linux-kernel - Re: [PATCH 2/7] PCI: aardvark: Check for virq mapping when processing INTx IRQ

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Message-ID: <20210823163305.okizte3ejnm6ltra@pali>
Date:   Mon, 23 Aug 2021 18:33:05 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>,
        Marek Behún <kabel@...nel.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] PCI: aardvark: Check for virq mapping when
 processing INTx IRQ

On Friday 06 August 2021 09:29:02 Marc Zyngier wrote:
> On 2021-06-25 10:03, Pali Rohár wrote:
> > It is possible that we receive spurious INTx interrupt. So add needed
> > check
> > before calling generic_handle_irq() function.
> > 
> > Signed-off-by: Pali Rohár <pali@...nel.org>
> > Reviewed-by: Marek Behún <kabel@...nel.org>
> > Cc: stable@...r.kernel.org
> > ---
> >  drivers/pci/controller/pci-aardvark.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/pci/controller/pci-aardvark.c
> > b/drivers/pci/controller/pci-aardvark.c
> > index 36fcc077ec72..59f91fad2481 100644
> > --- a/drivers/pci/controller/pci-aardvark.c
> > +++ b/drivers/pci/controller/pci-aardvark.c
> > @@ -1226,7 +1226,11 @@ static void advk_pcie_handle_int(struct advk_pcie
> > *pcie)
> >  			    PCIE_ISR1_REG);
> > 
> >  		virq = irq_find_mapping(pcie->irq_domain, i);
> > -		generic_handle_irq(virq);
> > +		if (virq)
> > +			generic_handle_irq(virq);
> > +		else
> > +			dev_err_ratelimited(&pcie->pdev->dev, "unexpected INT%c IRQ\n",
> > +					    (char)i+'A');
> >  	}
> >  }
> 
> Please use generic_handle_domain_irq() instead of irq_find_mapping()
> and generic_handle_irq().

Ok! At the time when I was sending these patches there was no function
generic_handle_domain_irq().

As all these interrupt related patches are targeting also stable tress
where is no generic_handle_domain_irq() function too, it would be easier
for backporting to use irq_find_mapping() + generic_handle_irq(). And
later after applying all interrupt related patches, include a patch
which converts all usage to generic_handle_domain_irq().

> Thanks,
> 
>         M.
> -- 
> Jazz is not dead. It just smells funny...