linux-kernel - [PATCH AUTOSEL for 4.14 024/135] powerpc/pseries/vio: Dispose of virq mapping on vdevice unregister

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Date:   Thu, 7 Dec 2017 15:45:35 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 024/135] powerpc/pseries/vio: Dispose of virq
 mapping on vdevice unregister

From: Tyrel Datwyler <tyreld@...ux.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have a virq mapped to a hardware irq that is no longer valid for the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@...ux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 arch/powerpc/platforms/pseries/vio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
index 12277bc9fd9e..d86938260a86 100644
--- 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);
 
-- 
2.11.0