[PATCH 0/2] PM: cpu: Restore the RCU grace period to cpu_pm_unregister_notifier()

[Bradley Morgan]

Since commit b2f6662ac08d ("PM: cpu: Make notifier chain use a
raw_spinlock_t") cpu_pm_unregister_notifier() no longer waits for an
RCU grace period, but cpu_pm_notify() still walks the chain with only
rcu_read_lock() held. A driver that frees its notifier block right
after unregistering can race with a concurrent walker.

Patch 1 moves the one caller that unregisters from atomic context out
from under its spinlock, patch 2 restores the grace period.

Bradley Morgan (2):
  clocksource/drivers/timer-ti-dm: Unregister CPU PM notifier outside of
    the timer lock
  PM: cpu: Restore synchronize_rcu() to cpu_pm_unregister_notifier()

 drivers/clocksource/timer-ti-dm.c | 9 ++++++---
 kernel/cpu_pm.c                   | 9 ++++++++-
 2 files changed, 14 insertions(+), 4 deletions(-)

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2.47.3