From: Linus Walleij <linus.walleij@linaro.org>
To: Alexander Stein <alexander.stein@systec-electronic.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
Alexandre Courbot <gnurou@gmail.com>,
Linux Input <linux-input@vger.kernel.org>
Subject: Re: gpio irqchip initialization race
Date: Fri, 1 Apr 2016 10:47:42 +0200 [thread overview]
Message-ID: <CACRpkdZ32AAq2BfoEeyiBm1RiXQVkTO6gxsEuuMGhm7wuUXxgQ@mail.gmail.com> (raw)
In-Reply-To: <CACRpkdbfidnokJ2WyagdcEycDu3dXKVon2z4TKM7KhNg_Hyf9w@mail.gmail.com>
On Fri, Apr 1, 2016 at 10:43 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
> I think the problem is that gpio-keys is calling gpio_to_irq(), and at that
> point between gpiochip_add_data() but before gpiochip_irqchip_add()
> it gets a bogus IRQ when it should be getting -EPROBE_DEFER.
Or not a bogus irqnumber really, it get -ENXIO (-6)
as in your example:
> gpio-keys user_sw: Unable to get irq number for GPIO 376, error -6
And in this case (if gpio_keys handle -EPROBE_DEFER gracefully)
all should be fine with my oneliner patch.
I am more uncertain about the -EINVAL (-22) we might need some
more analysis there.
Yours,
Linus Walleij
next prev parent reply other threads:[~2016-04-01 8:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <44236018.b6N0xPzKYW@ws-stein>
2016-04-01 8:43 ` gpio irqchip initialization race Linus Walleij
2016-04-01 8:47 ` Linus Walleij [this message]
2016-04-01 8:56 ` Alexander Stein
2016-04-01 11:29 ` Linus Walleij
2016-04-01 12:45 ` Alexander Stein
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