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Date: Fri, 13 May 2011 09:15:09 +0200
From: Jiri Pirko <jpirko@...hat.com>
To: Weiping Pan <panweiping3@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <eric.dumazet@...il.com>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>,
Tom Herbert <therbert@...gle.com>,
Ben Hutchings <bhutchings@...arflare.com>,
"open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net:set valid name before calling ndo_init()
Fri, May 13, 2011 at 03:46:56AM CEST, panweiping3@...il.com wrote:
>In commit 1c5cae815d19 (net: call dev_alloc_name from register_netdevice),
>a bug of bonding was invloved, see example 1 and 2.
>
>In register_netdevice(), the name of net_device is not valid until
>dev_get_valid_name() is called. But dev->netdev_ops->ndo_init(that is
>bond_init) is called before dev_get_valid_name(),
>and it uses the invalid name of net_device.
>
>I think register_netdevice() should make sure that the name of net_device is
>valid before calling ndo_init().
>
>example 1:
>modprobe bonding
>ls /proc/net/bonding/bond%d
>
>ps -eLf
>root 3398 2 3398 0 1 21:34 ? 00:00:00 [bond%d]
>
>example 2:
>modprobe bonding max_bonds=3
>
>[ 170.100292] bonding: Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
>[ 170.101090] bonding: Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.
>[ 170.102469] ------------[ cut here ]------------
>[ 170.103150] WARNING: at /home/pwp/net-next-2.6/fs/proc/generic.c:586 proc_register+0x126/0x157()
>[ 170.104075] Hardware name: VirtualBox
>[ 170.105065] proc_dir_entry 'bonding/bond%d' already registered
>[ 170.105613] Modules linked in: bonding(+) sunrpc ipv6 uinput microcode ppdev parport_pc parport joydev e1000 pcspkr i2c_piix4 i2c_core [last unloaded: bonding]
>[ 170.108397] Pid: 3457, comm: modprobe Not tainted 2.6.39-rc2+ #14
>[ 170.108935] Call Trace:
>[ 170.109382] [<c0438f3b>] warn_slowpath_common+0x6a/0x7f
>[ 170.109911] [<c051a42a>] ? proc_register+0x126/0x157
>[ 170.110329] [<c0438fc3>] warn_slowpath_fmt+0x2b/0x2f
>[ 170.110846] [<c051a42a>] proc_register+0x126/0x157
>[ 170.111870] [<c051a4dd>] proc_create_data+0x82/0x98
>[ 170.112335] [<f94e6af6>] bond_create_proc_entry+0x3f/0x73 [bonding]
>[ 170.112905] [<f94dd806>] bond_init+0x77/0xa5 [bonding]
>[ 170.113319] [<c0721ac6>] register_netdevice+0x8c/0x1d3
>[ 170.113848] [<f94e0e30>] bond_create+0x6c/0x90 [bonding]
>[ 170.114322] [<f94f4763>] bonding_init+0x763/0x7b1 [bonding]
>[ 170.114879] [<c0401240>] do_one_initcall+0x76/0x122
>[ 170.115317] [<f94f4000>] ? 0xf94f3fff
>[ 170.115799] [<c0463f1e>] sys_init_module+0x1286/0x140d
>[ 170.116879] [<c07c6d9f>] sysenter_do_call+0x12/0x28
>[ 170.117404] ---[ end trace 64e4fac3ae5fff1a ]---
>[ 170.117924] bond%d: Warning: failed to register to debugfs
>[ 170.128728] ------------[ cut here ]------------
>[ 170.129360] WARNING: at /home/pwp/net-next-2.6/fs/proc/generic.c:586 proc_register+0x126/0x157()
>[ 170.130323] Hardware name: VirtualBox
>[ 170.130797] proc_dir_entry 'bonding/bond%d' already registered
>[ 170.131315] Modules linked in: bonding(+) sunrpc ipv6 uinput microcode ppdev parport_pc parport joydev e1000 pcspkr i2c_piix4 i2c_core [last unloaded: bonding]
>[ 170.133731] Pid: 3457, comm: modprobe Tainted: G W 2.6.39-rc2+ #14
>[ 170.134308] Call Trace:
>[ 170.134743] [<c0438f3b>] warn_slowpath_common+0x6a/0x7f
>[ 170.135305] [<c051a42a>] ? proc_register+0x126/0x157
>[ 170.135820] [<c0438fc3>] warn_slowpath_fmt+0x2b/0x2f
>[ 170.137168] [<c051a42a>] proc_register+0x126/0x157
>[ 170.137700] [<c051a4dd>] proc_create_data+0x82/0x98
>[ 170.138174] [<f94e6af6>] bond_create_proc_entry+0x3f/0x73 [bonding]
>[ 170.138745] [<f94dd806>] bond_init+0x77/0xa5 [bonding]
>[ 170.139278] [<c0721ac6>] register_netdevice+0x8c/0x1d3
>[ 170.139828] [<f94e0e30>] bond_create+0x6c/0x90 [bonding]
>[ 170.140361] [<f94f4763>] bonding_init+0x763/0x7b1 [bonding]
>[ 170.140927] [<c0401240>] do_one_initcall+0x76/0x122
>[ 170.141494] [<f94f4000>] ? 0xf94f3fff
>[ 170.141975] [<c0463f1e>] sys_init_module+0x1286/0x140d
>[ 170.142463] [<c07c6d9f>] sysenter_do_call+0x12/0x28
>[ 170.142974] ---[ end trace 64e4fac3ae5fff1b ]---
>[ 170.144949] bond%d: Warning: failed to register to debugfs
>
>Signed-off-by: Weiping Pan <panweiping3@...il.com>
>---
> net/core/dev.c | 8 ++++----
> 1 files changed, 4 insertions(+), 4 deletions(-)
>
>diff --git a/net/core/dev.c b/net/core/dev.c
>index ea23353..3ed09f8 100644
>--- a/net/core/dev.c
>+++ b/net/core/dev.c
>@@ -5437,6 +5437,10 @@ int register_netdevice(struct net_device *dev)
>
> dev->iflink = -1;
>
>+ ret = dev_get_valid_name(dev, dev->name);
>+ if (ret < 0)
>+ goto out;
>+
> /* Init, if this function is available */
> if (dev->netdev_ops->ndo_init) {
> ret = dev->netdev_ops->ndo_init(dev);
>@@ -5447,10 +5451,6 @@ int register_netdevice(struct net_device *dev)
> }
> }
>
>- ret = dev_get_valid_name(dev, dev->name);
>- if (ret < 0)
>- goto err_uninit;
>-
> dev->ifindex = dev_new_index(net);
> if (dev->iflink == -1)
> dev->iflink = dev->ifindex;
>--
>1.7.4.4
>
>--
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Reviewed-by: Jiri Pirko <jpirko@...hat.com>
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