linux-kernel - Re: [PATCH] gpio: pca953x: fix irq_domain_add

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Message-ID: <CACRpkdY=gJMCQ-qskDwXFg9cQH02+fZ00zU+=2cRdHE71cT9hw@mail.gmail.com>
Date:	Wed, 10 Apr 2013 22:54:31 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>, jimwall@...om,
	brian@...stalfontz.com,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: pca953x: fix irq_domain_add_simple usage

On Wed, Apr 3, 2013 at 7:40 PM, Alexandre Belloni
<alexandre.belloni@...e-electrons.com> wrote:

> We actually have to pass chip as the host_data parameter of
> irq_domain_add_simple() as later on, it is used to initialize chip_data
> in pca953x_gpio_irq_map(). Failing to do so is leading to a NULL pointer
> dereference after calling irq_data_get_irq_chip_data() in
> pca953x_irq_mask(), pca953x_irq_unmask(), pca953x_irq_bus_lock(),
> pca953x_irq_bus_sync_unlock() and pca953x_irq_set_type().
>
> Fixes regression introduced by commit
> 0e8f2fdacf1d44651aa7e57063c76142d1f4988b (gpio: pca953x: use simple
> irqdomain)
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> ---
>
> This would probably be good to introduce that patch in the next 3.9 rc as the
> regression leads to a lot of breakage (and cursing).

OK patch applied let's see if I get it to Torvalds in time.

Can I have some ACK from Maxime?

Yours,
Linus Walleij
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