/**
* usb_serial_generic_write_start - kick off an URB write
* @port: Pointer to the &struct usb_serial_port data
*
* Returns zero on success, or a negative errno value
*/
static int usb_serial_generic_write_start(struct usb_serial_port *port)
{
struct urb *urb;
int count, result;
unsigned long flags;
int i;
if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags))
return 0;
retry:
spin_lock_irqsave(&port->lock, flags);
if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) {
clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
spin_unlock_irqrestore(&port->lock, flags);
return 0;
}
i = (int)find_first_bit(&port->write_urbs_free,
ARRAY_SIZE(port->write_urbs));
spin_unlock_irqrestore(&port->lock, flags);
urb = port->write_urbs[i];
count = port->serial->type->prepare_write_buffer(port,
urb->transfer_buffer,
port->bulk_out_size);
urb->transfer_buffer_length = count;
usb_serial_debug_data(debug, &port->dev, __func__, count,
urb->transfer_buffer);
spin_lock_irqsave(&port->lock, flags);
port->tx_bytes += count;
spin_unlock_irqrestore(&port->lock, flags);
clear_bit(i, &port->write_urbs_free);
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result) {
dev_err(&port->dev, "%s - error submitting urb: %d\n",
__func__, result);
set_bit(i, &port->write_urbs_free);
spin_lock_irqsave(&port->lock, flags);
port->tx_bytes -= count;
spin_unlock_irqrestore(&port->lock, flags);
clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
return result;
}
/* Try sending off another urb, unless in irq context (in which case
* there will be no free urb). */
if (!in_irq())
goto retry;
clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
return 0;
}
/**
* unlock_page - unlock a locked page
* @page: the page
*
* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().
* Also wakes sleepers in wait_on_page_writeback() because the wakeup
* mechanism between PageLocked pages and PageWriteback pages is shared.
* But that's OK - sleepers in wait_on_page_writeback() just go back to sleep.
*
* The mb is necessary to enforce ordering between the clear_bit and the read
* of the waitqueue (to avoid SMP races with a parallel wait_on_page_locked()).
*/
void unlock_page(struct page *page)
{
VM_BUG_ON_PAGE(!PageLocked(page), page);
clear_bit_unlock(PG_locked, &page->flags);
smp_mb__after_atomic();
wake_up_page(page, PG_locked);
}
static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
__u16 *val)
{
struct usb_device *dev = mcs->port->serial->dev;
struct usb_ctrlrequest *dr = mcs->dr;
unsigned char *buffer = mcs->ctrl_buf;
int ret;
if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
return -EBUSY;
dr->bRequestType = MCS_RD_RTYPE;
dr->bRequest = MCS_RDREQ;
dr->wValue = cpu_to_le16(Wval); /* 0 */
dr->wIndex = cpu_to_le16(reg);
dr->wLength = cpu_to_le16(2);
usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
(unsigned char *)dr, buffer, 2,
mos7840_control_callback, mcs);
mcs->control_urb->transfer_buffer_length = 2;
ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
if (ret)
clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
return ret;
}
/**
* i40e_ptp_tx_hwtstamp - Utility function which returns the Tx timestamp
* @pf: Board private structure
*
* Read the value of the Tx timestamp from the registers, convert it into a
* value consumable by the stack, and store that result into the shhwtstamps
* struct before returning it up the stack.
**/
void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf)
{
struct skb_shared_hwtstamps shhwtstamps;
struct i40e_hw *hw = &pf->hw;
u32 hi, lo;
u64 ns;
if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx)
return;
/* don't attempt to timestamp if we don't have an skb */
if (!pf->ptp_tx_skb)
return;
lo = rd32(hw, I40E_PRTTSYN_TXTIME_L);
hi = rd32(hw, I40E_PRTTSYN_TXTIME_H);
ns = (((u64)hi) << 32) | lo;
i40e_ptp_convert_to_hwtstamp(&shhwtstamps, ns);
skb_tstamp_tx(pf->ptp_tx_skb, &shhwtstamps);
dev_kfree_skb_any(pf->ptp_tx_skb);
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, &pf->state);
}
static void put_tag(struct nullb_queue *nq, unsigned int tag)
{
clear_bit_unlock(tag, nq->tag_map);
if (waitqueue_active(&nq->wait))
wake_up(&nq->wait);
}
static void escvp_get_rdlen_callback(struct urb *urb)
{
__u16 *data;
__u16 rdlen = 0x0000;
int len;
struct escvp_port *vport;
struct device *dev = &urb->dev->dev;
int status = urb->status;
vport = urb->context;
switch (status) {
case 0:
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
dev_dbg(dev, "%s - urb shutting down with status : %d\n", __func__, status);
goto out;
default:
dev_dbg(dev, "%s - nonzero urb status received: %dn", __func__, status);
goto out;
}
data = urb->transfer_buffer;
rdlen = data[0];
len = (int)rdlen;
out:
clear_bit_unlock(ESCVP_FLAG_CTRL_BUSY, &vport->flags);
if(rdlen != 0x0000){
escvp_get_rd(vport,rdlen);
}
}
/**
* blk_queue_end_tag - end tag operations for a request
* @q: the request queue for the device
* @rq: the request that has completed
*
* Description:
* Typically called when end_that_request_first() returns %0, meaning
* all transfers have been done for a request. It's important to call
* this function before end_that_request_last(), as that will put the
* request back on the free list thus corrupting the internal tag list.
