void binder_alloc_deferred_release()

in binder_alloc.c [812:876]

• 53 lines of code
• 9 McCabe index (conditional complexity)

void binder_alloc_deferred_release(struct binder_alloc *alloc)
{
	struct rb_node *n;
	int buffers, page_count;
	struct binder_buffer *buffer;

	buffers = 0;
	mutex_lock(&alloc->mutex);
	BUG_ON(alloc->vma);

	while ((n = rb_first(&alloc->allocated_buffers))) {
		buffer = rb_entry(n, struct binder_buffer, rb_node);

		/* Transaction should already have been freed */
		BUG_ON(buffer->transaction);

		if (buffer->clear_on_free) {
			binder_alloc_clear_buf(alloc, buffer);
			buffer->clear_on_free = false;
		}
		binder_free_buf_locked(alloc, buffer);
		buffers++;
	}

	while (!list_empty(&alloc->buffers)) {
		buffer = list_first_entry(&alloc->buffers,
					  struct binder_buffer, entry);
		WARN_ON(!buffer->free);

		list_del(&buffer->entry);
		WARN_ON_ONCE(!list_empty(&alloc->buffers));
		kfree(buffer);
	}

	page_count = 0;
	if (alloc->pages) {
		int i;

		for (i = 0; i < alloc->buffer_size / PAGE_SIZE; i++) {
			void __user *page_addr;
			bool on_lru;

			if (!alloc->pages[i].page_ptr)
				continue;

			on_lru = list_lru_del(&binder_alloc_lru,
					      &alloc->pages[i].lru);
			page_addr = alloc->buffer + i * PAGE_SIZE;
			binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
				     "%s: %d: page %d at %pK %s\n",
				     __func__, alloc->pid, i, page_addr,
				     on_lru ? "on lru" : "active");
			__free_page(alloc->pages[i].page_ptr);
			page_count++;
		}
		kfree(alloc->pages);
	}
	mutex_unlock(&alloc->mutex);
	if (alloc->vma_vm_mm)
		mmdrop(alloc->vma_vm_mm);

	binder_alloc_debug(BINDER_DEBUG_OPEN_CLOSE,
		     "%s: %d buffers %d, pages %d\n",
		     __func__, alloc->pid, buffers, page_count);
}