linux-kernel - Re: [PATCH v2] pinctrl: baytrail: lock IRQs when starting them

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Date:	Wed, 4 Dec 2013 12:57:18 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Stephen Warren <swarren@...dia.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v2] pinctrl: baytrail: lock IRQs when starting them

On Tue, Dec 03, 2013 at 06:02:18PM +0200, Mathias Nyman wrote:
> On 12/03/2013 05:00 PM, Linus Walleij wrote:
> >This uses the new API for tagging GPIO lines as in use by
> >IRQs. This enforces a few semantic checks on how the underlying
> >GPIO line is used.
> >
> >Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> >Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> >Cc: Mathias Nyman <mathias.nyman@...ux.intel.com>
> >Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> >---
> >ChangeLog v1->v2:
> >- Actually make the change compile, doh.
> >---
> >  drivers/pinctrl/pinctrl-baytrail.c | 22 ++++++++++++++++++++++
> >  1 file changed, 22 insertions(+)
> >
> >diff --git a/drivers/pinctrl/pinctrl-baytrail.c b/drivers/pinctrl/pinctrl-baytrail.c
> >index 1174ea86b6e9..998dbb0c4c93 100644
> >--- a/drivers/pinctrl/pinctrl-baytrail.c
> >+++ b/drivers/pinctrl/pinctrl-baytrail.c
> >@@ -372,11 +372,33 @@ static void byt_irq_mask(struct irq_data *d)
> >  {
> >  }
> >
> >+static unsigned int byt_irq_startup(struct irq_data *d)
> >+{
> >+	struct byt_gpio *vg = irq_data_get_irq_handler_data(d);
> 
> This should probably be:
> 
> struct byt_gpio *vg = irq_data_get_irq_chip_data(d);
> 
> As chip methods use irq_data->chip_data, not irq_data->handler_data
> (Mika tested that it works on baytrail)

Yes, if it uses irq_data_get_irq_handler_data() I get NULL vg pointer and
the kernel crashes. Using irq_data_get_irq_chip_data() makes it work.
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