*
* Notes:
* queue lock must be held.
**/
void blk_queue_end_tag(struct request_queue *q, struct request *rq)
{
struct blk_queue_tag *bqt = q->queue_tags;
int tag = rq->tag;
BUG_ON(tag == -1);
if (unlikely(tag >= bqt->real_max_depth))
/*
* This can happen after tag depth has been reduced.
* FIXME: how about a warning or info message here?
*/
return;
list_del_init(&rq->queuelist);
rq->cmd_flags &= ~REQ_QUEUED;
rq->tag = -1;
if (unlikely(bqt->tag_index[tag] == NULL))
printk(KERN_ERR "%s: tag %d is missing\n",
__func__, tag);
bqt->tag_index[tag] = NULL;
if (unlikely(!test_bit(tag, bqt->tag_map))) {
printk(KERN_ERR "%s: attempt to clear non-busy tag (%d)\n",
__func__, tag);
return;
}
/*
* The tag_map bit acts as a lock for tag_index[bit], so we need
* unlock memory barrier semantics.
*/
clear_bit_unlock(tag, bqt->tag_map);
}
int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
unsigned long *bitlock = &NFS_I(inode)->flags;
struct nfs_pageio_descriptor pgio;
int err;
/* Stop dirtying of new pages while we sync */
err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
nfs_wait_bit_killable, TASK_KILLABLE);
if (err)
goto out_err;
nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
nfs_pageio_complete(&pgio);
clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
smp_mb__after_clear_bit();
wake_up_bit(bitlock, NFS_INO_FLUSHING);
if (err < 0)
goto out_err;
err = pgio.pg_error;
if (err < 0)
goto out_err;
return 0;
out_err:
return err;
}
/**
* i40e_ptp_tx_hang - Detect error case when Tx timestamp register is hung
* @pf: The PF private data structure
*
* This watchdog task is run periodically to make sure that we clear the Tx
* timestamp logic if we don't obtain a timestamp in a reasonable amount of
* time. It is unexpected in the normal case but if it occurs it results in
* permanently preventing timestamps of future packets.
**/
void i40e_ptp_tx_hang(struct i40e_pf *pf)
{
struct sk_buff *skb;
if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx)
return;
/* Nothing to do if we're not already waiting for a timestamp */
if (!test_bit(__I40E_PTP_TX_IN_PROGRESS, pf->state))
return;
/* We already have a handler routine which is run when we are notified
* of a Tx timestamp in the hardware. If we don't get an interrupt
* within a second it is reasonable to assume that we never will.
*/
if (time_is_before_jiffies(pf->ptp_tx_start + HZ)) {
skb = pf->ptp_tx_skb;
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
/* Free the skb after we clear the bitlock */
dev_kfree_skb_any(skb);
pf->tx_hwtstamp_timeouts++;
}
}
/**
* igb_ptp_tx_work
* @work: pointer to work struct
*
* This work function polls the TSYNCTXCTL valid bit to determine when a
* timestamp has been taken for the current stored skb.
