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rcuperf: Do not wake up shutdown wait queue if "shutdown" is false.

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After finishing its tests rcuperf tries to wake up shutdown_wq even if
"shutdown" param is set to false, resulting in a wake_up() call on an
unitialized wait_queue_head_t which leads to "BUG: spinlock bad magic" and
"BUG: unable to handle kernel NULL pointer dereference".

Fix by checking "shutdown" param before waking up the queue.

Signed-off-by: Artem Savkov <artem.savkov@gmail.com>
This commit is contained in:
Artem Savkov 2016-02-07 13:31:39 +01:00 • committed by Paul E. McKenney
parent dba6f1bab8
commit e6fb1fc108
1 changed files with 4 additions and 2 deletions
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6
kernel/rcu/rcuperf.c
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@ -423,8 +423,10 @@ rcu_perf_writer(void *arg)
b_rcu_perf_writer_finished = b_rcu_perf_writer_finished =
cur_ops->completed(); cur_ops->completed();
} }
smp_mb(); /* Assign before wake. */ if (shutdown) {
wake_up(&shutdown_wq); smp_mb(); /* Assign before wake. */
wake_up(&shutdown_wq);
}
} }
} }
if (done && !alldone && if (done && !alldone &&