On Thu, 7 Mar 2024 08:39:16 +0000
"Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:
> > From: Alex Williamson <alex.williamson@xxxxxxxxxx>
> > Sent: Thursday, March 7, 2024 5:15 AM
> >
> > Currently for devices requiring masking at the irqchip for INTx, ie.
> > devices without DisINTx support, the IRQ is enabled in request_irq()
> > and subsequently disabled as necessary to align with the masked status
> > flag. This presents a window where the interrupt could fire between
> > these events, resulting in the IRQ incrementing the disable depth twice.
> > This would be unrecoverable for a user since the masked flag prevents
> > nested enables through vfio.
> >
> > Instead, invert the logic using IRQF_NO_AUTOEN such that exclusive INTx
> > is never auto-enabled, then unmask as required.
> >
> > Fixes: 89e1f7d4c66d ("vfio: Add PCI device driver")
> > Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
>
> CC stable?
I've always found that having a Fixes: tag is sufficient to get picked
up for stable, so I typically don't do both. If it helps out someone's
process I'd be happy to though. Thanks,
Alex
