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 <[email protected]> --- 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
