tree 74f389ca722eb54ae5b756ff01e0b2688b41bd69
parent 9dfbf78e4114fcaf4ef61c49885c3ab5bad40d0b
author Benjamin Herrenschmidt <benh@kernel.crashing.org> 1523423879 +1000
committer Michael Ellerman <mpe@ellerman.id.au> 1524062985 +1000

powerpc/xive: Fix trying to "push" an already active pool VP

When setting up a CPU, we "push" (activate) a pool VP for it.

However it's an error to do so if it already has an active
pool VP.

This happens when doing soft CPU hotplug on powernv since we
don't tear down the CPU on unplug. The HW flags the error which
gets captured by the diagnostics.

Fix this by making sure to "pull" out any already active pool
first.

Fixes: 243e25112d06 ("powerpc/xive: Native exploitation of the XIVE interrupt controller")
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>