cleanup_module);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
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MODULE_DESCRIPTION("Round-robin mode for team");
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MODULE_ALIAS("team-mode-roundrobin");
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