Commit 6cbe7210 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'ibmvnic-Fix-reset-work-item-locking-bugs' 



Thomas Falcon says:

====================
net/ibmvnic: Fix reset work item locking bugs

This patch set fixes issues with scheduling reset work items in
a tasklet context. Since ibmvnic_reset can called in an interrupt,
it should not use a mutex or allocate memory non-atomically.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 5648451e 1d1bbc37

drivers/net/ethernet/ibm/ibmvnic.c

+10 −8
Original line number Diff line number Diff line
@@ -1939,8 +1939,9 @@ static int do_hard_reset(struct ibmvnic_adapter *adapter, 
static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)

{

	struct ibmvnic_rwi *rwi;

	unsigned long flags;



	mutex_lock(&adapter->rwi_lock);

	spin_lock_irqsave(&adapter->rwi_lock, flags);



	if (!list_empty(&adapter->rwi_list)) {

		rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
@@ -1950,7 +1951,7 @@ static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter) 
		rwi = NULL;

	}



	mutex_unlock(&adapter->rwi_lock);

	spin_unlock_irqrestore(&adapter->rwi_lock, flags);

	return rwi;

}
@@ -2025,6 +2026,7 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter, 
	struct list_head *entry, *tmp_entry;

	struct ibmvnic_rwi *rwi, *tmp;

	struct net_device *netdev = adapter->netdev;

	unsigned long flags;

	int ret;



	if (adapter->state == VNIC_REMOVING ||
@@ -2041,21 +2043,21 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter, 
		goto err;

	}



	mutex_lock(&adapter->rwi_lock);

	spin_lock_irqsave(&adapter->rwi_lock, flags);



	list_for_each(entry, &adapter->rwi_list) {

		tmp = list_entry(entry, struct ibmvnic_rwi, list);

		if (tmp->reset_reason == reason) {

			netdev_dbg(netdev, "Skipping matching reset\n");

			mutex_unlock(&adapter->rwi_lock);

			spin_unlock_irqrestore(&adapter->rwi_lock, flags);

			ret = EBUSY;

			goto err;

		}

	}



	rwi = kzalloc(sizeof(*rwi), GFP_KERNEL);

	rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);

	if (!rwi) {

		mutex_unlock(&adapter->rwi_lock);

		spin_unlock_irqrestore(&adapter->rwi_lock, flags);

		ibmvnic_close(netdev);

		ret = ENOMEM;

		goto err;
@@ -2069,7 +2071,7 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter, 
	}

	rwi->reset_reason = reason;

	list_add_tail(&rwi->list, &adapter->rwi_list);

	mutex_unlock(&adapter->rwi_lock);

	spin_unlock_irqrestore(&adapter->rwi_lock, flags);

	adapter->resetting = true;

	netdev_dbg(adapter->netdev, "Scheduling reset (reason %d)\n", reason);

	schedule_work(&adapter->ibmvnic_reset);
@@ -4759,7 +4761,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id) 


	INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);

	INIT_LIST_HEAD(&adapter->rwi_list);

	mutex_init(&adapter->rwi_lock);

	spin_lock_init(&adapter->rwi_lock);

	adapter->resetting = false;



	adapter->mac_change_pending = false;

drivers/net/ethernet/ibm/ibmvnic.h

+1 −1
Original line number Diff line number Diff line
@@ -1075,7 +1075,7 @@ struct ibmvnic_adapter { 
	struct tasklet_struct tasklet;

	enum vnic_state state;

	enum ibmvnic_reset_reason reset_reason;

	struct mutex rwi_lock;

	spinlock_t rwi_lock;

	struct list_head rwi_list;

	struct work_struct ibmvnic_reset;

	bool resetting;