linux-kernel - Re: [PATCH v8 3/4] gpiolib: add irq_not_threaded flag to gpio

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Message-ID: <CAAVeFuJ4B37YgvTBctXqmtWJtg3b19PDt1EEZF5Rc6KVXZzUtw@mail.gmail.com>
Date:	Mon, 20 Oct 2014 14:08:38 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Johan Hovold <johan@...nel.org>,
	daniel.baluta@...el.com, laurentiu.palcu@...el.com,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH v8 3/4] gpiolib: add irq_not_threaded flag to gpio_chip

On Wed, Oct 15, 2014 at 11:48 PM, Octavian Purdila
<octavian.purdila@...el.com> wrote:
> Some GPIO chips (e.g. the DLN2 USB adapter) have blocking get/set
> operation but do not need a threaded irq handler.

Sorry if you already explained this (I have been a little bit late
with the GPIO reviews recently), but does this optimization bring a
significant benefit that justifies adding another field in struct
gpio_chip? If so it would be nice to have it in the commit message. If
not, do we need this at all?
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