1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index a4077e90f19f..40b76e351e64 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1263,6 +1263,10 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
         struct sighand_struct *sighand;
 
         for (;;) {
+                /*
+                 * Disable interrupts early to avoid deadlocks.
+                 * See rcu_read_unlock() comment header for details.
+                 */
                 local_irq_save(*flags);
                 rcu_read_lock();
                 sighand = rcu_dereference(tsk->sighand);