C++ (Cpp) packet_read_list Examples

Example #1

File: dell_rbu.c Project: Epirex/Chrono_Kernel-1

static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
{
	int retval;
	size_t bytes_left;
	size_t data_length;
	char *ptempBuf = buffer;

	/* check to see if we have something to return */
	if (rbu_data.num_packets == 0) {
		pr_debug("read_packet_data: no packets written\n");
		retval = -ENOMEM;
		goto read_rbu_data_exit;
	}

	if (pos > rbu_data.imagesize) {
		retval = 0;
#ifdef CONFIG_DEBUG_PRINTK
		printk(KERN_WARNING "dell_rbu:read_packet_data: "
			"data underrun\n");
#else
		;
#endif
		goto read_rbu_data_exit;
	}

	bytes_left = rbu_data.imagesize - pos;
	data_length = min(bytes_left, count);

	if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
		goto read_rbu_data_exit;

	if ((pos + count) > rbu_data.imagesize) {
		rbu_data.packet_read_count = 0;
		/* this was the last copy */
		retval = bytes_left;
	} else
		retval = count;

      read_rbu_data_exit:
	return retval;
}

Example #2

File: dell_rbu.c Project: AsadRaza/OCTEON-Linux

/*
 * img_update_realloc: This function allocates the contiguous pages to
 * accommodate the requested size of data. The memory address and size
 * values are stored globally and on every call to this function the new
 * size is checked to see if more data is required than the existing size.
 * If true the previous memory is freed and new allocation is done to
 * accommodate the new size. If the incoming size is less then than the
 * already allocated size, then that memory is reused. This function is
 * called with lock held and returns with lock held.
 */
static int img_update_realloc(unsigned long size)
{
	unsigned char *image_update_buffer = NULL;
	unsigned long rc;
#ifndef CONFIG_XEN
	unsigned long img_buf_phys_addr;
#endif
	int ordernum;
	int dma_alloc = 0;

	/*
	 * check if the buffer of sufficient size has been
	 * already allocated
	 */
	if (rbu_data.image_update_buffer_size >= size) {
		/*
		 * check for corruption
		 */
		if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
			printk(KERN_ERR "dell_rbu:%s: corruption "
				"check failed\n", __func__);
			return -EINVAL;
		}
		/*
		 * we have a valid pre-allocated buffer with
		 * sufficient size
		 */
		return 0;
	}

	/*
	 * free any previously allocated buffer
	 */
	img_update_free();

	spin_unlock(&rbu_data.lock);

#ifndef CONFIG_XEN
	ordernum = get_order(size);
	image_update_buffer =
		(unsigned char *) __get_free_pages(GFP_KERNEL, ordernum);

	img_buf_phys_addr =
		(unsigned long) virt_to_bus(image_update_buffer);

	if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
		free_pages((unsigned long) image_update_buffer, ordernum);
#else
	{
#endif
		ordernum = -1;
		image_update_buffer = dma_alloc_coherent(NULL, size,
			&dell_rbu_dmaaddr, GFP_KERNEL);
		dma_alloc = 1;
	}

	spin_lock(&rbu_data.lock);

	if (image_update_buffer != NULL) {
		rbu_data.image_update_buffer = image_update_buffer;
		rbu_data.image_update_buffer_size = size;
		rbu_data.bios_image_size =
			rbu_data.image_update_buffer_size;
		rbu_data.image_update_ordernum = ordernum;
		rbu_data.dma_alloc = dma_alloc;
		rc = 0;
	} else {
		pr_debug("Not enough memory for image update:"
			"size = %ld\n", size);
		rc = -ENOMEM;
	}

	return rc;
}

static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
{
	int retval;
	size_t bytes_left;
	size_t data_length;
	char *ptempBuf = buffer;

	/* check to see if we have something to return */
	if (rbu_data.num_packets == 0) {
		pr_debug("read_packet_data: no packets written\n");
		retval = -ENOMEM;
		goto read_rbu_data_exit;
	}

	if (pos > rbu_data.imagesize) {
		retval = 0;
		printk(KERN_WARNING "dell_rbu:read_packet_data: "
			"data underrun\n");
		goto read_rbu_data_exit;
	}

	bytes_left = rbu_data.imagesize - pos;
	data_length = min(bytes_left, count);

	if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
		goto read_rbu_data_exit;

	if ((pos + count) > rbu_data.imagesize) {
		rbu_data.packet_read_count = 0;
		/* this was the last copy */
		retval = bytes_left;
	} else
		retval = count;

      read_rbu_data_exit:
	return retval;
}