C++ spin_unlock_irq函数代码示例

unsigned long probe_irq_on(void)
{
	unsigned int i;
	irq_desc_t *desc;
	unsigned long val;
	unsigned long delay;

	down(&probe_sem);
	/* 
	 * something may have generated an irq long ago and we want to
	 * flush such a longstanding irq before considering it as spurious. 
	 */
	for (i = NR_IRQS-1; i > 0; i--)  {
		desc = irq_desc + i;

		spin_lock_irq(&desc->lock);
		if (!irq_desc[i].action) 
			irq_desc[i].handler->startup(i);
		spin_unlock_irq(&desc->lock);
	}

	/* Wait for longstanding interrupts to trigger. */
	for (delay = jiffies + HZ/50; time_after(delay, jiffies); )
		/* about 20ms delay */ synchronize_irq();

	/*
	 * enable any unassigned irqs
	 * (we must startup again here because if a longstanding irq
	 * happened in the previous stage, it may have masked itself)
	 */
	for (i = NR_IRQS-1; i > 0; i--) {
		desc = irq_desc + i;

		spin_lock_irq(&desc->lock);
		if (!desc->action) {
			desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
			if (desc->handler->startup(i))
				desc->status |= IRQ_PENDING;
		}
		spin_unlock_irq(&desc->lock);
	}

	/*
	 * Wait for spurious interrupts to trigger
	 */
	for (delay = jiffies + HZ/10; time_after(delay, jiffies); )
		/* about 100ms delay */ synchronize_irq();

	/*
	 * Now filter out any obviously spurious interrupts
	 */
	val = 0;
	for (i = 0; i < NR_IRQS; i++) {
		irq_desc_t *desc = irq_desc + i;
		unsigned int status;

		spin_lock_irq(&desc->lock);
		status = desc->status;

		if (status & IRQ_AUTODETECT) {
			/* It triggered already - consider it spurious. */
			if (!(status & IRQ_WAITING)) {
				desc->status = status & ~IRQ_AUTODETECT;
				desc->handler->shutdown(i);
			} else
				if (i < 32)
					val |= 1 << i;
		}
		spin_unlock_irq(&desc->lock);
	}

	return val;
}

int do_syslog(int type, char __user *buf, int len, bool from_file)
{
	unsigned i, j, limit, count;
	int do_clear = 0;
	char c;
	int error;

	error = check_syslog_permissions(type, from_file);
	if (error)
		goto out;

	error = security_syslog(type);
	if (error)
		return error;

	switch (type) {
	case SYSLOG_ACTION_CLOSE:	/* Close log */
		break;
	case SYSLOG_ACTION_OPEN:	/* Open log */
		break;
	case SYSLOG_ACTION_READ:	/* Read from log */
		error = -EINVAL;
		if (!buf || len < 0)
			goto out;
		error = 0;
		if (!len)
			goto out;
		if (!access_ok(VERIFY_WRITE, buf, len)) {
			error = -EFAULT;
			goto out;
		}
		error = wait_event_interruptible(log_wait,
							(log_start - log_end));
		if (error)
			goto out;
		i = 0;
		spin_lock_irq(&logbuf_lock);
		while (!error && (log_start != log_end) && i < len) {
			c = LOG_BUF(log_start);
			log_start++;
			spin_unlock_irq(&logbuf_lock);
			error = __put_user(c,buf);
			buf++;
			i++;
			cond_resched();
			spin_lock_irq(&logbuf_lock);
		}
		spin_unlock_irq(&logbuf_lock);
		if (!error)
			error = i;
		break;
	/* Read/clear last kernel messages */
	case SYSLOG_ACTION_READ_CLEAR:
		do_clear = 1;
		/* FALL THRU */
	/* Read last kernel messages */
	case SYSLOG_ACTION_READ_ALL:
		error = -EINVAL;
		if (!buf || len < 0)
			goto out;
		error = 0;
		if (!len)
			goto out;
		if (!access_ok(VERIFY_WRITE, buf, len)) {
			error = -EFAULT;
			goto out;
		}
		count = len;
		if (count > log_buf_len)
			count = log_buf_len;
		spin_lock_irq(&logbuf_lock);
		if (count > logged_chars)
			count = logged_chars;
		if (do_clear)
			logged_chars = 0;
		limit = log_end;
		/*
		 * __put_user() could sleep, and while we sleep
		 * printk() could overwrite the messages
		 * we try to copy to user space. Therefore
		 * the messages are copied in reverse. <manfreds>
		 */
		for (i = 0; i < count && !error; i++) {
			j = limit-1-i;
			if (j + log_buf_len < log_end)
				break;
			c = LOG_BUF(j);
			spin_unlock_irq(&logbuf_lock);
			error = __put_user(c,&buf[count-1-i]);
			cond_resched();
			spin_lock_irq(&logbuf_lock);
		}
		spin_unlock_irq(&logbuf_lock);
		if (error)
			break;
		error = i;
		if (i != count) {
			int offset = count-error;
			/* buffer overflow during copy, correct user buffer. */
			for (i = 0; i < error; i++) {
//.........这里部分代码省略.........

