static int dma_buf_debug_show()

in dma-buf.c [1326:1386]

• 46 lines of code
• 3 McCabe index (conditional complexity)

static int dma_buf_debug_show(struct seq_file *s, void *unused)
{
	struct dma_buf *buf_obj;
	struct dma_buf_attachment *attach_obj;
	int count = 0, attach_count;
	size_t size = 0;
	int ret;

	ret = mutex_lock_interruptible(&db_list.lock);

	if (ret)
		return ret;

	seq_puts(s, "\nDma-buf Objects:\n");
	seq_printf(s, "%-8s\t%-8s\t%-8s\t%-8s\texp_name\t%-8s\n",
		   "size", "flags", "mode", "count", "ino");

	list_for_each_entry(buf_obj, &db_list.head, list_node) {

		ret = dma_resv_lock_interruptible(buf_obj->resv, NULL);
		if (ret)
			goto error_unlock;


		spin_lock(&buf_obj->name_lock);
		seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\t%08lu\t%s\n",
				buf_obj->size,
				buf_obj->file->f_flags, buf_obj->file->f_mode,
				file_count(buf_obj->file),
				buf_obj->exp_name,
				file_inode(buf_obj->file)->i_ino,
				buf_obj->name ?: "");
		spin_unlock(&buf_obj->name_lock);

		dma_resv_describe(buf_obj->resv, s);

		seq_puts(s, "\tAttached Devices:\n");
		attach_count = 0;

		list_for_each_entry(attach_obj, &buf_obj->attachments, node) {
			seq_printf(s, "\t%s\n", dev_name(attach_obj->dev));
			attach_count++;
		}
		dma_resv_unlock(buf_obj->resv);

		seq_printf(s, "Total %d devices attached\n\n",
				attach_count);

		count++;
		size += buf_obj->size;
	}

	seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size);

	mutex_unlock(&db_list.lock);
	return 0;

error_unlock:
	mutex_unlock(&db_list.lock);
	return ret;
}