[PATCH 0/4] padata/pcrypt: fixes

[Steffen Klassert]

This patchset contains the following fixes:

1. padata - Fix a potential hang of the parallel worker threads on
cpu hotplug.

2. padata - Fix two NULL pointer dereference crashes if one of the
padata cpumasks is empty. The crashes can be triggered by doing
echo 0 > /sys/kernel/pcrypt/pencrypt/[parallel_cpumask/serial_cpumask]

3. padata - Fix a division by zero crash if the parallel cpumask
contains no active cpu. Can be triggered by doing
echo 0 > /sys/kernel/pcrypt/pencrypt/parallel_cpumask

4. pcrypt - Fix division by zero crash if the callback cpumask
is empty. Can be triggered by doing
echo 0 > /sys/kernel/pcrypt/pencrypt/serial_cpumask

I ran a script that does cpumask changes and cpu hotplugs as fast as
possible while sending IPsec packets on maximal rate with pcrypt.
It showed no furter crashes overnight, so I hope I've got them all.

padata API corrections and some minor fixes/cleanups are comming later.

Steffen
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