static void rtc_mrst_do_shutdown(void)
{
	spin_lock_irq(&rtc_lock);
	mrst_irq_disable(&mrst_rtc, RTC_IRQMASK);
	spin_unlock_irq(&rtc_lock);
}

/**
 * nilfs_btnode_prepare_change_key
 *  prepare to move contents of the block for old key to one of new key.
 *  the old buffer will not be removed, but might be reused for new buffer.
 *  it might return -ENOMEM because of memory allocation errors,
 *  and might return -EIO because of disk read errors.
 */
int nilfs_btnode_prepare_change_key(struct address_space *btnc,
				    struct nilfs_btnode_chkey_ctxt *ctxt)
{
	struct buffer_head *obh, *nbh;
	struct inode *inode = NILFS_BTNC_I(btnc);
	__u64 oldkey = ctxt->oldkey, newkey = ctxt->newkey;
	int err;

	if (oldkey == newkey)
		return 0;

	obh = ctxt->bh;
	ctxt->newbh = NULL;

	if (inode->i_blkbits == PAGE_CACHE_SHIFT) {
		lock_page(obh->b_page);
		/*
		 * We cannot call radix_tree_preload for the kernels older
		 * than 2.6.23, because it is not exported for modules.
		 */
retry:
		err = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
		if (err)
			goto failed_unlock;
		/* BUG_ON(oldkey != obh->b_page->index); */
		if (unlikely(oldkey != obh->b_page->index))
			NILFS_PAGE_BUG(obh->b_page,
				       "invalid oldkey %lld (newkey=%lld)",
				       (unsigned long long)oldkey,
				       (unsigned long long)newkey);

		spin_lock_irq(&btnc->tree_lock);
		err = radix_tree_insert(&btnc->page_tree, newkey, obh->b_page);
		spin_unlock_irq(&btnc->tree_lock);
		/*
		 * Note: page->index will not change to newkey until
		 * nilfs_btnode_commit_change_key() will be called.
		 * To protect the page in intermediate state, the page lock
		 * is held.
		 */
		radix_tree_preload_end();
		if (!err)
			return 0;
		else if (err != -EEXIST)
			goto failed_unlock;

		err = invalidate_inode_pages2_range(btnc, newkey, newkey);
		if (!err)
			goto retry;
		/* fallback to copy mode */
		unlock_page(obh->b_page);
	}

	nbh = nilfs_btnode_create_block(btnc, newkey);
	if (!nbh)
		return -ENOMEM;

	BUG_ON(nbh == obh);
	ctxt->newbh = nbh;
	return 0;

 failed_unlock:
	unlock_page(obh->b_page);
	return err;
}

static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
{
	struct acm *acm = container_of(port, struct acm, port);
	int retval = -ENODEV;

	dev_dbg(&acm->control->dev, "%s\n", __func__);

	mutex_lock(&acm->mutex);
	if (acm->disconnected)
		goto disconnected;

	retval = usb_autopm_get_interface(acm->control);
	if (retval)
		goto error_get_interface;

	/*
	 * FIXME: Why do we need this? Allocating 64K of physically contiguous
	 * memory is really nasty...
	 */
	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
	acm->control->needs_remote_wakeup = 1;

	acm->ctrlurb->dev = acm->dev;
	if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
		dev_err(&acm->control->dev,
			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
		goto error_submit_urb;
	}

	acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
	if (acm_set_control(acm, acm->ctrlout) < 0 &&
	    (acm->ctrl_caps & USB_CDC_CAP_LINE))
		goto error_set_control;

	usb_autopm_put_interface(acm->control);

