linux-kernel - Re: [PATCH] pinctrl: samsung: fix segfault when using external interrupts on s3c24xx

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Date:   Thu, 9 Mar 2017 14:56:37 +0900
From:   Tomasz Figa <tomasz.figa@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Sergio Prado <sergio.prado@...abworks.com>,
        Kukjin Kim <kgene@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: samsung: fix segfault when using external
 interrupts on s3c24xx

2017-03-09 1:34 GMT+09:00 Krzysztof Kozlowski <krzk@...nel.org>:
> On Mon, Mar 06, 2017 at 09:15:16AM -0400, Sergio Prado wrote:
>> Hi Krzysztof,
>>
>> > > This is a regression from commit 8b1bd11c1f8f529057369c5b3702d13fd24e2765.
>> >
>> > Checkpatch should complain here about commit format.
>> >
>> > >
>> > > Tested on FriendlyARM mini2440.
>> > >
>> >
>> > Please add:
>> >   Fixes: 8b1bd11c1f8f ("pinctrl: samsung: Add the support the multiple IORESOURCE_MEM for one pin-bank")
>> >   Cc: <stable@...r.kernel.org>
>> >
>>
>> OK.
>>
>> > > Signed-off-by: Sergio Prado <sergio.prado@...abworks.com>
>> > > ---
>> > >  drivers/pinctrl/samsung/pinctrl-s3c24xx.c | 4 ++--
>> > >  1 file changed, 2 insertions(+), 2 deletions(-)
>> > >
>> > > diff --git a/drivers/pinctrl/samsung/pinctrl-s3c24xx.c b/drivers/pinctrl/samsung/pinctrl-s3c24xx.c
>> > > index b82a003546ae..1b8d887796e8 100644
>> > > --- a/drivers/pinctrl/samsung/pinctrl-s3c24xx.c
>> > > +++ b/drivers/pinctrl/samsung/pinctrl-s3c24xx.c
>> > > @@ -356,8 +356,8 @@ static inline void s3c24xx_demux_eint(struct irq_desc *desc,
>> > >  {
>> > >   struct s3c24xx_eint_data *data = irq_desc_get_handler_data(desc);
>> > >   struct irq_chip *chip = irq_desc_get_chip(desc);
>> > > - struct irq_data *irqd = irq_desc_get_irq_data(desc);
>> > > - struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
>> > > + struct samsung_pinctrl_drv_data *d = data->drvdata;
>> > > + struct samsung_pin_bank *bank = d->pin_banks;
>> >
>> > I think 'pin_banks' point to all banks of given controller not to the
>> > currently accessed one.
>>
>> Understood. I think it worked in my tests because on s3c2440 all banks
>> have the same eint base address.
>>
>> So what do you think is the best approach to solve this problem?
>
> Maybe you can get to this through:
>         s3c24xx_eint_domain_data = s3c24xx_eint_data->domains[virq].host_data;
>         s3c24xx_eint_domain_data->bank
>
> It is getting slightly more complicated...

How about the suggestions I made in my reply from March 4 (JST)?

Best regards,
Tomasz