[PATCH 0/2] PM / sleep: prohibit devices probing during suspend/hibernation

[Grygorii Strashko]

The main goal of this patchset is to ensure that devices probing will not
happen during system transition to low power states like suspend or
hibernation, because it is unsafe [1] and system behavior will be
unpredictable in this case (for example: after successful probe the device
potentially has a different set of PM callbacks than before [2]).

Tested on dra7-evm using a simple kernel module which only does 
msleep(5000) in its probe.
Test cmd: insmod test_probe.ko & echo mem > sys/power/state
 - suspend will wait for test_probe to finish

[1] https://lkml.org/lkml/2015/9/11/554
[2] https://lkml.org/lkml/2015/9/15/1039
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Grygorii Strashko (2):
  PM / sleep: ensure deferred probe workqueue is finished in wait_for_device_probe
  PM / sleep: prohibit devices probing during suspend/hibernation

 drivers/base/base.h       |  1 +
 drivers/base/dd.c         | 39 ++++++++++++++++++++++++++++++++++++++-
 drivers/base/power/main.c | 13 +++++++++++++
 3 files changed, 52 insertions(+), 1 deletion(-)

-- 
2.5.1

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