**/
static void igb_ptp_tx_work(struct work_struct *work)
{
struct igb_adapter *adapter = container_of(work, struct igb_adapter,
ptp_tx_work);
struct e1000_hw *hw = &adapter->hw;
u32 tsynctxctl;
if (!adapter->ptp_tx_skb)
return;
if (time_is_before_jiffies(adapter->ptp_tx_start +
IGB_PTP_TX_TIMEOUT)) {
dev_kfree_skb_any(adapter->ptp_tx_skb);
adapter->ptp_tx_skb = NULL;
clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
adapter->tx_hwtstamp_timeouts++;
dev_warn(&adapter->pdev->dev, "clearing Tx timestamp hang\n");
return;
}
tsynctxctl = rd32(E1000_TSYNCTXCTL);
if (tsynctxctl & E1000_TSYNCTXCTL_VALID)
igb_ptp_tx_hwtstamp(adapter);
else
/* reschedule to check later */
schedule_work(&adapter->ptp_tx_work);
}
/**
* igb_ptp_tx_hwtstamp - utility function which checks for TX time stamp
* @adapter: Board private structure.
*
* If we were asked to do hardware stamping and such a time stamp is
* available, then it must have been for this skb here because we only
* allow only one such packet into the queue.
**/
static void igb_ptp_tx_hwtstamp(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
struct skb_shared_hwtstamps shhwtstamps;
u64 regval;
int adjust = 0;
regval = rd32(E1000_TXSTMPL);
regval |= (u64)rd32(E1000_TXSTMPH) << 32;
igb_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval);
/* adjust timestamp for the TX latency based on link speed */
if (adapter->hw.mac.type == e1000_i210) {
switch (adapter->link_speed) {
case SPEED_10:
adjust = IGB_I210_TX_LATENCY_10;
break;
case SPEED_100:
adjust = IGB_I210_TX_LATENCY_100;
break;
case SPEED_1000:
adjust = IGB_I210_TX_LATENCY_1000;
break;
}
}
shhwtstamps.hwtstamp = ktime_sub_ns(shhwtstamps.hwtstamp, adjust);
skb_tstamp_tx(adapter->ptp_tx_skb, &shhwtstamps);
dev_kfree_skb_any(adapter->ptp_tx_skb);
adapter->ptp_tx_skb = NULL;
clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
}
/**
* igb_ptp_stop - Disable PTP device and stop the overflow check.
* @adapter: Board private structure.
*
* This function stops the PTP support and cancels the delayed work.
**/
void igb_ptp_stop(struct igb_adapter *adapter)
{
switch (adapter->hw.mac.type) {
case e1000_82576:
case e1000_82580:
case e1000_i354:
case e1000_i350:
cancel_delayed_work_sync(&adapter->ptp_overflow_work);
break;
case e1000_i210:
case e1000_i211:
/* No delayed work to cancel. */
break;
default:
return;
}
cancel_work_sync(&adapter->ptp_tx_work);
if (adapter->ptp_tx_skb) {
dev_kfree_skb_any(adapter->ptp_tx_skb);
adapter->ptp_tx_skb = NULL;
clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
}
if (adapter->ptp_clock) {
ptp_clock_unregister(adapter->ptp_clock);
dev_info(&adapter->pdev->dev, "removed PHC on %s\n",
adapter->netdev->name);
adapter->flags &= ~IGB_FLAG_PTP;
}
}
/**
* i40e_ptp_tx_hwtstamp - Utility function which returns the Tx timestamp
* @pf: Board private structure
*
* Read the value of the Tx timestamp from the registers, convert it into a
* value consumable by the stack, and store that result into the shhwtstamps
* struct before returning it up the stack.
**/
void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf)
{
struct skb_shared_hwtstamps shhwtstamps;
struct sk_buff *skb = pf->ptp_tx_skb;
struct i40e_hw *hw = &pf->hw;
u32 hi, lo;
u64 ns;
if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx)
return;
/* don't attempt to timestamp if we don't have an skb */
if (!pf->ptp_tx_skb)
return;
lo = rd32(hw, I40E_PRTTSYN_TXTIME_L);
hi = rd32(hw, I40E_PRTTSYN_TXTIME_H);
ns = (((u64)hi) << 32) | lo;
i40e_ptp_convert_to_hwtstamp(&shhwtstamps, ns);
/* Clear the bit lock as soon as possible after reading the register,
* and prior to notifying the stack via skb_tstamp_tx(). Otherwise
* applications might wake up and attempt to request another transmit
* timestamp prior to the bit lock being cleared.
*/
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
/* Notify the stack and free the skb after we've unlocked */
skb_tstamp_tx(skb, &shhwtstamps);
dev_kfree_skb_any(skb);
}
/**
* blk_queue_end_tag - end tag operations for a request
* @q: the request queue for the device
* @rq: the request that has completed
*
* Description:
* Typically called when end_that_request_first() returns %0, meaning
* all transfers have been done for a request. It's important to call
* this function before end_that_request_last(), as that will put the
* request back on the free list thus corrupting the internal tag list.
