dev_disable_lro identifier - Linux source code next-20260811

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linux

Versions

FIXME
- FIXME
  - next-20260811

Documented in 1 files:

net/core/dev_api.c, line 256

Defined in 1 files as a prototype:

include/linux/netdevice.h, line 3445 (as a prototype)

Defined in 1 files as a function:

net/core/dev_api.c, line 264 (as a function)

Referenced in 8 files:

Smatch caller information:

net/bridge/br_if.c br_add_if() -> dev_disable_lro()

Type	Parameter	Key	Value
PARAM_VALUE	0	dev	4096-ptr_max
PARAM_VALUE	0	dev->addr_len	6
PARAM_VALUE	0	dev->dev_addr	4096-ptr_max
PARAM_VALUE	0	dev->dsa_ptr	0,4096-ptr_max
PARAM_VALUE	0	dev->lock.dep_map->name	0-255
PARAM_VALUE	0	dev->lock.first_waiter->list.prev->next	5159360019465732096
PARAM_VALUE	0	dev->lock.first_waiter->list.prev->prev	5159360019465732096
PARAM_VALUE	0	dev->lock.first_waiter->task->blocked_lock.dep_map->name	0-255
PARAM_VALUE	0	dev->lock.first_waiter->task->blocked_lock.owner	(-1)
PARAM_VALUE	0	dev->lock.first_waiter->task->blocked_lock.owner_cpu	4294967295
PARAM_VALUE	0	dev->lock.first_waiter->task->blocked_lock.raw_lock.val.counter	s32min-s32max
PARAM_VALUE	0	dev->lock.first_waiter->task->usage.refs.counter	s32min-s32max
PARAM_VALUE	0	dev->netdev_ops	4096-ptr_max
PARAM_VALUE	0	dev->netdev_ops->ndo_set_config	0,1586268954384080896,2133952100825280512,4430316855586635776
PARAM_VALUE	0	dev->netdev_ops->ndo_start_xmit	0-4996989802272788479,4996989802272788481-u64max
PARAM_VALUE	0	dev->priv->curr_active_slave->dev->refcnt_tracker.quarantine_avail	0-4294967295
PARAM_VALUE	0	dev->priv->curr_active_slave->dev->rx_mode_retry_timer.flags	0-4294967295
PARAM_VALUE	0	dev->priv->curr_active_slave->dev->work_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	0	dev->priv->curr_active_slave->dev->work_tracker->dead	0-1
PARAM_VALUE	0	dev->priv->curr_active_slave->dev->work_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	0	dev->priv->fbd->fw_cap.need_bmc_macda_sync	1
PARAM_VALUE	0	dev->priv->fbd->tce_tcam_last	0-255
PARAM_VALUE	0	dev->priv->fs->l2.allmulti.rule->num_rules	s32min-(-1),1-s32max
PARAM_VALUE	0	dev->priv->fs->l2.allmulti_enabled	0-1
PARAM_VALUE	0	dev->priv->fs->l2.broadcast.rule->num_rules	s32min-(-1),1-s32max
PARAM_VALUE	0	dev->priv->fs->l2.broadcast_enabled	0-1
PARAM_VALUE	0	dev->priv->fs->l2.ft.t->node.lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	dev->priv->fs->l2.ft.t->node.lock.first_waiter->list.next	2212933610777083904,2624917664208203776
PARAM_VALUE	0	dev->priv->fs->l2.ft.t->node.lock.first_waiter->type	0-1
PARAM_VALUE	0	dev->priv->fs->l2.promisc_enabled	0-1
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.pool->dev->iommu->fault_param->queue->wq->flush_color	s32min-s32max
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.pool->dev->iommu->fault_param->queue->wq->work_color	s32min-s32max
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.pool->dev->iommu->lock.first_waiter->task->blocked_on	(-1)-0
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.pool->dev->iommu->lock.osq.tail.counter	s32min-s32max
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.token	1-255
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.throttle_sem.count	0-4294967295
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.throttle_sem.first_waiter->list.next	5349227543279349760
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.throttle_sem.first_waiter->list.prev->next	5349227543279349760
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.throttle_sem.first_waiter->up	0-1
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.throttle_sem.lock.owner	(-1)
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.throttle_sem.lock.owner_cpu	4294967295
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.throttle_sem.lock.raw_lock.val.counter	0-s32max
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.unprivileged_sem.count	0-4294967295
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.unprivileged_sem.first_waiter->list.next	5349227543279349760
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.unprivileged_sem.first_waiter->list.prev->next	5349227543279349760
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.unprivileged_sem.first_waiter->up	0-1
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.unprivileged_sem.lock.owner	(-1)
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.unprivileged_sem.lock.owner_cpu	4294967295
PARAM_VALUE	0	dev->priv->fs->mdev->cmd.vars.unprivileged_sem.lock.raw_lock.val.counter	0-s32max
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->autogroup.active	1
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->autogroup.num_groups	0-4294967295
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->fgs_hash.ht.nelems.counter	s32min-s32max
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->fgs_hash.ht.run_irq_work.node.a_flags.counter	s32min-s32max
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->fgs_hash.ht.tbl->hash_rnd	0-4294967295
