[ Upstream commit ad092c027713a68a34168942a5ef422e42e039f4 ]
If the specified rcuperf.perf_type is not in the rcu_perf_init() function's perf_ops[] array, rcuperf prints some console messages and then invokes rcu_perf_cleanup() to set state so that a future torture test can run. However, rcu_perf_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_perf_cleanup(), thus avoiding relying on an irrelevant cur_ops value.
Signed-off-by: Paul E. McKenney paulmck@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/rcu/rcuperf.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c index c297611528744..7a6890b23c5f5 100644 --- a/kernel/rcu/rcuperf.c +++ b/kernel/rcu/rcuperf.c @@ -494,6 +494,10 @@ rcu_perf_cleanup(void)
if (torture_cleanup_begin()) return; + if (!cur_ops) { + torture_cleanup_end(); + return; + }
if (reader_tasks) { for (i = 0; i < nrealreaders; i++) @@ -614,6 +618,7 @@ rcu_perf_init(void) pr_cont("\n"); WARN_ON(!IS_MODULE(CONFIG_RCU_PERF_TEST)); firsterr = -EINVAL; + cur_ops = NULL; goto unwind; } if (cur_ops->init)