*
* Notes:
* queue lock must be held.
**/
void blk_queue_end_tag(struct request_queue *q, struct request *rq)
{
struct blk_queue_tag *bqt = q->queue_tags;
unsigned tag = rq->tag; /* negative tags invalid */
BUG_ON(tag >= bqt->real_max_depth);
list_del_init(&rq->queuelist);
rq->cmd_flags &= ~REQ_QUEUED;
rq->tag = -1;
if (unlikely(bqt->tag_index[tag] == NULL))
printk(KERN_ERR "%s: tag %d is missing\n",
__func__, tag);
bqt->tag_index[tag] = NULL;
if (unlikely(!test_bit(tag, bqt->tag_map))) {
printk(KERN_ERR "%s: attempt to clear non-busy tag (%d)\n",
__func__, tag);
return;
}
/*
* The tag_map bit acts as a lock for tag_index[bit], so we need
* unlock memory barrier semantics.
*/
clear_bit_unlock(tag, bqt->tag_map);
}
int gfar_set_features(struct net_device *dev, netdev_features_t features)
{
netdev_features_t changed = dev->features ^ features;
struct gfar_private *priv = netdev_priv(dev);
int err = 0;
if (!(changed & (NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_RXCSUM)))
return 0;
while (test_and_set_bit_lock(GFAR_RESETTING, &priv->state))
cpu_relax();
dev->features = features;
if (dev->flags & IFF_UP) {
/* Now we take down the rings to rebuild them */
stop_gfar(dev);
err = startup_gfar(dev);
} else {
gfar_mac_reset(priv);
}
clear_bit_unlock(GFAR_RESETTING, &priv->state);
return err;
}
/**
* usb_serial_generic_write_start - start writing buffered data
* @port: usb-serial port
* @mem_flags: flags to use for memory allocations
*
* Serialised using USB_SERIAL_WRITE_BUSY flag.
*
* Return: Zero on success or if busy, otherwise a negative errno value.
*/
int usb_serial_generic_write_start(struct usb_serial_port *port,
gfp_t mem_flags)
{
struct urb *urb;
int count, result;
unsigned long flags;
int i;
if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags))
return 0;
retry:
spin_lock_irqsave(&port->lock, flags);
if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) {
clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
spin_unlock_irqrestore(&port->lock, flags);
return 0;
}
i = (int)find_first_bit(&port->write_urbs_free,
ARRAY_SIZE(port->write_urbs));
spin_unlock_irqrestore(&port->lock, flags);
urb = port->write_urbs[i];
count = port->serial->type->prepare_write_buffer(port,
urb->transfer_buffer,
port->bulk_out_size);
urb->transfer_buffer_length = count;
usb_serial_debug_data(&port->dev, __func__, count, urb->transfer_buffer);
spin_lock_irqsave(&port->lock, flags);
port->tx_bytes += count;
spin_unlock_irqrestore(&port->lock, flags);
clear_bit(i, &port->write_urbs_free);
result = usb_submit_urb(urb, mem_flags);
if (result) {
dev_err_console(port, "%s - error submitting urb: %d\n",
__func__, result);
set_bit(i, &port->write_urbs_free);
spin_lock_irqsave(&port->lock, flags);
port->tx_bytes -= count;
spin_unlock_irqrestore(&port->lock, flags);
clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
return result;
}
goto retry; /* try sending off another urb */
}
int
release_pmu(struct platform_device *pdev)
{
if (WARN_ON(pdev != pmu_devices[pdev->id]))
return -EINVAL;
clear_bit_unlock(pdev->id, &pmu_lock);
return 0;
}
static inline void ide_unlock_host(struct ide_host *host)
{
if (host->host_flags & IDE_HFLAG_SERIALIZE) {
/* for atari only */
ide_release_lock();
clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy);
}
}
int
release_pmu(enum arm_pmu_type type)
{
if (WARN_ON(!pmu_devices[type]))
return -EINVAL;
clear_bit_unlock(type, &pmu_lock);
return 0;
}
static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
{
if (!ip)
return;
clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
}
static bool afs_vl_probe_done(struct afs_vlserver *server)
{
if (!atomic_dec_and_test(&server->probe_outstanding))
return false;
wake_up_var(&server->probe_outstanding);
clear_bit_unlock(AFS_VLSERVER_FL_PROBING, &server->flags);
wake_up_bit(&server->flags, AFS_VLSERVER_FL_PROBING);
return true;
}
/*
* When raise() is called it will be passed a pointer to the
* backtrace_mask. Architectures that call nmi_cpu_backtrace()
* directly from their raise() functions may rely on the mask
* they are passed being updated as a side effect of this call.
