[PATCH] powerpc/xive: discard ESB load value when interrupt is invalid

[Greg Kurz]

On Tue, 14 Jan 2020 08:44:54 +0100
Cédric Le Goater <clg at kaod.org> wrote:

> On 1/14/20 2:14 AM, Michael Ellerman wrote:
> > Cédric Le Goater <clg at kaod.org> writes:
> >> On 1/13/20 2:01 PM, Cédric Le Goater wrote:
> >>> From: Frederic Barrat <fbarrat at linux.ibm.com>
> >>>
> >>> A load on an ESB page returning all 1's means that the underlying
> >>> device has invalidated the access to the PQ state of the interrupt
> >>> through mmio. It may happen, for example when querying a PHB interrupt
> >>> while the PHB is in an error state.
> >>>
> >>> In that case, we should consider the interrupt to be invalid when
> >>> checking its state in the irq_get_irqchip_state() handler.
> >>
> >>
> >> and we need also these tags :
> >>
> >> Fixes: da15c03b047d ("powerpc/xive: Implement get_irqchip_state method for XIVE to fix shutdown race")
> >> Cc: stable at vger.kernel.org # v5.3+
> > 
> > I added those, although it's v5.4+, as the offending commit was first
> > included in v5.4-rc1.
> 
> Ah yes. I mistook the merge tag of the branch used for the PR (v5.3-rc2)
> 

You might want to use 'git tag --contains':

[greg at bahia kernel-linus]$ git tag --contains da15c03b047d
for-linus
kvm-5.4-2
next-20191118
next-20191126
tags/kvm-5.4-1
tags/kvm-5.4-2
v5.4
v5.4-rc1
v5.4-rc2
v5.4-rc3
v5.4-rc4
v5.4-rc5
v5.4-rc6
v5.4-rc7
v5.4-rc8
v5.5-rc1

> Thanks,
> 
> C. 
>