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-rw-r--r--mm/swap_state.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c
index fd2f21e1c60a..56a3cc4f1068 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -543,6 +543,13 @@ struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t gfp_mask,
if (!mask)
goto skip;
+ /* Test swap type to make sure the dereference is safe */
+ if (likely(si->flags & (SWP_BLKDEV | SWP_FS))) {
+ struct inode *inode = si->swap_file->f_mapping->host;
+ if (inode_read_congested(inode))
+ goto skip;
+ }
+
do_poll = false;
/* Read a page_cluster sized and aligned cluster around offset. */
start_offset = offset & ~mask;