*/
void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
bool exclude_self,
void (*raise)(cpumask_t *mask))
{
int i, this_cpu = get_cpu();
if (test_and_set_bit(0, &backtrace_flag)) {
/*
* If there is already a trigger_all_cpu_backtrace() in progress
* (backtrace_flag == 1), don't output double cpu dump infos.
*/
put_cpu();
return;
}
cpumask_copy(to_cpumask(backtrace_mask), mask);
if (exclude_self)
cpumask_clear_cpu(this_cpu, to_cpumask(backtrace_mask));
/*
* Don't try to send an NMI to this cpu; it may work on some
* architectures, but on others it may not, and we'll get
* information at least as useful just by doing a dump_stack() here.
* Note that nmi_cpu_backtrace(NULL) will clear the cpu bit.
*/
if (cpumask_test_cpu(this_cpu, to_cpumask(backtrace_mask)))
nmi_cpu_backtrace(NULL);
if (!cpumask_empty(to_cpumask(backtrace_mask))) {
pr_info("Sending NMI from CPU %d to CPUs %*pbl:\n",
this_cpu, nr_cpumask_bits, to_cpumask(backtrace_mask));
raise(to_cpumask(backtrace_mask));
}
/* Wait for up to 10 seconds for all CPUs to do the backtrace */
for (i = 0; i < 10 * 1000; i++) {
if (cpumask_empty(to_cpumask(backtrace_mask)))
break;
mdelay(1);
touch_softlockup_watchdog();
}
/*
* Force flush any remote buffers that might be stuck in IRQ context
* and therefore could not run their irq_work.
*/
printk_nmi_flush();
clear_bit_unlock(0, &backtrace_flag);
put_cpu();
}
/**
* igb_ptp_tx_hwtstamp - utility function which checks for TX time stamp
* @adapter: Board private structure.
*
* If we were asked to do hardware stamping and such a time stamp is
* available, then it must have been for this skb here because we only
* allow only one such packet into the queue.
**/
static void igb_ptp_tx_hwtstamp(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
struct skb_shared_hwtstamps shhwtstamps;
u64 regval;
regval = rd32(E1000_TXSTMPL);
regval |= (u64)rd32(E1000_TXSTMPH) << 32;
igb_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval);
skb_tstamp_tx(adapter->ptp_tx_skb, &shhwtstamps);
dev_kfree_skb_any(adapter->ptp_tx_skb);
adapter->ptp_tx_skb = NULL;
clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
}
/**
* igb_ptp_suspend - Disable PTP work items and prepare for suspend
* @adapter: Board private structure
*
* This function stops the overflow check work and PTP Tx timestamp work, and
* will prepare the device for OS suspend.
*/
void igb_ptp_suspend(struct igb_adapter *adapter)
{
if (!(adapter->ptp_flags & IGB_PTP_ENABLED))
return;
if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
cancel_delayed_work_sync(&adapter->ptp_overflow_work);
cancel_work_sync(&adapter->ptp_tx_work);
if (adapter->ptp_tx_skb) {
dev_kfree_skb_any(adapter->ptp_tx_skb);
adapter->ptp_tx_skb = NULL;
clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
}
}
/**
* bearer_disable
*
* Note: This routine assumes caller holds RTNL lock.
*/
static void bearer_disable(struct net *net, struct tipc_bearer *b)
{
struct tipc_net *tn = tipc_net(net);
int bearer_id = b->identity;
pr_info("Disabling bearer <%s>\n", b->name);
clear_bit_unlock(0, &b->up);
tipc_node_delete_links(net, bearer_id);
b->media->disable_media(b);
RCU_INIT_POINTER(b->media_ptr, NULL);
if (b->disc)
tipc_disc_delete(b->disc);
RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
kfree_rcu(b, rcu);
tipc_mon_delete(net, bearer_id);
}
struct platform_device *
reserve_pmu(enum arm_pmu_type device)
{
struct platform_device *pdev;
if (test_and_set_bit_lock(device, &pmu_lock)) {
pdev = ERR_PTR(-EBUSY);
} else if (pmu_devices[device] == NULL) {
clear_bit_unlock(device, &pmu_lock);
pdev = ERR_PTR(-ENODEV);
} else {
pdev = pmu_devices[device];
}
return pdev;
}
/**
* i40e_ptp_tx_hwtstamp - Utility function which returns the Tx timestamp
* @pf: Board private structure
*
* Read the value of the Tx timestamp from the registers, convert it into a
* value consumable by the stack, and store that result into the shhwtstamps
* struct before returning it up the stack.
