powerpc/xive: Ensure active irqd when setting affinity
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 2 Aug 2017 01:54:41 +0000 (20:54 -0500)
committerMichael Ellerman <mpe@ellerman.id.au>
Thu, 10 Aug 2017 12:30:03 +0000 (22:30 +1000)
commitcffb717ceb8e2ca0316e89d908db54af454f1fbb
treeed14dec2e27bd052e0da7241af8ae99bb21af918
parent04019bf8ebb3c8cd66d75046054aeb264ba2db54
powerpc/xive: Ensure active irqd when setting affinity

Ensure irqd is active before attempting to set affinity. This should
make the set affinity code more robust. For instance, this prevents
these messages seen on a 4.12 based kernel when taking cpus offline:

   [  123.053037264,3] XIVE[ IC 00  ] ISN 2 lead to invalid IVE !
   [   77.885859] xive: Error -6 reconfiguring irq 17
   [   77.885862] IRQ17: set affinity failed(-6).

That particular case has been fixed in 4.13-rc1 by commit
91f26cb4cd3c ("genirq/cpuhotplug: Do not migrated shutdown irqs").

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/sysdev/xive/common.c