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->fgs_hash.ht.tbl->nest	0-4294967295
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->fgs_hash.ht.tbl->size	0-4294967295
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->node.lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->node.lock.first_waiter->list.next	2212933610777083904,2624917664208203776
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->node.lock.first_waiter->type	0-1
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->node.refcount.refs.counter	s32min-s32max
PARAM_VALUE	0	dev->priv->fs->promisc.ft.t->node.version.counter	s32min-s32max
PARAM_VALUE	0	dev->priv->lowerdev->lock.dep_map->name	0-255
PARAM_VALUE	0	dev->priv->lowerdev->refcnt_tracker.quarantine_avail	0-4294967295
PARAM_VALUE	0	dev->priv->lowerdev->rx_mode_retry_timer.flags	0-4294967295
PARAM_VALUE	0	dev->priv->lowerdev->work_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	0	dev->priv->lowerdev->work_tracker->dead	0-1
PARAM_VALUE	0	dev->priv->lowerdev->work_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	0	dev->priv->phy_dev->lock.dep_map->name	0-255
PARAM_VALUE	0	dev->priv->phy_dev->refcnt_tracker.quarantine_avail	0-4294967295
PARAM_VALUE	0	dev->priv->phy_dev->rx_mode_retry_timer.flags	0-4294967295
PARAM_VALUE	0	dev->priv->phy_dev->work_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	0	dev->priv->phy_dev->work_tracker->dead	0-1
PARAM_VALUE	0	dev->priv->phy_dev->work_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	0	dev->priv->vf_netdev->lock.dep_map->name	0-255
PARAM_VALUE	0	dev->priv->vf_netdev->refcnt_tracker.quarantine_avail	0-4294967295
PARAM_VALUE	0	dev->priv->vf_netdev->rx_mode_retry_timer.flags	0-4294967295
PARAM_VALUE	0	dev->priv->vf_netdev->work_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	0	dev->priv->vf_netdev->work_tracker->dead	0-1
PARAM_VALUE	0	dev->priv->vf_netdev->work_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	0	dev->priv_flags	0,512-u32max
PARAM_VALUE	0	dev->refcnt_tracker.list.next->next	4096-ptr_max
PARAM_VALUE	0	dev->refcnt_tracker.list.next->prev	4096-ptr_max
PARAM_VALUE	0	dev->refcnt_tracker.quarantine.prev	4096-ptr_max
PARAM_VALUE	0	dev->refcnt_tracker.quarantine.prev->next	4096-ptr_max
PARAM_VALUE	0	dev->refcnt_tracker.quarantine.prev->next->next	4096-ptr_max
PARAM_VALUE	0	dev->rtnl_link_ops->alloc	0,1182153660833808384,3130032447137456128
PARAM_VALUE	0	dev->rtnl_link_ops->get_num_rx_queues	0,1694260139628544000,4559208055891021824,7097615251001798656,8443738062496038912
PARAM_VALUE	0	dev->rtnl_link_ops->get_num_tx_queues	0,1694260139628544000,4559208055891021824,7071371917186535424,8443738062496038912
PARAM_VALUE	0	dev->rtnl_link_ops->maxtype	0-6,8-10,15,18,20,22,24,34,50
PARAM_VALUE	0	dev->rtnl_link_ops->peer_type	0-1
PARAM_VALUE	0	dev->rtnl_link_ops->priv_size	0,8,32,40,48,56,88,112,120,144,160,224,240,256,296,616,624,728,736,744,1056,1128,1336,1616,2176,2240,2272,2560,3296,3552,3720,9688-u64max
PARAM_VALUE	0	dev->rtnl_link_ops->setup	0,4096-ptr_max
PARAM_VALUE	0	dev->rtnl_link_ops->validate	0,4096-ptr_max
PARAM_VALUE	0	dev->rx_handler	5624006078316113920,6212332457991983104
PARAM_VALUE	0	dev->rx_handler_data	4096-ptr_max
PARAM_VALUE	0	dev->rx_mode_addr_cache.list.next	4096-ptr_max
PARAM_VALUE	0	dev->rx_mode_addr_cache.list.next->prev	4096-ptr_max
PARAM_VALUE	0	dev->rx_mode_retry_timer.entry->pprev	4096-ptr_max
PARAM_VALUE	0	dev->rx_mode_retry_timer.entry.pprev	0,4096-ptr_max
PARAM_VALUE	0	dev->type	1
PARAM_VALUE	0	dev->work_node.next	4096-ptr_max
PARAM_VALUE	0	dev->work_node.next->next	4096-ptr_max
PARAM_VALUE	0	dev->work_node.next->prev	4096-ptr_max
PARAM_VALUE	0	dev->work_node.prev	4096-ptr_max
PARAM_VALUE	0	dev->work_node.prev->next	4096-ptr_max
PARAM_VALUE	0	dev->work_node.prev->prev	4096-ptr_max
PARAM_VALUE	0	dev->work_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	0	dev->work_tracker->dead	0-1
PARAM_VALUE	0	dev->work_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	0	*dev->name	0-255
PARAM_VALUE	0	*dev->priv->fs->mdev->cmd.vars.throttle_sem.lock.owner	(-4611686018427387904)-4611686018427387903
PARAM_VALUE	0	*dev->priv->fs->mdev->cmd.vars.unprivileged_sem.lock.owner	(-4611686018427387904)-4611686018427387903
PARAM_VALUE	0	*dev->priv->fs->promisc.ft->t->lock.first_waiter->task->blocked_lock.owner	(-4611686018427387904)-4611686018427387903
PARAM_VALUE	0	*dev->priv->fs->promisc.ft.t->lock.first_waiter->task->blocked_lock.owner	(-4611686018427387904)-4611686018427387903
PARAM_VALUE	0	*dev->priv->fs->promisc.rule->num_rules	s32min-(-1),1-s32max
BUF_SIZE	0	dev->nd_net.net	(-1),10304,10432
DATA_SOURCE	0	dev	$1
BIT_INFO	0	dev->priv_flags	0x200,0xffffffbf
NOSPEC	0	dev->flags
NOSPEC	0	dev->ifindex
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
USER_DATA	0	dev->flags	0-527361[c]
USER_DATA	0	dev->ifindex	0-s32max[c]
NO_OVERFLOW_SIMPLE	0	dev->group
NO_OVERFLOW_SIMPLE	0	dev->tx_queue_len
HALF_LOCKED2		global &rtnl_mutex

