[PATCH] drivers/firmware: psci: Convert timers to use timer_setup()

[PATCH] drivers/firmware: psci: Convert timers to use timer_setup()

[Kees Cook]

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. Also adds missing call to
destroy_timer_on_stack().

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: linux-arm-kernel at lists.infradead.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/firmware/psci_checker.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/psci_checker.c b/drivers/firmware/psci_checker.c
index 6523ce962865..f3f4f810e5df 100644
--- a/drivers/firmware/psci_checker.c
+++ b/drivers/firmware/psci_checker.c
@@ -220,7 +220,7 @@ static int hotplug_tests(void)
 	return err;
 }
 
-static void dummy_callback(unsigned long ignored) {}
+static void dummy_callback(struct timer_list *unused) {}
 
 static int suspend_cpu(int index, bool broadcast)
 {
@@ -287,7 +287,7 @@ static int suspend_test_thread(void *arg)
 	pr_info("CPU %d entering suspend cycles, states 1 through %d\n",
 		cpu, drv->state_count - 1);
 
-	setup_timer_on_stack(&wakeup_timer, dummy_callback, 0);
+	timer_setup_on_stack(&wakeup_timer, dummy_callback, 0);
 	for (i = 0; i < NUM_SUSPEND_CYCLE; ++i) {
 		int index;
 		/*
@@ -340,6 +340,7 @@ static int suspend_test_thread(void *arg)
 	 * later.
 	 */
 	del_timer(&wakeup_timer);
+	destroy_timer_on_stack(&wakeup_timer);
 
 	if (atomic_dec_return_relaxed(&nb_active_threads) == 0)
 		complete(&suspend_threads_done);
-- 
2.7.4


-- 
Kees Cook
Pixel Security

[PATCH] drivers/firmware: psci: Convert timers to use timer_setup()

[Lorenzo Pieralisi]

Hi Kees,

On Tue, Oct 24, 2017 at 03:13:31AM -0700, Kees Cook wrote:
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly.

> Also adds missing call to destroy_timer_on_stack().

This patch should be split I think. I can send a patch to add
the missing destroy_timer_on_stack() call (which may get in
as a fix) and then we add a patch to update the timer setup
API.

> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: linux-arm-kernel at lists.infradead.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
>  drivers/firmware/psci_checker.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/firmware/psci_checker.c b/drivers/firmware/psci_checker.c
> index 6523ce962865..f3f4f810e5df 100644
> --- a/drivers/firmware/psci_checker.c
> +++ b/drivers/firmware/psci_checker.c
> @@ -220,7 +220,7 @@ static int hotplug_tests(void)
>  	return err;
>  }
>  
> -static void dummy_callback(unsigned long ignored) {}
> +static void dummy_callback(struct timer_list *unused) {}
>  
>  static int suspend_cpu(int index, bool broadcast)
>  {
> @@ -287,7 +287,7 @@ static int suspend_test_thread(void *arg)
>  	pr_info("CPU %d entering suspend cycles, states 1 through %d\n",
>  		cpu, drv->state_count - 1);
>  
> -	setup_timer_on_stack(&wakeup_timer, dummy_callback, 0);
> +	timer_setup_on_stack(&wakeup_timer, dummy_callback, 0);

drivers/firmware/psci_checker.c: In function 'suspend_test_thread':
drivers/firmware/psci_checker.c:290:2: error: implicit declaration of
function 'timer_setup_on_stack' [-Werror=implicit-function-declaration]
  timer_setup_on_stack(&wakeup_timer, dummy_callback, 0);
    ^~~~~~~~~~~~~~~~~~~~

On which tree this change is based on ?

I will send out the fix separately and CC you in.

Thanks,
Lorenzo

>  	for (i = 0; i < NUM_SUSPEND_CYCLE; ++i) {
>  		int index;
>  		/*
> @@ -340,6 +340,7 @@ static int suspend_test_thread(void *arg)
>  	 * later.
>  	 */
>  	del_timer(&wakeup_timer);
> +	destroy_timer_on_stack(&wakeup_timer);
>  
>  	if (atomic_dec_return_relaxed(&nb_active_threads) == 0)
>  		complete(&suspend_threads_done);
> -- 
> 2.7.4
> 
> 
> -- 
> Kees Cook
> Pixel Security

[PATCH] drivers/firmware: psci: Convert timers to use timer_setup()

[Kees Cook]

On Tue, Oct 24, 2017 at 6:52 AM, Lorenzo Pieralisi
<lorenzo.pieralisi@arm.com> wrote:
> Hi Kees,
>
> On Tue, Oct 24, 2017 at 03:13:31AM -0700, Kees Cook wrote:
>> In preparation for unconditionally passing the struct timer_list pointer to
>> all timer callbacks, switch to using the new timer_setup() and from_timer()
>> to pass the timer pointer explicitly.
>
>> Also adds missing call to destroy_timer_on_stack().
>
> This patch should be split I think. I can send a patch to add
> the missing destroy_timer_on_stack() call (which may get in
> as a fix) and then we add a patch to update the timer setup
> API.

Okay, sure, should be fine to split this.

>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
>> Cc: linux-arm-kernel at lists.infradead.org
>> Signed-off-by: Kees Cook <keescook@chromium.org>
>> ---
>>  drivers/firmware/psci_checker.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/firmware/psci_checker.c b/drivers/firmware/psci_checker.c
>> index 6523ce962865..f3f4f810e5df 100644
>> --- a/drivers/firmware/psci_checker.c
>> +++ b/drivers/firmware/psci_checker.c
>> @@ -220,7 +220,7 @@ static int hotplug_tests(void)
>>       return err;
>>  }
>>
>> -static void dummy_callback(unsigned long ignored) {}
>> +static void dummy_callback(struct timer_list *unused) {}
>>
>>  static int suspend_cpu(int index, bool broadcast)
>>  {
>> @@ -287,7 +287,7 @@ static int suspend_test_thread(void *arg)
>>       pr_info("CPU %d entering suspend cycles, states 1 through %d\n",
>>               cpu, drv->state_count - 1);
>>
>> -     setup_timer_on_stack(&wakeup_timer, dummy_callback, 0);
>> +     timer_setup_on_stack(&wakeup_timer, dummy_callback, 0);
>
> drivers/firmware/psci_checker.c: In function 'suspend_test_thread':
> drivers/firmware/psci_checker.c:290:2: error: implicit declaration of
> function 'timer_setup_on_stack' [-Werror=implicit-function-declaration]
>   timer_setup_on_stack(&wakeup_timer, dummy_callback, 0);
>     ^~~~~~~~~~~~~~~~~~~~
>
> On which tree this change is based on ?

Oh whoops, sorry, timer_setup() was in -rc3, but I see now that
timer_setup_on_stack() is only in -next. If you're okay with this
change, I can carry it in the timer tree for -next instead.

> I will send out the fix separately and CC you in.

Thanks!

-Kees

-- 
Kees Cook
Pixel Security