示例#1
0
文件: main.c 项目: krzk/linux
/**
 * mei_write - the write function.
 *
 * @file: pointer to file structure
 * @ubuf: pointer to user buffer
 * @length: buffer length
 * @offset: data offset in buffer
 *
 * Return: >=0 data length on success , <0 on error
 */
static ssize_t mei_write(struct file *file, const char __user *ubuf,
			 size_t length, loff_t *offset)
{
	struct mei_cl *cl = file->private_data;
	struct mei_cl_cb *cb;
	struct mei_device *dev;
	int rets;

	if (WARN_ON(!cl || !cl->dev))
		return -ENODEV;

	dev = cl->dev;

	mutex_lock(&dev->device_lock);

	if (dev->dev_state != MEI_DEV_ENABLED) {
		rets = -ENODEV;
		goto out;
	}

	if (!mei_cl_is_connected(cl)) {
		cl_err(dev, cl, "is not connected");
		rets = -ENODEV;
		goto out;
	}

	if (!mei_me_cl_is_active(cl->me_cl)) {
		rets = -ENOTTY;
		goto out;
	}

	if (length > mei_cl_mtu(cl)) {
		rets = -EFBIG;
		goto out;
	}

	if (length == 0) {
		rets = 0;
		goto out;
	}

	while (cl->tx_cb_queued >= dev->tx_queue_limit) {
		if (file->f_flags & O_NONBLOCK) {
			rets = -EAGAIN;
			goto out;
		}
		mutex_unlock(&dev->device_lock);
		rets = wait_event_interruptible(cl->tx_wait,
				cl->writing_state == MEI_WRITE_COMPLETE ||
				(!mei_cl_is_connected(cl)));
		mutex_lock(&dev->device_lock);
		if (rets) {
			if (signal_pending(current))
				rets = -EINTR;
			goto out;
		}
		if (!mei_cl_is_connected(cl)) {
			rets = -ENODEV;
			goto out;
		}
	}

	*offset = 0;
	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
	if (!cb) {
		rets = -ENOMEM;
		goto out;
	}

	rets = copy_from_user(cb->buf.data, ubuf, length);
	if (rets) {
		dev_dbg(dev->dev, "failed to copy data from userland\n");
		rets = -EFAULT;
		mei_io_cb_free(cb);
		goto out;
	}

	rets = mei_cl_write(cl, cb);
out:
	mutex_unlock(&dev->device_lock);
	return rets;
}
示例#2
0
/**
 * mei_write - the write function.
 *
 * @file: pointer to file structure
 * @ubuf: pointer to user buffer
 * @length: buffer length
 * @offset: data offset in buffer
 *
 * Return: >=0 data length on success , <0 on error
 */
static ssize_t mei_write(struct file *file, const char __user *ubuf,
			 size_t length, loff_t *offset)
{
	struct mei_cl *cl = file->private_data;
	struct mei_cl_cb *cb;
	struct mei_device *dev;
	int rets;

	if (WARN_ON(!cl || !cl->dev))
		return -ENODEV;

	dev = cl->dev;

	mutex_lock(&dev->device_lock);

	if (dev->dev_state != MEI_DEV_ENABLED) {
		rets = -ENODEV;
		goto out;
	}

	if (!mei_cl_is_connected(cl)) {
		cl_err(dev, cl, "is not connected");
		rets = -ENODEV;
		goto out;
	}

	if (!mei_me_cl_is_active(cl->me_cl)) {
		rets = -ENOTTY;
		goto out;
	}

	if (length > mei_cl_mtu(cl)) {
		rets = -EFBIG;
		goto out;
	}

	if (length == 0) {
		rets = 0;
		goto out;
	}

	*offset = 0;
	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
	if (!cb) {
		rets = -ENOMEM;
		goto out;
	}

	rets = copy_from_user(cb->buf.data, ubuf, length);
	if (rets) {
		dev_dbg(dev->dev, "failed to copy data from userland\n");
		rets = -EFAULT;
		mei_io_cb_free(cb);
		goto out;
	}

	if (cl == &dev->iamthif_cl) {
		rets = mei_amthif_write(cl, cb);
		if (!rets)
			rets = length;
		goto out;
	}

	rets = mei_cl_write(cl, cb);
out:
	mutex_unlock(&dev->device_lock);
	return rets;
}
示例#3
0
文件: main.c 项目: lovejavaee/linux-2
/**
 * mei_write - the write function.
 *
 * @file: pointer to file structure
 * @ubuf: pointer to user buffer
 * @length: buffer length
 * @offset: data offset in buffer
 *
 * Return: >=0 data length on success , <0 on error
 */
static ssize_t mei_write(struct file *file, const char __user *ubuf,
			 size_t length, loff_t *offset)
{
	struct mei_cl *cl = file->private_data;
	struct mei_cl_cb *write_cb = NULL;
	struct mei_device *dev;
	unsigned long timeout = 0;
	int rets;

	if (WARN_ON(!cl || !cl->dev))
		return -ENODEV;

	dev = cl->dev;

	mutex_lock(&dev->device_lock);

	if (dev->dev_state != MEI_DEV_ENABLED) {
		rets = -ENODEV;
		goto out;
	}

	if (!mei_cl_is_connected(cl)) {
		cl_err(dev, cl, "is not connected");
		rets = -ENODEV;
		goto out;
	}

	if (!mei_me_cl_is_active(cl->me_cl)) {
		rets = -ENOTTY;
		goto out;
	}

	if (length > mei_cl_mtu(cl)) {
		rets = -EFBIG;
		goto out;
	}

	if (length == 0) {
		rets = 0;
		goto out;
	}

	if (cl == &dev->iamthif_cl) {
		write_cb = mei_amthif_find_read_list_entry(dev, file);

		if (write_cb) {
			timeout = write_cb->read_time +
				mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);

			if (time_after(jiffies, timeout)) {
				*offset = 0;
				mei_io_cb_free(write_cb);
				write_cb = NULL;
			}
		}
	}

	*offset = 0;
	write_cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
	if (!write_cb) {
		rets = -ENOMEM;
		goto out;
	}

	rets = copy_from_user(write_cb->buf.data, ubuf, length);
	if (rets) {
		dev_dbg(dev->dev, "failed to copy data from userland\n");
		rets = -EFAULT;
		goto out;
	}

	if (cl == &dev->iamthif_cl) {
		rets = mei_amthif_write(cl, write_cb);

		if (rets) {
			dev_err(dev->dev,
				"amthif write failed with status = %d\n", rets);
			goto out;
		}
		mutex_unlock(&dev->device_lock);
		return length;
	}

	rets = mei_cl_write(cl, write_cb, false);
out:
	mutex_unlock(&dev->device_lock);
	if (rets < 0)
		mei_io_cb_free(write_cb);
	return rets;
}