	/*
	 * Unthrottle device in case the TTY was closed while throttled.
	 */
	spin_lock_irq(&acm->read_lock);
	acm->throttled = 0;
	acm->throttle_req = 0;
	spin_unlock_irq(&acm->read_lock);

	if (acm_submit_read_urbs(acm, GFP_KERNEL))
		goto error_submit_read_urbs;

	mutex_unlock(&acm->mutex);

	return 0;

error_submit_read_urbs:
	acm->ctrlout = 0;
	acm_set_control(acm, acm->ctrlout);
error_set_control:
	usb_kill_urb(acm->ctrlurb);
error_submit_urb:
	usb_autopm_put_interface(acm->control);
error_get_interface:
disconnected:
	mutex_unlock(&acm->mutex);
	return retval;
}

static int s5p_ehci_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = s5p_ehci->hcd;
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);

	clk_enable(s5p_ehci->clk);

	s5p_ehci_phy_init(pdev);

	/* if EHCI was off, hcd was removed */
	if (!s5p_ehci->power_on) {
		dev_info(dev, "Nothing to do for the device (power off)\n");
		return 0;
	}

	if (time_before(jiffies, ehci->next_statechange))
		usleep_range(10000, 11000);

	/* Mark hardware accessible again as we are out of D3 state by now */
	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
	if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
		int	mask = INTR_MASK;

		if (!hcd->self.root_hub->do_remote_wakeup)
			mask &= ~STS_PCD;
		ehci_writel(ehci, mask, &ehci->regs->intr_enable);
		ehci_readl(ehci, &ehci->regs->intr_enable);
		return 0;
	}

	ehci_dbg(ehci, "lost power, restarting\n");
	usb_root_hub_lost_power(hcd->self.root_hub);

	(void) ehci_halt(ehci);
	(void) ehci_reset(ehci);

	/* emptying the schedule aborts any urbs */
	spin_lock_irq(&ehci->lock);
	if (ehci->reclaim)
		end_unlink_async(ehci);
	ehci_work(ehci);
	spin_unlock_irq(&ehci->lock);

	ehci_writel(ehci, ehci->command, &ehci->regs->command);
	ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
	ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */

	/* here we "know" root ports should always stay powered */
	ehci_port_power(ehci, 1);

	hcd->state = HC_STATE_SUSPENDED;

	/* Update runtime PM status and clear runtime_error */
	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	/* Prevent device from runtime suspend during resume time */
	pm_runtime_get_sync(dev);

#ifdef CONFIG_MDM_HSIC_PM
	set_host_stat(hsic_pm_dev, POWER_ON);
	wait_dev_pwr_stat(hsic_pm_dev, POWER_ON);
#endif
#if defined(CONFIG_LINK_DEVICE_HSIC) || defined(CONFIG_LINK_DEVICE_USB) \
	|| defined(CONFIG_MDM_HSIC_PM)
	pm_runtime_mark_last_busy(&hcd->self.root_hub->dev);
#endif
	return 0;
}

/**
 * nilfs_copy_back_pages -- copy back pages to original cache from shadow cache
 * @dmap: destination page cache
 * @smap: source page cache
 *
 * No pages must no be added to the cache during this process.
 * This must be ensured by the caller.
 */
void nilfs_copy_back_pages(struct address_space *dmap,
			   struct address_space *smap)
{
	struct pagevec pvec;
	unsigned int i, n;
	pgoff_t index = 0;
	int err;

	pagevec_init(&pvec, 0);
repeat:
	n = pagevec_lookup(&pvec, smap, index, PAGEVEC_SIZE);
	if (!n)
		return;
	index = pvec.pages[n - 1]->index + 1;

	for (i = 0; i < pagevec_count(&pvec); i++) {
		struct page *page = pvec.pages[i], *dpage;
		pgoff_t offset = page->index;

		lock_page(page);
		dpage = find_lock_page(dmap, offset);
		if (dpage) {
			/* override existing page on the destination cache */
			WARN_ON(PageDirty(dpage));
			nilfs_copy_page(dpage, page, 0);
			unlock_page(dpage);
			page_cache_release(dpage);
		} else {
			struct page *page2;

