linux-kernel - Re: [patch 33/37] iommu/arm-smmu-v3: Use msi_get

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Date:   Tue, 30 Nov 2021 13:30:53 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>
Cc:     Nishanth Menon <nm@...com>, Mark Rutland <mark.rutland@....com>,
        Stuart Yoder <stuyoder@...il.com>, linux-pci@...r.kernel.org,
        Ashok Raj <ashok.raj@...el.com>, Marc Zygnier <maz@...nel.org>,
        x86@...nel.org, Sinan Kaya <okaya@...nel.org>,
        iommu@...ts.linux-foundation.org,
        Bjorn Helgaas <helgaas@...nel.org>,
        Megha Dey <megha.dey@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Tero Kristo <kristo@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org
Subject: Re: [patch 33/37] iommu/arm-smmu-v3: Use msi_get_virq()

On Tue, Nov 30 2021 at 09:36, Will Deacon wrote:
> On Mon, Nov 29, 2021 at 02:54:18PM +0000, Robin Murphy wrote:
>> On 2021-11-29 14:42, Thomas Gleixner wrote:
>> > It's actually 0 when the vector cannot be found.
>> 
>> Oh, -1 for my reading comprehension but +1 for my confidence in the patch
>> then :)
>> 
>> I'll let Will have the final say over how cautious we really want to be
>> here, but as far as I'm concerned it's a welcome cleanup as-is. Ditto for
>> patch #32 based on the same reasoning, although I don't have a suitable test
>> platform on-hand to sanity-check that one.
>
> If, as it appears, msi_get_virq() isn't going to fail meaningfully after
> we've successfully called platform_msi_domain_alloc_irqs() then it sounds
> like the patch is fine. Just wanted to check though, as Spring cleaning at
> the end of November raised an eyebrow over here :)

Fair enough. Next time I'll name it 'Cleaning the Augean stables' when
it's the wrong season.

Thanks,

        tglx