[PATCH 0/4] PM / Domains: Fix race conditions during boot

[Ulf Hansson <ulf.hansson@linaro.org>]

When there are more than one device in a PM domain these will obviously
be probed at different times. Depending on timing and the implemented
support for runtime PM in a driver/subsystem, genpd may be advised to
power off a PM domain after a successful probe sequence.
    
Ideally we should have relied on the driver/subsystem, through runtime
PM, to bring their device's PM domain into powered state prior doing
probing if such requirement exist.
    
Since this is not a common practice by drivers/subsystems, enforcing
such a change doesn't seem viable.
    
Instead, let's improve the situation, by preventing genpd from powering
off any of the PM domains until late_init. At that point genpd already
tries to power off unused PM domains, so it seems like a decent match.
    
Cases which can't be covered within the window of until late_init needs
to be adressed separately and likely through a more common long term
solution.


Ulf Hansson (4):
  PM / Domains: Remove pm_genpd_dev_need_restore() API
  ARM: exynos: Ensure PM domains are powered at initialization
  PM / Domains: Expect PM domains being powered at initialization
  PM / Domains: Enforce PM domains to stay powered during boot

 arch/arm/mach-exynos/pm_domains.c   |  7 ++++---
 arch/arm/mach-s3c64xx/pm.c          |  4 ++--
 arch/arm/mach-shmobile/pm-r8a7779.c |  2 +-
 arch/arm/mach-shmobile/pm-rmobile.c |  2 +-
 drivers/base/power/domain.c         | 42 ++++++++++++++++---------------------
 include/linux/pm_domain.h           |  7 +++----
 6 files changed, 29 insertions(+), 35 deletions(-)

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1.9.1