**/
void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf)
{
struct skb_shared_hwtstamps shhwtstamps;
struct i40e_hw *hw = &pf->hw;
u32 hi, lo;
u64 ns;
lo = rd32(hw, I40E_PRTTSYN_TXTIME_L);
hi = rd32(hw, I40E_PRTTSYN_TXTIME_H);
ns = (((u64)hi) << 32) | lo;
i40e_ptp_convert_to_hwtstamp(&shhwtstamps, ns);
skb_tstamp_tx(pf->ptp_tx_skb, &shhwtstamps);
dev_kfree_skb_any(pf->ptp_tx_skb);
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, &pf->state);
}
/* Change the current ring parameters, stopping the controller if
* necessary so that we don't mess things up while we're in motion.
*/
static int gfar_sringparam(struct net_device *dev,
struct ethtool_ringparam *rvals)
{
struct gfar_private *priv = netdev_priv(dev);
int err = 0, i;
if (rvals->rx_pending > GFAR_RX_MAX_RING_SIZE)
return -EINVAL;
if (!is_power_of_2(rvals->rx_pending)) {
netdev_err(dev, "Ring sizes must be a power of 2\n");
return -EINVAL;
}
if (rvals->tx_pending > GFAR_TX_MAX_RING_SIZE)
return -EINVAL;
if (!is_power_of_2(rvals->tx_pending)) {
netdev_err(dev, "Ring sizes must be a power of 2\n");
return -EINVAL;
}
while (test_and_set_bit_lock(GFAR_RESETTING, &priv->state))
cpu_relax();
if (dev->flags & IFF_UP)
stop_gfar(dev);
/* Change the sizes */
for (i = 0; i < priv->num_rx_queues; i++)
priv->rx_queue[i]->rx_ring_size = rvals->rx_pending;
for (i = 0; i < priv->num_tx_queues; i++)
priv->tx_queue[i]->tx_ring_size = rvals->tx_pending;
/* Rebuild the rings with the new size */
if (dev->flags & IFF_UP)
err = startup_gfar(dev);
clear_bit_unlock(GFAR_RESETTING, &priv->state);
return err;
}
/**
* i40e_ptp_stop - Disable the driver/hardware support and unregister the PHC
* @pf: Board private structure
*
* This function handles the cleanup work required from the initialization by
* clearing out the important information and unregistering the PHC.
**/
void i40e_ptp_stop(struct i40e_pf *pf)
{
pf->flags &= ~I40E_FLAG_PTP;
pf->ptp_tx = false;
pf->ptp_rx = false;
if (pf->ptp_tx_skb) {
dev_kfree_skb_any(pf->ptp_tx_skb);
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, &pf->state);
}
if (pf->ptp_clock) {
ptp_clock_unregister(pf->ptp_clock);
pf->ptp_clock = NULL;
dev_info(&pf->pdev->dev, "%s: removed PHC on %s\n", __func__,
pf->vsi[pf->lan_vsi]->netdev->name);
}
}
/**
* fscache_object_lookup_negative - Note negative cookie lookup
* @object: Object pointing to cookie to mark
*
* Note negative lookup, permitting those waiting to read data from an already
* existing backing object to continue as there's no data for them to read.
*/
void fscache_object_lookup_negative(struct fscache_object *object)
{
struct fscache_cookie *cookie = object->cookie;
_enter("{OBJ%x,%s}", object->debug_id, object->state->name);
if (!test_and_set_bit(FSCACHE_OBJECT_IS_LOOKED_UP, &object->flags)) {
fscache_stat(&fscache_n_object_lookups_negative);
/* Allow write requests to begin stacking up and read requests to begin
* returning ENODATA.
*/
set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
clear_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
_debug("wake up lookup %p", &cookie->flags);
clear_bit_unlock(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
}
_leave("");
}
