static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
				 size_t count, loff_t *offset)
{
	long result, timeout;
	int count1;
	struct snd_rawmidi_file *rfile;
	struct snd_rawmidi_runtime *runtime;
	struct snd_rawmidi_substream *substream;

	rfile = file->private_data;
	substream = rfile->output;
	runtime = substream->runtime;
	/* we cannot put an atomic message to our buffer */
	if (substream->append && count > runtime->buffer_size)
		return -EIO;
	result = 0;
	while (count > 0) {
		spin_lock_irq(&runtime->lock);
		while (!snd_rawmidi_ready_append(substream, count)) {
			wait_queue_entry_t wait;
			if (file->f_flags & O_NONBLOCK) {
				spin_unlock_irq(&runtime->lock);
				return result > 0 ? result : -EAGAIN;
			}
			init_waitqueue_entry(&wait, current);
			add_wait_queue(&runtime->sleep, &wait);
			set_current_state(TASK_INTERRUPTIBLE);
			spin_unlock_irq(&runtime->lock);
			timeout = schedule_timeout(30 * HZ);
			remove_wait_queue(&runtime->sleep, &wait);
			if (rfile->rmidi->card->shutdown)
				return -ENODEV;
			if (signal_pending(current))
				return result > 0 ? result : -ERESTARTSYS;
			if (!runtime->avail && !timeout)
				return result > 0 ? result : -EIO;
			spin_lock_irq(&runtime->lock);
		}
		spin_unlock_irq(&runtime->lock);
		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
		if (count1 < 0)
			return result > 0 ? result : count1;
		result += count1;
		buf += count1;
		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
			break;
		count -= count1;
	}
	if (file->f_flags & O_DSYNC) {
		spin_lock_irq(&runtime->lock);
		while (runtime->avail != runtime->buffer_size) {
			wait_queue_entry_t wait;
			unsigned int last_avail = runtime->avail;
			init_waitqueue_entry(&wait, current);
			add_wait_queue(&runtime->sleep, &wait);
			set_current_state(TASK_INTERRUPTIBLE);
			spin_unlock_irq(&runtime->lock);
			timeout = schedule_timeout(30 * HZ);
			remove_wait_queue(&runtime->sleep, &wait);
			if (signal_pending(current))
				return result > 0 ? result : -ERESTARTSYS;
			if (runtime->avail == last_avail && !timeout)
				return result > 0 ? result : -EIO;
			spin_lock_irq(&runtime->lock);
		}
		spin_unlock_irq(&runtime->lock);
	}
	return result;
}
Unknown