[PATCH 00/10] intel_idle: Fix hot plug handling.

[Richard Cochran]

This driver has one serious and one mild bug in its hot plug handling.

First, whenever a new CPU goes on line, if the call to
cpuidle_register_driver() should fail (say, due to lack of memory),
then the driver frees its per-CPU region.  On the *next* CPU_ONLINE
event, the driver will happily use the region again and even free it
again if the failure repeats.

Second, for each new on line CPU, a device is registered with the
cpuidle layer.  However, when a CPU goes down, its device is never
unregistered, even if the module exits.

Although this driver may not (yet?) be a built as a module, still this
patch series cleans up the exit path in order to make the resource
allocations clear.


Richard Cochran (10):
  intel_idle: remove useless return from void function.
  intel_idle: Fix a helper function's return value.
  intel_idle: Remove redundant initialization calls.
  intel_idle: Fix deallocation order on the driver exit path.
  intel_idle: Fix dangling registration on error path.
  intel_idle: Avoid a double free of the per-CPU data.
  intel_idle: Setup the timer broadcast only on successful driver load.
  intel_idle: Don't overreact to a cpuidle registration failure.
  intel_idle: Propagate hot plug errors.
  intel_idle: Clean up all registered devices on exit.

 drivers/idle/intel_idle.c | 61 ++++++++++++++++++++++++-----------------------
 1 file changed, 31 insertions(+), 30 deletions(-)

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2.1.4