linux-kernel - Re: [PATCH] gpio: vf610: handle level IRQ's properly

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Date:	Wed, 26 Aug 2015 10:11:25 -0700
From:	Stefan Agner <stefan@...er.ch>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Alexandre Courbot <gnurou@...il.com>, linux-gpio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: vf610: handle level IRQ's properly

On 2015-08-26 05:47, Linus Walleij wrote:
> On Sat, Aug 22, 2015 at 12:56 AM, Stefan Agner <stefan@...er.ch> wrote:
> 
>> The GPIO IRQ controller is able to generate level triggered
>> interrupts, however, these were handled by handle_simple_irq so far
>> which did not take care of IRQ masking. This lead to "nobody cared
>> (try booting with the "irqpoll" option)" stack traces.
>>
>> Use the generic interrupt handlers depending on the IRQ type.
>>
>> Signed-off-by: Stefan Agner <stefan@...er.ch>
> 
> Patch applied.

Thx

 
> Hm, this looks like a problem that could exist in a few more
> GPIO drivers. Can you look around and see if there is something
> immediately suspicious in drivers/gpio?

Just looked a bit around. There are some which use handle_simple_irq but
also run their handler in threaded/one-shot handler. I guess in that
case it is fine to use the simple_irq handler.

However, those GPIO drivers look suspicious:

gpio-altera.c: Uses handle_simple_irq, supports edge and level
gpio-bcm-kona.c: Uses handle_simple_irq, supports only edge
gpio-grgpio.c: Uses handle_simple_irq, supports edge and level
gpio-intel-mid.c: Uses handle_simple_irq, supports only edge
gpio-lynxpoint.c: Uses handle_simple_irq, supports edge and level
gpio-ml-ioh.c: Uses handle_simple_irq, supports edge and level
gpio-pl061.c: Uses handle_simple_irq, supports edge and level
gpio-rcar.c: Uses handle_level_irq, supports edge and level
gpio-timberdale.c: Uses handle_simple_irq, supports edge and level

--
Stefan
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