			/* move the page to the destination cache */
			spin_lock_irq(&smap->tree_lock);
			page2 = radix_tree_delete(&smap->page_tree, offset);
			WARN_ON(page2 != page);

			smap->nrpages--;
			spin_unlock_irq(&smap->tree_lock);

			spin_lock_irq(&dmap->tree_lock);
			err = radix_tree_insert(&dmap->page_tree, offset, page);
			if (unlikely(err < 0)) {
				WARN_ON(err == -EEXIST);
				page->mapping = NULL;
				page_cache_release(page); /* for cache */
			} else {
				page->mapping = dmap;
				dmap->nrpages++;
				if (PageDirty(page))
					radix_tree_tag_set(&dmap->page_tree,
							   offset,
							   PAGECACHE_TAG_DIRTY);
			}
			spin_unlock_irq(&dmap->tree_lock);
		}
		unlock_page(page);
	}
	pagevec_release(&pvec);
	cond_resched();

	goto repeat;
}

static inline void pnx4008_dma_unlock(void)
{
	spin_unlock_irq(&dma_lock);
}

int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
{
	struct mixart_msg resp;
	u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
	int err;
	wait_queue_t wait;
	long timeout;

	mutex_lock(&mgr->msg_mutex);

	init_waitqueue_entry(&wait, current);

	spin_lock_irq(&mgr->msg_lock);
	/* send the message */
	err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
	if (err) {
		spin_unlock_irq(&mgr->msg_lock);
		mutex_unlock(&mgr->msg_mutex);
		return err;
	}

	set_current_state(TASK_UNINTERRUPTIBLE);
	add_wait_queue(&mgr->msg_sleep, &wait);
	spin_unlock_irq(&mgr->msg_lock);
	timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
	remove_wait_queue(&mgr->msg_sleep, &wait);

	if (! timeout) {
		/* error - no ack */
		mutex_unlock(&mgr->msg_mutex);
		snd_printk(KERN_ERR "error: no response on msg %x\n", msg_frame);
		return -EIO;
	}

	/* retrieve the answer into the same struct mixart_msg */
	resp.message_id = 0;
	resp.uid = (struct mixart_uid){0,0};
	resp.data = resp_data;
	resp.size = max_resp_size;

	err = get_msg(mgr, &resp, msg_frame);

	if( request->message_id != resp.message_id )
		snd_printk(KERN_ERR "RESPONSE ERROR!\n");

	mutex_unlock(&mgr->msg_mutex);
	return err;
}


int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
				   struct mixart_msg *request, u32 notif_event)
{
	int err;
	wait_queue_t wait;
	long timeout;

	if (snd_BUG_ON(!notif_event))
		return -EINVAL;
	if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
		return -EINVAL;
	if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
		return -EINVAL;

	mutex_lock(&mgr->msg_mutex);

	init_waitqueue_entry(&wait, current);

	spin_lock_irq(&mgr->msg_lock);
	/* send the message */
	err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
	if(err) {
		spin_unlock_irq(&mgr->msg_lock);
		mutex_unlock(&mgr->msg_mutex);
		return err;
	}

	set_current_state(TASK_UNINTERRUPTIBLE);
	add_wait_queue(&mgr->msg_sleep, &wait);
	spin_unlock_irq(&mgr->msg_lock);
	timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
	remove_wait_queue(&mgr->msg_sleep, &wait);

	if (! timeout) {
		/* error - no ack */
		mutex_unlock(&mgr->msg_mutex);
		snd_printk(KERN_ERR "error: notification %x not received\n", notif_event);
		return -EIO;
	}

	mutex_unlock(&mgr->msg_mutex);
	return 0;
}

static void
netx_set_termios(struct uart_port *port, struct termios *termios,
		   struct termios *old)
{
	unsigned int baud, quot;
	unsigned char old_cr;
	unsigned char line_cr = LINE_CR_FEN;
	unsigned char rts_cr = 0;

	switch (termios->c_cflag & CSIZE) {
	case CS5:
		line_cr |= LINE_CR_5BIT;
		break;
	case CS6:
		line_cr |= LINE_CR_6BIT;
		break;
	case CS7:
		line_cr |= LINE_CR_7BIT;
		break;
	case CS8:
		line_cr |= LINE_CR_8BIT;
		break;
	}

	if (termios->c_cflag & CSTOPB)
		line_cr |= LINE_CR_STP2;

	if (termios->c_cflag & PARENB) {
		line_cr |= LINE_CR_PEN;
		if (!(termios->c_cflag & PARODD))
			line_cr |= LINE_CR_EPS;
	}

	if (termios->c_cflag & CRTSCTS)
		rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;

