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198b12f770
In ipoib_remove_one the driver holds the rtnl_lock and tries to do some operation like dev_change_flags or unregister_netdev, while sysfs callback like ipoib_vlan_delete holds sysfs mutex and tries to hold the rtnl_lock via rtnl_trylock() and restart_syscall() if the lock is not free, meanwhile ipoib_remove_one tries to get the sysfs lock in order to free its sysfs directory, and we will get a->b, b->a deadlock. Trace like the following: schedule+0x37/0x80 schedule_preempt_disabled+0xe/0x10 __mutex_lock_slowpath+0xb5/0x120 mutex_lock+0x23/0x40 rtnl_lock+0x15/0x20 netdev_run_todo+0x17c/0x320 rtnl_unlock+0xe/0x10 ipoib_vlan_delete+0x11b/0x1b0 [ib_ipoib] delete_child+0x54/0x80 [ib_ipoib] dev_attr_store+0x18/0x30 sysfs_kf_write+0x37/0x40 mutex_lock+0x16/0x40 SyS_write+0x55/0xc0 entry_SYSCALL_64_fastpath+0x16/0x75 And schedule+0x37/0x80 __kernfs_remove+0x1a8/0x260 ? wake_atomic_t_function+0x60/0x60 kernfs_remove+0x25/0x40 sysfs_remove_dir+0x50/0x80 kobject_del+0x18/0x50 device_del+0x19f/0x260 netdev_unregister_kobject+0x6a/0x80 rollback_registered_many+0x1fd/0x340 rollback_registered+0x3c/0x70 unregister_netdevice_queue+0x55/0xc0 unregister_netdev+0x20/0x30 ipoib_remove_one+0x114/0x1b0 [ib_ipoib] ib_unregister_client+0x4a/0x170 [ib_core] ? find_module_all+0x71/0xa0 ipoib_cleanup_module+0x10/0x94 [ib_ipoib] SyS_delete_module+0x1b5/0x210 entry_SYSCALL_64_fastpath+0x16/0x75 The fix is by checking the flag IPOIB_FLAG_INTF_ON_DESTROY in order to get out from the sysfs function. Fixes:862096a8bb
("IB/ipoib: Add more rtnl_link_ops callbacks") Fixes:9baa0b0364
("IB/ipoib: Add rtnl_link_ops support") Signed-off-by: Erez Shitrit <erezsh@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com>
216 lines
5.4 KiB
C
216 lines
5.4 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <asm/uaccess.h>
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#include "ipoib.h"
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static ssize_t show_parent(struct device *d, struct device_attribute *attr,
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char *buf)
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{
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struct net_device *dev = to_net_dev(d);
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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return sprintf(buf, "%s\n", priv->parent->name);
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}
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static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);
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int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
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u16 pkey, int type)
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{
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int result;
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priv->max_ib_mtu = ppriv->max_ib_mtu;
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/* MTU will be reset when mcast join happens */
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priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
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priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
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priv->parent = ppriv->dev;
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set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
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result = ipoib_set_dev_features(priv, ppriv->ca);
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if (result)
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goto err;
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priv->pkey = pkey;
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memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
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memcpy(&priv->local_gid, &ppriv->local_gid, sizeof(priv->local_gid));
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set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
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priv->dev->broadcast[8] = pkey >> 8;
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priv->dev->broadcast[9] = pkey & 0xff;
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result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
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if (result < 0) {
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ipoib_warn(ppriv, "failed to initialize subinterface: "
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"device %s, port %d",
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ppriv->ca->name, ppriv->port);
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goto err;
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}
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result = register_netdevice(priv->dev);
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if (result) {
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ipoib_warn(priv, "failed to initialize; error %i", result);
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goto register_failed;
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}
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ipoib_create_debug_files(priv->dev);
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/* RTNL childs don't need proprietary sysfs entries */
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if (type == IPOIB_LEGACY_CHILD) {
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if (ipoib_cm_add_mode_attr(priv->dev))
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goto sysfs_failed;
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if (ipoib_add_pkey_attr(priv->dev))
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goto sysfs_failed;
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if (ipoib_add_umcast_attr(priv->dev))
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goto sysfs_failed;
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if (device_create_file(&priv->dev->dev, &dev_attr_parent))
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goto sysfs_failed;
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}
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priv->child_type = type;
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list_add_tail(&priv->list, &ppriv->child_intfs);
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return 0;
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sysfs_failed:
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result = -ENOMEM;
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ipoib_delete_debug_files(priv->dev);
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unregister_netdevice(priv->dev);
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register_failed:
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ipoib_dev_cleanup(priv->dev);
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err:
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return result;
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}
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int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
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{
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struct ipoib_dev_priv *ppriv, *priv;
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char intf_name[IFNAMSIZ];
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struct ipoib_dev_priv *tpriv;
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int result;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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ppriv = netdev_priv(pdev);
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if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
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return -EPERM;
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snprintf(intf_name, sizeof intf_name, "%s.%04x",
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ppriv->dev->name, pkey);
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priv = ipoib_intf_alloc(intf_name);
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if (!priv)
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return -ENOMEM;
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if (!rtnl_trylock())
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return restart_syscall();
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down_write(&ppriv->vlan_rwsem);
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/*
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* First ensure this isn't a duplicate. We check the parent device and
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* then all of the legacy child interfaces to make sure the Pkey
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* doesn't match.
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*/
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if (ppriv->pkey == pkey) {
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result = -ENOTUNIQ;
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goto out;
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}
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list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
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if (tpriv->pkey == pkey &&
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tpriv->child_type == IPOIB_LEGACY_CHILD) {
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result = -ENOTUNIQ;
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goto out;
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}
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}
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result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
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out:
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up_write(&ppriv->vlan_rwsem);
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if (result)
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free_netdev(priv->dev);
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rtnl_unlock();
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return result;
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}
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int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
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{
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struct ipoib_dev_priv *ppriv, *priv, *tpriv;
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struct net_device *dev = NULL;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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ppriv = netdev_priv(pdev);
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if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
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return -EPERM;
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if (!rtnl_trylock())
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return restart_syscall();
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down_write(&ppriv->vlan_rwsem);
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list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
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if (priv->pkey == pkey &&
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priv->child_type == IPOIB_LEGACY_CHILD) {
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unregister_netdevice(priv->dev);
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list_del(&priv->list);
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dev = priv->dev;
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break;
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}
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}
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up_write(&ppriv->vlan_rwsem);
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rtnl_unlock();
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if (dev) {
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free_netdev(dev);
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return 0;
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}
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return -ENODEV;
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}
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