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

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Message-ID: <CAJuYYwQ+SRAPvkdbPu_UzZmxPon9d+La2rNy0FVy79t_CBGApQ@mail.gmail.com>
Date:	Mon, 30 Jul 2012 14:07:17 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	박상수 <sangsu4u.park@...sung.com>
Cc:	Doug Anderson <dianders@...omium.org>,
	Sean Paul <seanpaul@...omium.org>, grant.likely@...retlab.ca,
	linus.walleij@...ricsson.com, linux-kernel@...r.kernel.org,
	olofj@...omium.org, Kukjin Kim <kgene.kim@...sung.com>
Subject: Re: [PATCH] gpio: samsung: Fix off-by-one bug in gpio addresses

On 30 July 2012 13:34, 박상수 <sangsu4u.park@...sung.com> wrote:
>
>
>> -----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.

Reviewed-by: Thomas Abraham <thomas.abraham@...aro.org>
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