net/hsr/hsr_slave.c hsr_portdev_setup() -> dev_disable_lro()

Type	Parameter	Key	Value
PARAM_VALUE	0	dev	4096-ptr_max
PARAM_VALUE	0	dev->addr_len	6
PARAM_VALUE	0	dev->dev_addr	4096-ptr_max
PARAM_VALUE	0	dev->netdev_ops->ndo_start_xmit	0-5595975123453214719,5595975123453214721-u64max
PARAM_VALUE	0	dev->rtnl_link_ops->alloc	0,1182153660833808384,3130032447137456128
PARAM_VALUE	0	dev->rtnl_link_ops->get_num_rx_queues	0,1694260139628544000,4559208055891021824,7097615251001798656,8443738062496038912
PARAM_VALUE	0	dev->rtnl_link_ops->get_num_tx_queues	0,1694260139628544000,4559208055891021824,7071371917186535424,8443738062496038912
PARAM_VALUE	0	dev->rtnl_link_ops->maxtype	0-6,8-10,15,18,20,22,24,34,50
PARAM_VALUE	0	dev->rtnl_link_ops->peer_type	0-1
PARAM_VALUE	0	dev->rtnl_link_ops->priv_size	0,8,32,40,48,56,88,112,120,144,160,224,240,256,296,616,624,728,736,1056,1128,1336,1616,2176,2240,2272,2560,3296,3720,9688-s64max
PARAM_VALUE	0	dev->rx_handler	6692511236796559360
PARAM_VALUE	0	dev->rx_handler_data	4096-ptr_max
PARAM_VALUE	0	dev->type	1
DATA_SOURCE	0	dev	$1
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
NO_OVERFLOW_SIMPLE	0	dev->group
LOCK2		global &rtnl_mutex
HALF_LOCKED2		&dev->ethtool->rss_lock
HALF_LOCKED2		&net->xfrm.xfrm_cfg_mutex
HALF_LOCKED2		&ops->srcu
HALF_LOCKED2		global &audit_cmd_mutex.lock
HALF_LOCKED2		global &cb_lock
HALF_LOCKED2		global &crypto_cfg_mutex
HALF_LOCKED2		global &hwsim_phys_lock
HALF_LOCKED2		global &rx_queue_mutex

