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-rw-r--r--drivers/virtio/virtio_balloon.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 25ebe8eecdb7..c3eb93fc9261 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -163,8 +163,8 @@ static void release_pages_by_pfn(const u32 pfns[], unsigned int num)
/* Find pfns pointing at start of each page, get pages and free them. */
for (i = 0; i < num; i += VIRTIO_BALLOON_PAGES_PER_PAGE) {
struct page *page = balloon_pfn_to_page(pfns[i]);
- balloon_page_free(page);
adjust_managed_page_count(page, 1);
+ put_page(page); /* balloon reference */
}
}
@@ -395,6 +395,8 @@ static int virtballoon_migratepage(struct address_space *mapping,
if (!mutex_trylock(&vb->balloon_lock))
return -EAGAIN;
+ get_page(newpage); /* balloon reference */
+
/* balloon's page migration 1st step -- inflate "newpage" */
spin_lock_irqsave(&vb_dev_info->pages_lock, flags);
balloon_page_insert(newpage, mapping, &vb_dev_info->pages);
@@ -404,12 +406,7 @@ static int virtballoon_migratepage(struct address_space *mapping,
set_page_pfns(vb->pfns, newpage);
tell_host(vb, vb->inflate_vq);
- /*
- * balloon's page migration 2nd step -- deflate "page"
- *
- * It's safe to delete page->lru here because this page is at
- * an isolated migration list, and this step is expected to happen here
- */
+ /* balloon's page migration 2nd step -- deflate "page" */
balloon_page_delete(page);
vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE;
set_page_pfns(vb->pfns, page);
@@ -417,7 +414,9 @@ static int virtballoon_migratepage(struct address_space *mapping,
mutex_unlock(&vb->balloon_lock);
- return MIGRATEPAGE_BALLOON_SUCCESS;
+ put_page(page); /* balloon reference */
+
+ return MIGRATEPAGE_SUCCESS;
}
/* define the balloon_mapping->a_ops callback to allow balloon page migration */