crypto: N2 - Replace racy task affinity logic

spu_queue_register() needs to invoke setup functions on a particular
CPU. This is achieved by temporarily setting the affinity of the
calling user space thread to the requested CPU and reset it to the original
affinity afterwards.

That's racy vs. CPU hotplug and concurrent affinity settings for that
thread resulting in code executing on the wrong CPU and overwriting the
new affinity setting.

Replace it by using work_on_cpu_safe() which guarantees to run the code on
the requested CPU or to fail in case the CPU is offline.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Herbert Xu <[email protected]>
Acked-by: "David S. Miller" <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Sebastian Siewior <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Viresh Kumar <[email protected]>
Cc: [email protected]
Cc: Michael Ellerman <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Len Brown <[email protected]>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1704131019420.2408@nanos
Signed-off-by: Thomas Gleixner <[email protected]>

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