linux-kernel - Re: [PATCH 24/31] mips/sgi-ip22: Use separate static data field with with static timer

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Message-ID: <CAGXu5jJmZ3NMGcG5jz739ukgdWJ3+0krL=A-_C7ntWmwNcXn=A@mail.gmail.com>
Date:   Fri, 1 Sep 2017 09:57:32 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ralf Baechle <ralf@...ux-mips.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        James Hogan <james.hogan@...tec.com>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 24/31] mips/sgi-ip22: Use separate static data field with
 with static timer

On Thu, Aug 31, 2017 at 11:59 PM, Ralf Baechle <ralf@...ux-mips.org> wrote:
> On Thu, Aug 31, 2017 at 04:29:36PM -0700, Kees Cook wrote:
>
>> In preparation for changing the timer callback argument to the timer
>> pointer, move to a separate static data variable.
>>
>> Cc: Ralf Baechle <ralf@...ux-mips.org>
>> Cc: James Hogan <james.hogan@...tec.com>
>> Cc: Ingo Molnar <mingo@...nel.org>
>> Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
>> Cc: linux-mips@...ux-mips.org
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>>  arch/mips/sgi-ip22/ip22-reset.c | 16 ++++++++--------
>>  1 file changed, 8 insertions(+), 8 deletions(-)
>>
>> diff --git a/arch/mips/sgi-ip22/ip22-reset.c b/arch/mips/sgi-ip22/ip22-reset.c
>> index 196b041866ac..5cc32610e6d3 100644
>> --- a/arch/mips/sgi-ip22/ip22-reset.c
>> +++ b/arch/mips/sgi-ip22/ip22-reset.c
>> @@ -38,6 +38,7 @@
>>  #define PANIC_FREQ           (HZ / 8)
>>
>>  static struct timer_list power_timer, blink_timer, debounce_timer;
>> +static unsigned long blink_timer_timeout;
>
> You're removing power_timer and debounce_timer ...

Nope, I think you misread: this only adds blink_timer_timeout;

>
>>  #define MACHINE_PANICED              1
>>  #define MACHINE_SHUTTING_DOWN        2
>> @@ -86,13 +87,13 @@ static void power_timeout(unsigned long data)
>>       sgi_machine_power_off();
>>  }
>>
>> -static void blink_timeout(unsigned long data)
>> +static void blink_timeout(unsigned long unused)
>>  {
>>       /* XXX fix this for fullhouse  */
>>       sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
>>       sgioc->reset = sgi_ioc_reset;
>>
>> -     mod_timer(&blink_timer, jiffies + data);
>> +     mod_timer(&blink_timer, jiffies + blink_timer_timeout);
>>  }
>>
>>  static void debounce(unsigned long data)
>> @@ -128,8 +129,8 @@ static inline void power_button(void)
>>       }
>>
>>       machine_state |= MACHINE_SHUTTING_DOWN;
>> -     blink_timer.data = POWERDOWN_FREQ;
>> -     blink_timeout(POWERDOWN_FREQ);
>> +     blink_timer_timeout = POWERDOWN_FREQ;
>> +     blink_timeout(0);
>>
>>       setup_timer(&power_timer, power_timeout, 0UL);
>
> ... but don't remove the reference to power_timer nor use of debounce_timer.
>
>>       power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
>> @@ -169,8 +170,8 @@ static int panic_event(struct notifier_block *this, unsigned long event,
>>               return NOTIFY_DONE;
>>       machine_state |= MACHINE_PANICED;
>>
>> -     blink_timer.data = PANIC_FREQ;
>> -     blink_timeout(PANIC_FREQ);
>> +     blink_timer_timeout = PANIC_FREQ;
>> +     blink_timeout(0);
>>
>>       return NOTIFY_DONE;
>>  }
>> @@ -193,8 +194,7 @@ static int __init reboot_setup(void)
>>               return res;
>>       }
>>
>> -     init_timer(&blink_timer);
>> -     blink_timer.function = blink_timeout;
>> +     setup_timer(&blink_timer, blink_timeout, 0);
>>       atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
>>
>>       return 0;
>
>   Ralf

-Kees


-- 
Kees Cook
Pixel Security