linux-kernel - [PATCH] virtio-pci: Remove affinity hint before freeing the interrupt

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Message-Id: <20170308080927.4493-1-marc.zyngier@arm.com>
Date:   Wed,  8 Mar 2017 08:09:27 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] virtio-pci: Remove affinity hint before freeing the interrupt

virtio-pci registers a per-vq affinity hint when using MSIX,
but fails to remove it when freeing the interrupt, resulting
in this type of splat:

[   31.111202] WARNING: CPU: 0 PID: 2823 at kernel/irq/manage.c:1503 __free_irq+0x2c4/0x2c8
[   31.114689] Modules linked in:
[   31.116101] CPU: 0 PID: 2823 Comm: kexec Not tainted 4.10.0+ #6941
[   31.118911] Hardware name: Generic DT based system
[   31.121319] [<c022fb78>] (unwind_backtrace) from [<c0229d8c>] (show_stack+0x18/0x1c)
[   31.125017] [<c0229d8c>] (show_stack) from [<c05192f4>] (dump_stack+0x84/0x98)
[   31.128427] [<c05192f4>] (dump_stack) from [<c023d940>] (__warn+0xf4/0x10c)
[   31.131910] [<c023d940>] (__warn) from [<c023da20>] (warn_slowpath_null+0x28/0x30)
[   31.135543] [<c023da20>] (warn_slowpath_null) from [<c0290238>] (__free_irq+0x2c4/0x2c8)
[   31.139355] [<c0290238>] (__free_irq) from [<c02902d0>] (free_irq+0x44/0x78)
[   31.142909] [<c02902d0>] (free_irq) from [<c059d3a8>] (vp_del_vqs+0x68/0x1c0)
[   31.146299] [<c059d3a8>] (vp_del_vqs) from [<c056ca4c>] (pci_device_shutdown+0x3c/0x78)

The obvious fix is to drop the affinity hint before freeing the
interrupt.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 drivers/virtio/virtio_pci_common.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index df548a6fb844..5a84f8207c02 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -106,9 +106,12 @@ static void vp_remove_vqs(struct virtio_device *vdev)
 		if (vp_dev->msix_vector_map) {
 			int v = vp_dev->msix_vector_map[vq->index];
 
-			if (v != VIRTIO_MSI_NO_VECTOR)
-				free_irq(pci_irq_vector(vp_dev->pci_dev, v),
-					vq);
+			if (v != VIRTIO_MSI_NO_VECTOR) {
+				unsigned int irq;
+				irq = pci_irq_vector(vp_dev->pci_dev, v);
+				irq_set_affinity_hint(irq, NULL);
+				free_irq(irq, vq);
+			}
 		}
 		vp_dev->del_vq(vq);
 	}
-- 
2.11.0