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Date: Wed, 3 Nov 2010 14:03:52 -0700 From: Tom Lyon <pugs@...co.com> To: Alex Williamson <alex.williamson@...hat.com> Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, kvm@...r.kernel.org Subject: Re: [PATCH] vfio: Fix PCI 2.3 shared interrupt Applied. On Wednesday, November 03, 2010 01:17:33 pm Alex Williamson wrote: > Trying to be too clever with setting the irq_disabled flag. PCI 2.3 > disabled devices can still share IRQs, which can lead to clearing > the irq_disabled flag, preventing the EOI from registering, and leaving > the device without interrupts. Interrupt handler should only ever > set irq_disabled and we can exit earlier to avoid the config space > access if we know we're disabled. > > Signed-off-by: Alex Williamson <alex.williamson@...hat.com> > --- > > drivers/vfio/vfio_intrs.c | 9 ++++++++- > 1 files changed, 8 insertions(+), 1 deletions(-) > > diff --git a/drivers/vfio/vfio_intrs.c b/drivers/vfio/vfio_intrs.c > index 604082c..73e3deb 100644 > --- a/drivers/vfio/vfio_intrs.c > +++ b/drivers/vfio/vfio_intrs.c > @@ -57,6 +57,12 @@ irqreturn_t vfio_interrupt(int irq, void *dev_id) > > spin_lock_irq(&vdev->irqlock); > > + /* INTX disabled interrupts can still be shared */ > + if (vdev->irq_disabled) { > + spin_unlock_irq(&vdev->irqlock); > + return ret; > + } > + > if (vdev->pci_2_3) { > pci_block_user_cfg_access(pdev); > > @@ -87,7 +93,8 @@ done: > ret = IRQ_HANDLED; > } > > - vdev->irq_disabled = (ret == IRQ_HANDLED); > + if (ret == IRQ_HANDLED) > + vdev->irq_disabled = true; > > spin_unlock_irq(&vdev->irqlock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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