diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_io.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index 60977c970cdf..b23f494fcc83 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -327,8 +327,13 @@ static void bio_associate_blkg_from_page(struct bio *bio, struct folio *folio) rcu_read_lock(); memcg = folio_memcg(folio); css = cgroup_e_css(memcg->css.cgroup, &io_cgrp_subsys); - bio_associate_blkg_from_css(bio, css); + if (!css || !css_tryget(css)) + css = NULL; rcu_read_unlock(); + + bio_associate_blkg_from_css(bio, css); + if (css) + css_put(css); } #else #define bio_associate_blkg_from_page(bio, folio) do { } while (0) |