linux-kernel - Re: [patch 18/30] PCI: xilinx-nwl: Use irq_data_get_irq_chip

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Message-ID: <CAL_JsqKCGkyk9whiGQ0hPyWjSYXnC-TSbot85k7=bwVd0rwC=A@mail.gmail.com>
Date:   Thu, 10 Dec 2020 16:56:21 -0600
From:   Rob Herring <robh@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Marc Zyngier <maz@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Michal Simek <michal.simek@...inx.com>,
        PCI <linux-pci@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        afzal mohammed <afzal.mohd.ma@...il.com>,
        linux-parisc@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>, linux-s390@...r.kernel.org,
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Subject: Re: [patch 18/30] PCI: xilinx-nwl: Use irq_data_get_irq_chip_data()

On Thu, Dec 10, 2020 at 1:42 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> Going through a full irq descriptor lookup instead of just using the proper
> helper function which provides direct access is suboptimal.
>
> In fact it _is_ wrong because the chip callback needs to get the chip data
> which is relevant for the chip while using the irq descriptor variant
> returns the irq chip data of the top level chip of a hierarchy. It does not
> matter in this case because the chip is the top level chip, but that
> doesn't make it more correct.
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Michal Simek <michal.simek@...inx.com>
> Cc: linux-pci@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> ---
>  drivers/pci/controller/pcie-xilinx-nwl.c |    8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>