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rcutorture: Don't cpuhp_remove_state() if cpuhp_setup_state() failed

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[ Upstream commit fd13fe16db ]

Currently, in CONFIG_RCU_BOOST kernels, if the rcu_torture_init()
function's call to cpuhp_setup_state() fails, rcu_torture_cleanup()
gamely passes nonsense to cpuhp_remove_state().  This results in
strange and misleading splats.  This commit therefore ensures that if
the rcu_torture_init() function's call to cpuhp_setup_state() fails,
rcu_torture_cleanup() avoids invoking cpuhp_remove_state().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-08-06 08:57:26 -07:00 committed by Greg Kroah-Hartman
parent 5a6ff3e32a
commit 489b93ac63
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/rcutorture.c
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@ -2848,7 +2848,7 @@ rcu_torture_cleanup(void)
rcutorture_seq_diff(gp_seq, start_gp_seq));
torture_stop_kthread(rcu_torture_stats, stats_task);
torture_stop_kthread(rcu_torture_fqs, fqs_task);
if (rcu_torture_can_boost())
if (rcu_torture_can_boost() && rcutor_hp >= 0)
cpuhp_remove_state(rcutor_hp);
/*
@ -3161,9 +3161,9 @@ rcu_torture_init(void)
firsterr = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "RCU_TORTURE",
rcutorture_booster_init,
rcutorture_booster_cleanup);
rcutor_hp = firsterr;
if (torture_init_error(firsterr))
goto unwind;
rcutor_hp = firsterr;
// Testing RCU priority boosting requires rcutorture do
// some serious abuse. Counter this by running ksoftirqd