mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 13:53:33 +00:00
Code Issues Releases Wiki Activity

net/ibmvnic: prevent more than one thread from running in reset

Browse source 
The current code allows more than one thread to run in reset. This can
corrupt struct adapter data. Check adapter->resetting before performing
a reset, if there is another reset running delay (100 msec) before trying
again.

Signed-off-by: Juliet Kim <julietk@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Juliet Kim 2019-09-20 16:11:23 -04:00 committed by David S. Miller
parent b27507bb59
commit 7ed5b31f4a
2 changed files with 34 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

40
drivers/net/ethernet/ibm/ibmvnic.c
View file

@ -1207,7 +1207,7 @@ static void ibmvnic_cleanup(struct net_device *netdev)
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
/* ensure that transmissions are stopped if called by do_reset */
if (adapter->resetting)
if (test_bit(0, &adapter->resetting))
netif_tx_disable(netdev);
else
netif_tx_stop_all_queues(netdev);
@ -1428,7 +1428,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
u8 proto = 0;
netdev_tx_t ret = NETDEV_TX_OK;
if (adapter->resetting) {
if (test_bit(0, &adapter->resetting)) {
if (!netif_subqueue_stopped(netdev, skb))
netif_stop_subqueue(netdev, queue_num);
dev_kfree_skb_any(skb);
@ -2054,6 +2054,12 @@ static void __ibmvnic_reset(struct work_struct *work)
adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
if (test_and_set_bit_lock(0, &adapter->resetting)) {
schedule_delayed_work(&adapter->ibmvnic_delayed_reset,
IBMVNIC_RESET_DELAY);
return;
}
reset_state = adapter->state;
rwi = get_next_rwi(adapter);
@ -2095,6 +2101,10 @@ static void __ibmvnic_reset(struct work_struct *work)
break;
rwi = get_next_rwi(adapter);
if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
rwi->reset_reason == VNIC_RESET_MOBILITY))
adapter->force_reset_recovery = true;
}
if (adapter->wait_for_reset) {
@ -2107,7 +2117,16 @@ static void __ibmvnic_reset(struct work_struct *work)
free_all_rwi(adapter);
}
adapter->resetting = false;
clear_bit_unlock(0, &adapter->resetting);
}
static void __ibmvnic_delayed_reset(struct work_struct *work)
{
struct ibmvnic_adapter *adapter;
adapter = container_of(work, struct ibmvnic_adapter,
ibmvnic_delayed_reset.work);
__ibmvnic_reset(&adapter->ibmvnic_reset);
}
static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
@ -2162,7 +2181,6 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
rwi->reset_reason = reason;
list_add_tail(&rwi->list, &adapter->rwi_list);
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);
@ -2207,7 +2225,7 @@ static int ibmvnic_poll(struct napi_struct *napi, int budget)
u16 offset;
u8 flags = 0;
if (unlikely(adapter->resetting &&
if (unlikely(test_bit(0, &adapter->resetting) &&
adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
enable_scrq_irq(adapter, adapter->rx_scrq[scrq_num]);
napi_complete_done(napi, frames_processed);
@ -2858,7 +2876,7 @@ static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
return 1;
}
if (adapter->resetting &&
if (test_bit(0, &adapter->resetting) &&
adapter->reset_reason == VNIC_RESET_MOBILITY) {
u64 val = (0xff000000) | scrq->hw_irq;
@ -3408,7 +3426,7 @@ static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
if (rc) {
if (rc == H_CLOSED) {
dev_warn(dev, "CRQ Queue closed\n");
if (adapter->resetting)
if (test_bit(0, &adapter->resetting))
ibmvnic_reset(adapter, VNIC_RESET_FATAL);
}
@ -4484,7 +4502,7 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
case IBMVNIC_CRQ_XPORT_EVENT:
netif_carrier_off(netdev);
adapter->crq.active = false;
if (adapter->resetting)
if (test_bit(0, &adapter->resetting))
adapter->force_reset_recovery = true;
if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
dev_info(dev, "Migrated, re-enabling adapter\n");
@ -4822,7 +4840,7 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter)
return -1;
}
if (adapter->resetting && !adapter->wait_for_reset &&
if (test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
adapter->reset_reason != VNIC_RESET_MOBILITY) {
if (adapter->req_rx_queues != old_num_rx_queues ||
adapter->req_tx_queues != old_num_tx_queues) {
@ -4934,10 +4952,12 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
spin_lock_init(&adapter->stats_lock);
INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
__ibmvnic_delayed_reset);
INIT_LIST_HEAD(&adapter->rwi_list);
spin_lock_init(&adapter->rwi_lock);
init_completion(&adapter->init_done);
adapter->resetting = false;
clear_bit(0, &adapter->resetting);
do {
rc = init_crq_queue(adapter);

5
drivers/net/ethernet/ibm/ibmvnic.h
View file

@ -39,6 +39,8 @@
#define IBMVNIC_MAX_LTB_SIZE ((1 << (MAX_ORDER - 1)) * PAGE_SIZE)
#define IBMVNIC_BUFFER_HLEN 500
#define IBMVNIC_RESET_DELAY 100
static const char ibmvnic_priv_flags[][ETH_GSTRING_LEN] = {
#define IBMVNIC_USE_SERVER_MAXES 0x1
"use-server-maxes"
@ -1077,7 +1079,8 @@ struct ibmvnic_adapter {
spinlock_t rwi_lock;
struct list_head rwi_list;
struct work_struct ibmvnic_reset;
bool resetting;
struct delayed_work ibmvnic_delayed_reset;
unsigned long resetting;
bool napi_enabled, from_passive_init;
bool failover_pending;