video/fbdev/udlfb.c

81 /* dlfb keeps a list of urbs for efficient bulk transfers */
1750 	/* When non-active we'll update virtual framebuffer, but no new urbs */
1753 	/* this function will wait for all in-flight urbs to complete */
1796 	urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */
1798 	spin_lock_irqsave(&dlfb->urbs.lock, flags);
1799 	list_add_tail(&unode->entry, &dlfb->urbs.list);
1800 	dlfb->urbs.available++;
1801 	spin_unlock_irqrestore(&dlfb->urbs.lock, flags);
1803 	up(&dlfb->urbs.limit_sem);
1808 	int count = dlfb->urbs.count;
1815 		down(&dlfb->urbs.limit_sem);
1817 		spin_lock_irq(&dlfb->urbs.lock);
1819 		node = dlfb->urbs.list.next; /* have reserved one with sem */
1822 		spin_unlock_irq(&dlfb->urbs.lock);
1828 		usb_free_coherent(urb->dev, dlfb->urbs.size,
1834 	dlfb->urbs.count = 0;
1844 	spin_lock_init(&dlfb->urbs.lock);
1847 	dlfb->urbs.size = size;
1848 	INIT_LIST_HEAD(&dlfb->urbs.list);
1850 	sema_init(&dlfb->urbs.limit_sem, 0);
1851 	dlfb->urbs.count = 0;
1852 	dlfb->urbs.available = 0;
1854 	while (dlfb->urbs.count * size < wanted_size) {
1886 		list_add_tail(&unode->entry, &dlfb->urbs.list);
1888 		up(&dlfb->urbs.limit_sem);
1889 		dlfb->urbs.count++;
1890 		dlfb->urbs.available++;
1893 	return dlfb->urbs.count;
1903 	ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT);
1908 			 ret, dlfb->urbs.available);
1912 	spin_lock_irq(&dlfb->urbs.lock);
1914 	BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */
1915 	entry = dlfb->urbs.list.next;
1917 	dlfb->urbs.available--;
1919 	spin_unlock_irq(&dlfb->urbs.lock);
1929 	BUG_ON(len > dlfb->urbs.size);