linux-kernel - RE: [PATCH] gpio: samsung: Fix off-by-one bug in gpio addresses

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Date:	Mon, 30 Jul 2012 17:04:47 +0900
From:	박상수 <sangsu4u.park@...sung.com>
To:	'Doug Anderson' <dianders@...omium.org>,
	'Sean Paul' <seanpaul@...omium.org>
Cc:	grant.likely@...retlab.ca, linus.walleij@...ricsson.com,
	linux-kernel@...r.kernel.org, olofj@...omium.org,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Kukjin Kim' <kgene.kim@...sung.com>
Subject: RE: [PATCH] gpio: samsung: Fix off-by-one bug in gpio addresses



> -----Original Message-----
> From: dianders@...gle.com [mailto:dianders@...gle.com] On Behalf Of Doug Anderson
> Sent: Saturday, July 21, 2012 6:07 AM
> To: Sean Paul
> Cc: grant.likely@...retlab.ca; linus.walleij@...ricsson.com; linux-kernel@...r.kernel.org;
> olofj@...omium.org; Sangsu Park; Thomas Abraham; Kukjin Kim
> Subject: Re: [PATCH] gpio: samsung: Fix off-by-one bug in gpio addresses
> 
> Acked-by: Doug Anderson <dianders@...omium.org>
> 
> ---
> 
> On Fri, Jul 20, 2012 at 1:58 PM, Sean Paul <seanpaul@...omium.org> wrote:
> >
> > Move gpc4 to the end of the automatically processed gpio controllers
> > so we don't taint the automatic offset calculation.
> >
> > This bug caused all controllers coming after gpc4 to map to the
> > incorrect address. The result is <&gpd1 0 0 0 0> would actually map to
> > GPIO 0 in gpd0.
> >
> > Signed-off-by: Sean Paul <seanpaul@...omium.org>
> > ---
> >  drivers/gpio/gpio-samsung.c |   14 +++++++-------
> >  1 files changed, 7 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-samsung.c b/drivers/gpio/gpio-samsung.c
> > index b6453d0..e4599b4 100644
> > --- a/drivers/gpio/gpio-samsung.c
> > +++ b/drivers/gpio/gpio-samsung.c
> > @@ -2454,12 +2454,6 @@ static struct samsung_gpio_chip exynos5_gpios_1[] = {
> >                 },
> >         }, {
> >                 .chip   = {
> > -                       .base   = EXYNOS5_GPC4(0),
> > -                       .ngpio  = EXYNOS5_GPIO_C4_NR,
> > -                       .label  = "GPC4",
> > -               },
> > -       }, {
> > -               .chip   = {
> >                         .base   = EXYNOS5_GPD0(0),
> >                         .ngpio  = EXYNOS5_GPIO_D0_NR,
> >                         .label  = "GPD0", @@ -2513,6 +2507,12 @@
> > static struct samsung_gpio_chip exynos5_gpios_1[] = {
> >                         .label  = "GPY6",
> >                 },
> >         }, {
> > +               .chip   = {
> > +                       .base   = EXYNOS5_GPC4(0),
> > +                       .ngpio  = EXYNOS5_GPIO_C4_NR,
> > +                       .label  = "GPC4",
> > +               },
> > +       }, {
> >                 .config = &samsung_gpio_cfgs[9],
> >                 .irq_base = IRQ_EINT(0),
> >                 .chip   = {
> > @@ -2833,7 +2833,7 @@ static __init void exynos5_gpiolib_init(void)
> >         }
> >
> >         /* need to set base address for gpc4 */
> > -       exynos5_gpios_1[11].base = gpio_base1 + 0x2E0;
> > +       exynos5_gpios_1[20].base = gpio_base1 + 0x2E0;
> >
> >         /* need to set base address for gpx */
> >         chip = &exynos5_gpios_1[21];
> > --
> > 1.7.7.3
> >

I think that this modification is right.
Thanks.

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