[ Upstream commit b813afae7ab6a5e91b4e16cc567331d9c2ae1f04 ]
If the specified rcutorture.torture_type is not in the rcu_torture_init() function's torture_ops[] array, rcutorture prints some console messages and then invokes rcu_torture_cleanup() to set state so that a future torture test can run. However, rcu_torture_cleanup() also attempts to end the test that didn't actually start, and in doing so relies on the value of cur_ops, a value that is not particularly relevant in this case. This can result in confusing output or even follow-on failures due to attempts to use facilities that have not been properly initialized.
This commit therefore sets the value of cur_ops to NULL in this case and inserts a check near the beginning of rcu_torture_cleanup(), thus avoiding relying on an irrelevant cur_ops value.
Reported-by: kernel test robot rong.a.chen@intel.com Signed-off-by: Paul E. McKenney paulmck@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/rcu/rcutorture.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index f6e85faa4ff4b..584b0d1da0a3b 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2092,6 +2092,10 @@ rcu_torture_cleanup(void) cur_ops->cb_barrier(); return; } + if (!cur_ops) { + torture_cleanup_end(); + return; + }
rcu_torture_barrier_cleanup(); torture_stop_kthread(rcu_torture_fwd_prog, fwd_prog_task); @@ -2257,6 +2261,7 @@ rcu_torture_init(void) pr_cont("\n"); WARN_ON(!IS_MODULE(CONFIG_RCU_TORTURE_TEST)); firsterr = -EINVAL; + cur_ops = NULL; goto unwind; } if (cur_ops->fqs == NULL && fqs_duration != 0) {