net/openvswitch/vport-netdev.c ovs_netdev_link() -> dev_disable_lro()

Type	Parameter	Key	Value
PARAM_VALUE	0	dev	4096-ptr_max
PARAM_VALUE	0	dev->netdev_ops	0-6094825694584074239,6094825694584074241-u64max
PARAM_VALUE	0	dev->refcnt_tracker.list.next	4096-ptr_max
PARAM_VALUE	0	dev->refcnt_tracker.list.next->next	4096-ptr_max
PARAM_VALUE	0	dev->refcnt_tracker.list.next->prev	4096-ptr_max
PARAM_VALUE	0	dev->reg_state	1
PARAM_VALUE	0	dev->rx_handler	8924616263966158848
PARAM_VALUE	0	dev->rx_handler_data	4096-ptr_max
PARAM_VALUE	0	dev->type	1,65534
BIT_INFO	0	dev->flags	0x0,0xfffffff7
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
LOCK2		global &ovs_mutex
LOCK2		global &rtnl_mutex
HALF_LOCKED2		&dev->ethtool->rss_lock
HALF_LOCKED2		&dev->lock
HALF_LOCKED2		&devlink->lock
HALF_LOCKED2		&net->xfrm.xfrm_cfg_mutex
HALF_LOCKED2		global &audit_cmd_mutex.lock
HALF_LOCKED2		global &cb_lock
HALF_LOCKED2		global &crypto_cfg_mutex
HALF_LOCKED2		global &dpll_lock
HALF_LOCKED2		global &hwsim_phys_lock
HALF_LOCKED2		global &net_dm_mutex
HALF_LOCKED2		global &rx_queue_mutex
HALF_LOCKED2		rcu_read

net/ipv6/addrconf.c dev_forward_change() -> dev_disable_lro()

Type	Parameter	Key	Value
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
UNITS	0	dev	unit_byte
LOCK2		&net->rtnl_mutex
LOCK2		global &rtnl_mutex
HALF_LOCKED2		&pool->lock
TYPE_LOCK		(struct net)->rtnl_mutex

drivers/net/team/team_core.c team_port_add() -> dev_disable_lro()