	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
	quot = baud * 4096;
	quot /= 1000;
	quot *= 256;
	quot /= 100000;

	spin_lock_irq(&port->lock);

	uart_update_timeout(port, termios->c_cflag, baud);

	old_cr = readl(port->membase + UART_CR);

	/* disable interrupts */
	writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
		port->membase + UART_CR);

	/* drain transmitter */
	while (readl(port->membase + UART_FR) & FR_BUSY);

	/* disable UART */
	writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);

	/* modem status interrupts */
	old_cr &= ~CR_MSIE;
	if (UART_ENABLE_MS(port, termios->c_cflag))
		old_cr |= CR_MSIE;

	writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
	writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
	writel(line_cr, port->membase + UART_LINE_CR);

	writel(rts_cr, port->membase + UART_RTS_CR);

	/*
	 * Characters to ignore
	 */
	port->ignore_status_mask = 0;
	if (termios->c_iflag & IGNPAR)
		port->ignore_status_mask |= SR_PE;
	if (termios->c_iflag & IGNBRK) {
		port->ignore_status_mask |= SR_BE;
		/*
		 * If we're ignoring parity and break indicators,
		 * ignore overruns too (for real raw support).
		 */
		if (termios->c_iflag & IGNPAR)
			port->ignore_status_mask |= SR_PE;
	}

	port->read_status_mask = 0;
	if (termios->c_iflag & (BRKINT | PARMRK))
		port->read_status_mask |= SR_BE;
	if (termios->c_iflag & INPCK)
		port->read_status_mask |= SR_PE | SR_FE;

	writel(old_cr, port->membase + UART_CR);

	spin_unlock_irq(&port->lock);
}

static int msm_hsic_resume_thread(void *data)
{
	struct msm_hsic_hcd *mehci = data;
	struct usb_hcd *hcd = hsic_to_hcd(mehci);
	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
	u32			temp;
	unsigned long		resume_needed = 0;
	int			retry_cnt = 0;
	int			tight_resume = 0;
	struct msm_hsic_host_platform_data *pdata = mehci->dev->platform_data;

	dbg_log_event(NULL, "Resume RH", 0);

	/* keep delay between bus states */
	if (time_before(jiffies, ehci->next_statechange))
		usleep_range(5000, 5000);

	spin_lock_irq(&ehci->lock);
	if (!HCD_HW_ACCESSIBLE(hcd)) {
		spin_unlock_irq(&ehci->lock);
		mehci->resume_status = -ESHUTDOWN;
		complete(&mehci->rt_completion);
		return 0;
	}

	if (unlikely(ehci->debug)) {
		if (!dbgp_reset_prep())
			ehci->debug = NULL;
		else
			dbgp_external_startup();
	}

	/* at least some APM implementations will try to deliver
	 * IRQs right away, so delay them until we're ready.
	 */
	ehci_writel(ehci, 0, &ehci->regs->intr_enable);

	/* re-init operational registers */
	ehci_writel(ehci, 0, &ehci->regs->segment);
	ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
	ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);

	/*CMD_RUN will be set after, PORT_RESUME gets cleared*/
	if (ehci->resume_sof_bug)
		ehci->command &= ~CMD_RUN;

	/* restore CMD_RUN, framelist size, and irq threshold */
	ehci_writel(ehci, ehci->command, &ehci->regs->command);

	/* manually resume the ports we suspended during bus_suspend() */
resume_again:
	if (retry_cnt >= RESUME_RETRY_LIMIT) {
		pr_info("retry count(%d) reached max, resume in tight loop\n",
					retry_cnt);
		tight_resume = 1;
	}


	temp = ehci_readl(ehci, &ehci->regs->port_status[0]);
	temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
	if (test_bit(0, &ehci->bus_suspended) && (temp & PORT_SUSPEND)) {
		temp |= PORT_RESUME;
		set_bit(0, &resume_needed);
	}
	dbg_log_event(NULL, "FPR: Set", temp);
	ehci_writel(ehci, temp, &ehci->regs->port_status[0]);

