static int binder_alloc_do_buffer_copy()

in binder_alloc.c [1239:1277]

• 32 lines of code
• 4 McCabe index (conditional complexity)

static int binder_alloc_do_buffer_copy(struct binder_alloc *alloc,
				       bool to_buffer,
				       struct binder_buffer *buffer,
				       binder_size_t buffer_offset,
				       void *ptr,
				       size_t bytes)
{
	/* All copies must be 32-bit aligned and 32-bit size */
	if (!check_buffer(alloc, buffer, buffer_offset, bytes))
		return -EINVAL;

	while (bytes) {
		unsigned long size;
		struct page *page;
		pgoff_t pgoff;
		void *tmpptr;
		void *base_ptr;

		page = binder_alloc_get_page(alloc, buffer,
					     buffer_offset, &pgoff);
		size = min_t(size_t, bytes, PAGE_SIZE - pgoff);
		base_ptr = kmap_atomic(page);
		tmpptr = base_ptr + pgoff;
		if (to_buffer)
			memcpy(tmpptr, ptr, size);
		else
			memcpy(ptr, tmpptr, size);
		/*
		 * kunmap_atomic() takes care of flushing the cache
		 * if this device has VIVT cache arch
		 */
		kunmap_atomic(base_ptr);
		bytes -= size;
		pgoff = 0;
		ptr = ptr + size;
		buffer_offset += size;
	}
	return 0;
}