Type	Parameter	Key	Value
PARAM_VALUE	0	dev	4096-ptr_max
PARAM_VALUE	0	dev->addr_len	0-255
PARAM_VALUE	0	dev->addr_list_lock.rlock.dep_map->name	0-255
PARAM_VALUE	0	dev->dev.parent->iommu->attach_deferred	0-1
PARAM_VALUE	0	dev->lock.dep_map->name	0-255
PARAM_VALUE	0	dev->lock.first_waiter->list.prev->next	5159360019465732096
PARAM_VALUE	0	dev->lock.first_waiter->list.prev->prev	5159360019465732096
PARAM_VALUE	0	dev->lock.first_waiter->task->blocked_on	(-1)-0
PARAM_VALUE	0	dev->mctp_ptr->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	0	dev->netdev_ops	4096-ptr_max
PARAM_VALUE	0	dev->netdev_ops->ndo_set_config	0,1586268954384080896,2133952100825280512,4430316855586635776
PARAM_VALUE	0	dev->npinfo->dev_lock.first_waiter->list.next	5349227543279349760
PARAM_VALUE	0	dev->npinfo->dev_lock.first_waiter->list.prev	5349227543279349760
PARAM_VALUE	0	dev->npinfo->dev_lock.first_waiter->list.prev->next	5349227543279349760
PARAM_VALUE	0	dev->npinfo->dev_lock.first_waiter->up	1
PARAM_VALUE	0	dev->npinfo->dev_lock.last_holder	0
PARAM_VALUE	0	dev->npinfo->dev_lock.lock.dep_map->name	0-255
PARAM_VALUE	0	dev->npinfo->dev_lock.lock.owner	(-1)
PARAM_VALUE	0	dev->npinfo->dev_lock.lock.owner_cpu	u32max
PARAM_VALUE	0	dev->npinfo->dev_lock.lock.raw_lock.val.counter	0-s32max
PARAM_VALUE	0	dev->priv->dev->card_data.hydra.transid	0-255
PARAM_VALUE	0	dev->priv->rocker->cmd_ring.head	0-4294967295
PARAM_VALUE	0	dev->rtnl_link_ops->alloc	0,1182153660833808384,3130032447137456128
PARAM_VALUE	0	dev->rtnl_link_ops->get_num_rx_queues	0,1694260139628544000,4559208055891021824,7097615251001798656,8443738062496038912
PARAM_VALUE	0	dev->rtnl_link_ops->get_num_tx_queues	0,1694260139628544000,4559208055891021824,7071371917186535424,8443738062496038912
PARAM_VALUE	0	dev->rtnl_link_ops->maxtype	0-6,8-10,15,18,20,22,24,34,50
PARAM_VALUE	0	dev->rtnl_link_ops->peer_type	0-1
PARAM_VALUE	0	dev->rtnl_link_ops->priv_size	0,8,32,40,48,56,88,112,120,144,160,224,240,256,296,616,624,728,744,1056,1128,1336,1616,2176,2240,2272,2560,3296,3552,9688-u64max
PARAM_VALUE	0	dev->rtnl_link_ops->setup	0,4096-ptr_max
PARAM_VALUE	0	dev->rtnl_link_ops->validate	0,4096-ptr_max
PARAM_VALUE	0	dev->up	1
PARAM_VALUE	0	dev->watchdog_dev_tracker	0,4096-ptr_max
PARAM_VALUE	0	dev->watchdog_lock.rlock.dep_map->name	0-255
PARAM_VALUE	0	dev->watchdog_ref_held	1
PARAM_VALUE	0	dev->watchdog_timeo	1-s32max
PARAM_VALUE	0	dev->watchdog_timer->entry.pprev	4096-ptr_max
PARAM_VALUE	0	dev->watchdog_timer.entry->pprev	4096-ptr_max
PARAM_VALUE	0	dev->watchdog_timer.entry.pprev	0,4096-ptr_max
PARAM_VALUE	0	dev->work_node.next->prev	4096-ptr_max
PARAM_VALUE	0	dev->work_node.prev	4074011205511094272
PARAM_VALUE	0	dev->work_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	0	dev->work_tracker->dead	0-1
PARAM_VALUE	0	dev->work_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	0	*dev->name	0-255
BUF_SIZE	0	dev->nd_net.net	(-1),10304,10432
CAPPED_DATA	0	dev->nd_net.net	1
DATA_SOURCE	0	dev	$1
NOSPEC	0	dev->flags
NOSPEC	0	dev->ifindex
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
USER_DATA	0	dev->flags	0-527362[c]
USER_DATA	0	dev->ifindex	0-s32max[c]
USER_DATA	0	dev->mtu	0-s32max[c]
NO_OVERFLOW_SIMPLE	0	dev->group
NO_OVERFLOW_SIMPLE	0	dev->tx_queue_len
LOCK2		global &rtnl_mutex
HALF_LOCKED2		&net->xfrm.xfrm_cfg_mutex
HALF_LOCKED2		global &audit_cmd_mutex.lock
HALF_LOCKED2		global &cb_lock
HALF_LOCKED2		global &crypto_cfg_mutex
HALF_LOCKED2		global &hwsim_phys_lock
HALF_LOCKED2		global &rx_queue_mutex

net/ipv4/devinet.c devinet_sysctl_forward() -> dev_disable_lro()

Type	Parameter	Key
NS_CAPABLE	0	12
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
LOCK2		&net->rtnl_mutex
LOCK2		global &rtnl_mutex
HALF_LOCKED2		&pool->lock
TYPE_LOCK		(struct net)->rtnl_mutex

net/ipv4/devinet.c inet_forward_change() -> dev_disable_lro()

Type	Parameter	Key	Value
PARAM_VALUE	0	dev	4096-ptr_max
CAPPED_DATA	0	&dev->dev_list	1
NS_CAPABLE	0	12
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
LOCK2		&net->rtnl_mutex
LOCK2		global &rtnl_mutex
HALF_LOCKED2		&pool->lock
TYPE_LOCK		(struct net)->rtnl_mutex