This is a note to let you know that I've just added the patch titled

powerpc/pseries/vio: Dispose of virq mapping on vdevice unregister

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: powerpc-pseries-vio-dispose-of-virq-mapping-on-vdevice-unregister.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Mon Dec 18 13:28:59 CET 2017

From: Tyrel Datwyler tyreld@linux.vnet.ibm.com Date: Thu, 28 Sep 2017 20:19:20 -0400 Subject: powerpc/pseries/vio: Dispose of virq mapping on vdevice unregister

From: Tyrel Datwyler tyreld@linux.vnet.ibm.com

[ Upstream commit b8f89fea599d91e674497aad572613eb63181f31 ]

When a vdevice is DLPAR removed from the system the vio subsystem doesn't bother unmapping the virq from the irq_domain. As a result we have a virq mapped to a hardware irq that is no longer valid for the irq_domain. A side effect is that we are left with /proc/irq/<irq#> affinity entries, and attempts to modify the smp_affinity of the irq will fail.

In the following observed example the kernel log is spammed by ics_rtas_set_affinity errors after the removal of a VSCSI adapter. This is a result of irqbalance trying to adjust the affinity every 10 seconds.

rpadlpar_io: slot U8408.E8E.10A7ACV-V5-C25 removed ics_rtas_set_affinity: ibm,set-xive irq=655385 returns -3 ics_rtas_set_affinity: ibm,set-xive irq=655385 returns -3

This patch fixes the issue by calling irq_dispose_mapping() on the virq of the viodev on unregister.

Fixes: f2ab6219969f ("powerpc/pseries: Add PFO support to the VIO bus") Signed-off-by: Tyrel Datwyler tyreld@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/platforms/pseries/vio.c | 2 ++ 1 file changed, 2 insertions(+)

--- a/arch/powerpc/platforms/pseries/vio.c +++ b/arch/powerpc/platforms/pseries/vio.c @@ -1592,6 +1592,8 @@ ATTRIBUTE_GROUPS(vio_dev); void vio_unregister_device(struct vio_dev *viodev) { device_unregister(&viodev->dev); + if (viodev->family == VDEVICE) + irq_dispose_mapping(viodev->irq); } EXPORT_SYMBOL(vio_unregister_device);

Patches currently in stable-queue which might be from tyreld@linux.vnet.ibm.com are

queue-4.14/powerpc-pseries-vio-dispose-of-virq-mapping-on-vdevice-unregister.patch