	/* HSIC controller has a h/w bug due to which it can try to send SOFs
	 * (start of frames) during port resume resulting in phy lockup. HSIC hw
	 * controller in MSM clears FPR bit after driving the resume signal for
	 * 20ms. Workaround is to stop SOFs before driving resume and then start
	 * sending SOFs immediately. Need to send SOFs within 3ms of resume
	 * completion otherwise peripheral may enter undefined state. As
	 * usleep_range does not gurantee exact sleep time, GPTimer is used to
	 * to time the resume sequence. If driver exceeds allowable time SOFs,
	 * repeat the resume process.
	 */
	if (ehci->resume_sof_bug && resume_needed) {
		if (!tight_resume) {
			mehci->resume_again = 0;
			ehci_writel(ehci, GPT_LD(RESUME_SIGNAL_TIME_MS),
					&mehci->timer->gptimer0_ld);
			ehci_writel(ehci, GPT_RESET | GPT_RUN,
					&mehci->timer->gptimer0_ctrl);
			ehci_writel(ehci, INTR_MASK | STS_GPTIMER0_INTERRUPT,
					&ehci->regs->intr_enable);

			ehci_writel(ehci, GPT_LD(RESUME_SIGNAL_TIME_SOF_MS),
					&mehci->timer->gptimer1_ld);
			ehci_writel(ehci, GPT_RESET | GPT_RUN,
				&mehci->timer->gptimer1_ctrl);

			spin_unlock_irq(&ehci->lock);
			if (pdata && pdata->swfi_latency)
				pm_qos_update_request(&mehci->pm_qos_req_dma,
					pdata->swfi_latency + 1);
			wait_for_completion(&mehci->gpt0_completion);
			if (pdata && pdata->swfi_latency)
				pm_qos_update_request(&mehci->pm_qos_req_dma,
					PM_QOS_DEFAULT_VALUE);
//.........这里部分代码省略.........

asmlinkage void
irix_sigreturn(struct pt_regs *regs)
{
	struct sigctx_irix5 *context, *magic;
	unsigned long umask, mask;
	u64 *fregs;
	int sig, i, base = 0;
	sigset_t blocked;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	if (regs->regs[2] == 1000)
		base = 1;

	context = (struct sigctx_irix5 *) regs->regs[base + 4];
	magic = (struct sigctx_irix5 *) regs->regs[base + 5];
	sig = (int) regs->regs[base + 6];
#ifdef DEBUG_SIG
	printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
	       current->comm, current->pid, context, magic, sig);
#endif
	if (!context)
		context = magic;
	if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
		goto badframe;

#ifdef DEBUG_SIG
	dump_irix5_sigctx(context);
#endif

	__get_user(regs->cp0_epc, &context->pc);
	umask = context->rmask; mask = 2;
	for (i = 1; i < 32; i++, mask <<= 1) {
		if(umask & mask)
			__get_user(regs->regs[i], &context->regs[i]);
	}
	__get_user(regs->hi, &context->hi);
	__get_user(regs->lo, &context->lo);

	if ((umask & 1) && context->usedfp) {
		fregs = (u64 *) &current->thread.fpu;
		for(i = 0; i < 32; i++)
			fregs[i] = (u64) context->fpregs[i];
		__get_user(current->thread.fpu.hard.fcr31, &context->fpcsr);
	}

	/* XXX do sigstack crapola here... XXX */

	if (__copy_from_user(&blocked, &context->sigset, sizeof(blocked)))
		goto badframe;

	sigdelsetmask(&blocked, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = blocked;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	/*
	 * Don't let your children do this ...
	 */
	if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
		do_syscall_trace(regs, 1);
	__asm__ __volatile__(
		"move\t$29,%0\n\t"
		"j\tsyscall_exit"
		:/* no outputs */
		:"r" (&regs));
		/* Unreached */

badframe:
	force_sig(SIGSEGV, current);
}

static void virtio_config_disable(struct virtio_device *dev)
{
	spin_lock_irq(&dev->config_lock);
	dev->config_enabled = false;
	spin_unlock_irq(&dev->config_lock);
}

/* Note that 'init' is a special process: it doesn't get signals it doesn't
 * want to handle. Thus you cannot kill init even with a SIGKILL even by
 * mistake.
 */
asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
			 unsigned long orig_i0, int restart_syscall)
{
	unsigned long signr;
	siginfo_t info;
	struct k_sigaction *ka;
	
	if (!oldset)
		oldset = &current->blocked;

