CIFS: Fix missing of oplock_read value in smb30_values structure

[profile/ivi/kernel-adaptation-intel-automotive.git] / kernel / cgroup.c

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 4855892..1e23664 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -426,12 +426,20 @@ static void __put_css_set(struct css_set *cg, int taskexit)
                struct cgroup *cgrp = link->cgrp;
                list_del(&link->cg_link_list);
                list_del(&link->cgrp_link_list);
+
+               /*
+                * We may not be holding cgroup_mutex, and if cgrp->count is
+                * dropped to 0 the cgroup can be destroyed at any time, hence
+                * rcu_read_lock is used to keep it alive.
+                */
+               rcu_read_lock();
                if (atomic_dec_and_test(&cgrp->count) &&
                    notify_on_release(cgrp)) {
                        if (taskexit)
                                set_bit(CGRP_RELEASABLE, &cgrp->flags);
                        check_for_release(cgrp);
                }
+               rcu_read_unlock();
 
                kfree(link);
        }