From: Tim Harvey <tharvey@gateworks.com>
To: Thomas Gleixner <tglx@linutronix.de>, Lokesh Vutla <lokeshvutla@ti.com>
Cc: Nishanth Menon <nm@ti.com>,
Peter Ujfalusi <peter.ujfalusi@ti.com>,
Grygorii Strashko <grygorii.strashko@ti.com>,
Jason Cooper <jason@lakedaemon.net>,
Device Tree Mailing List <devicetree@vger.kernel.org>,
Marc Zyngier <marc.zyngier@arm.com>,
Linus Walleij <linus.walleij@linaro.org>,
Sekhar Nori <nsekhar@ti.com>,
open list <linux-kernel@vger.kernel.org>,
Tero Kristo <t-kristo@ti.com>, Tony Lindgren <tony@atomide.com>,
Rob Herring <robh+dt@kernel.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
Santosh Shilimkar <ssantosh@kernel.org>,
Linux ARM Mailing List <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v8 07/14] gpio: thunderx: Use the default parent apis for {request, release}_resources
Date: Wed, 11 Mar 2020 09:09:43 -0700 [thread overview]
Message-ID: <CAJ+vNU2agPYq+Y3kXG40wcfUzA9q-27Cdvqj7gLT2o6RKCQK5Q@mail.gmail.com> (raw)
In-Reply-To: <87zhcmkicp.fsf@nanos.tec.linutronix.de>
On Wed, Mar 11, 2020 at 8:43 AM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> Tim,
>
> Tim Harvey <tharvey@gateworks.com> writes:
> > On Tue, Apr 30, 2019 at 3:14 AM Lokesh Vutla <lokeshvutla@ti.com> wrote:
> >> - if (parent_data && parent_data->chip->irq_request_resources) {
> >> - r = parent_data->chip->irq_request_resources(parent_data);
> >> - if (r)
> >> - goto error;
> >> - }
> >> + r = irq_chip_request_resources_parent(data);
> >> + if (r)
> >> + gpiochip_unlock_as_irq(&txgpio->chip, txline->line);
> >
> > This patch breaks irq resources for thunderx-gpio as
> > parent_data->chip->irq_request_resources is undefined thus your new
> > irq_chip_request_resources_parent() returns -ENOSYS causing this
> > function to return an error where as before it would happily return 0.
> >
> > Is the following the correct fix or should we qualify
> > data->parent_data->chip->irq_request_resources before calling
> > irq_chip_request_resources_parent() in thunderx-gpio?
>
> You are not supposed to fiddle with parent data at all. Just because C
> allows you is no excuse to violate abstractions in the first place.
>
> irq_chip_request_resources_parent() rightfully returns -ENOSYS when it
> can't request a resource from the parent chip because that chip does not
> have anything to offer.
>
> It's up to the caller to do something sensible with the return code. If
> your chip is happy with the parent not providing it then handle
> -ENOSYS. None of the chip callbacks should return -ENOSYS. If one does
> then that wants to be fixed.
>
Ok, makes sense. Thank you and Lokesh for the feedback. I just
submitted a patch to fix the thunderx-gpio breakage.
Best Regards,
Tim
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next prev parent reply other threads:[~2020-03-11 16:10 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 10:12 [PATCH v8 00/14] Add support for TISCI Interrupt controller drivers Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 01/14] firmware: ti_sci: Add support to get TISCI handle using of_phandle Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 02/14] firmware: ti_sci: Add support for RM core ops Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 03/14] firmware: ti_sci: Add support for IRQ management Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 04/14] firmware: ti_sci: Add RM mapping table for am654 Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 05/14] firmware: ti_sci: Add helper apis to manage resources Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 06/14] genirq: Introduce irq_chip_{request, release}_resource_parent() apis Lokesh Vutla
2019-05-16 12:40 ` Linus Walleij
2019-04-30 10:12 ` [PATCH v8 07/14] gpio: thunderx: Use the default parent apis for {request, release}_resources Lokesh Vutla
2020-03-10 23:27 ` Tim Harvey
2020-03-11 4:56 ` [PATCH v8 07/14] gpio: thunderx: Use the default parent apis for {request,release}_resources Lokesh Vutla
2020-03-11 15:43 ` [PATCH v8 07/14] gpio: thunderx: Use the default parent apis for {request, release}_resources Thomas Gleixner
2020-03-11 16:09 ` Tim Harvey [this message]
2019-04-30 10:12 ` [PATCH v8 08/14] dt-bindings: irqchip: Introduce TISCI Interrupt router bindings Lokesh Vutla
2019-04-30 22:24 ` Rob Herring
2019-04-30 10:12 ` [PATCH v8 09/14] irqchip: ti-sci-intr: Add support for Interrupt Router driver Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 10/14] dt-bindings: irqchip: Introduce TISCI Interrupt Aggregator bindings Lokesh Vutla
2019-04-30 22:25 ` Rob Herring
2019-04-30 10:12 ` [PATCH v8 11/14] irqchip: ti-sci-inta: Add support for Interrupt Aggregator driver Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 12/14] soc: ti: Add MSI domain bus support for Interrupt Aggregator Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 13/14] irqchip: ti-sci-inta: Add msi domain support Lokesh Vutla
2019-04-30 10:12 ` [PATCH v8 14/14] arm64: arch_k3: Enable interrupt controller drivers Lokesh Vutla
2019-04-30 11:45 ` [PATCH v8 00/14] Add support for TISCI Interrupt " Nishanth Menon
2019-05-01 11:58 ` Marc Zyngier
2019-05-01 13:23 ` Lokesh Vutla
2019-05-01 13:45 ` Marc Zyngier
2019-05-01 14:04 ` Tony Lindgren
2019-05-01 14:31 ` Marc Zyngier
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