#ifdef CONFIG_SPARC32_COMPAT
	if (current->thread.flags & SPARC_FLAG_32BIT) {
		extern asmlinkage int do_signal32(sigset_t *, struct pt_regs *,
						  unsigned long, int);
		return do_signal32(oldset, regs, orig_i0, restart_syscall);
	}
#endif	
	for (;;) {
		spin_lock_irq(&current->sigmask_lock);
		signr = dequeue_signal(&current->blocked, &info);
		spin_unlock_irq(&current->sigmask_lock);
		
		if (!signr) break;

		if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
			current->exit_code = signr;
			current->state = TASK_STOPPED;
			notify_parent(current, SIGCHLD);
			schedule();
			if (!(signr = current->exit_code))
				continue;
			current->exit_code = 0;
			if (signr == SIGSTOP)
				continue;

			/* Update the siginfo structure.  Is this good?  */
			if (signr != info.si_signo) {
				info.si_signo = signr;
				info.si_errno = 0;
				info.si_code = SI_USER;
				info.si_pid = current->p_pptr->pid;
				info.si_uid = current->p_pptr->uid;
			}

			/* If the (new) signal is now blocked, requeue it.  */
			if (sigismember(&current->blocked, signr)) {
				send_sig_info(signr, &info, current);
				continue;
			}
		}
		
		ka = &current->sig->action[signr-1];
		
		if(ka->sa.sa_handler == SIG_IGN) {
			if(signr != SIGCHLD)
				continue;

                        /* sys_wait4() grabs the master kernel lock, so
                         * we need not do so, that sucker should be
                         * threaded and would not be that difficult to
                         * do anyways.
                         */
                        while(sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
                                ;
			continue;
		}
		if(ka->sa.sa_handler == SIG_DFL) {
			unsigned long exit_code = signr;
			
			if(current->pid == 1)
				continue;
			switch(signr) {
			case SIGCONT: case SIGCHLD: case SIGWINCH:
				continue;

			case SIGTSTP: case SIGTTIN: case SIGTTOU:
				if (is_orphaned_pgrp(current->pgrp))
					continue;

			case SIGSTOP:
				if (current->ptrace & PT_PTRACED)
					continue;
				current->state = TASK_STOPPED;
				current->exit_code = signr;
				if(!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags &
				     SA_NOCLDSTOP))
					notify_parent(current, SIGCHLD);
				schedule();
				continue;

			case SIGQUIT: case SIGILL: case SIGTRAP:
			case SIGABRT: case SIGFPE: case SIGSEGV:
			case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
				if (do_coredump(signr, regs))
					exit_code |= 0x80;
#ifdef DEBUG_SIGNALS
//.........这里部分代码省略.........

static void
handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
	struct pt_regs * regs)
{
	struct k_sigaction *ka = &current->sighand->action[sig-1];

	/* Are we from a system call? */
	if (regs->tra >= 0) {
		/* If so, check system call restarting.. */
		switch (regs->regs[0]) {
			case -ERESTARTNOHAND:
				regs->regs[0] = -EINTR;
				break;

			case -ERESTARTSYS:
				if (!(ka->sa.sa_flags & SA_RESTART)) {
					regs->regs[0] = -EINTR;
					break;
				}
			/* fallthrough */
			case -ERESTARTNOINTR:
				regs->pc -= 2;
		}
	} else {
		/* gUSA handling */
#ifdef CONFIG_PREEMPT
		unsigned long flags;

		local_irq_save(flags);
#endif
		if (regs->regs[15] >= 0xc0000000) {
			int offset = (int)regs->regs[15];

			/* Reset stack pointer: clear critical region mark */
			regs->regs[15] = regs->regs[1];
			if (regs->pc < regs->regs[0])
				/* Go to rewind point #1 */
				regs->pc = regs->regs[0] + offset - 2;
		}
#ifdef CONFIG_PREEMPT
		local_irq_restore(flags);
#endif
	}

	/* Set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		setup_rt_frame(sig, ka, info, oldset, regs);
	else
		setup_frame(sig, ka, oldset, regs);

	if (ka->sa.sa_flags & SA_ONESHOT)
		ka->sa.sa_handler = SIG_DFL;

	if (!(ka->sa.sa_flags & SA_NODEFER)) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
		sigaddset(&current->blocked,sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}
}