Re: [igt-dev] [PATCH i-g-t] lib/pm: Fail gracefully if CONFIG_PM is not built into the kernel

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 05/09/2018 16:13, Chris Wilson wrote:
> Quoting Tvrtko Ursulin (2018-09-05 16:01:04)
>>
>> On 05/09/2018 10:07, Chris Wilson wrote:
>>> We report the failure from igt_setup_runtime_pm() so that the caller can
>>> decide how they may proceed, so replace the hard assert with the error
>>> propagation.
>>>
>>> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
>>> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>> Cc: Imre Deak <imre.deak@intel.com>
>>> ---
>>>    lib/igt_pm.c | 15 ++++++++++-----
>>>    1 file changed, 10 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/lib/igt_pm.c b/lib/igt_pm.c
>>> index 615463a08..49027238b 100644
>>> --- a/lib/igt_pm.c
>>> +++ b/lib/igt_pm.c
>>> @@ -511,12 +511,16 @@ bool igt_setup_runtime_pm(void)
>>>    
>>>        igt_pm_enable_audio_runtime_pm();
>>>    
>>> -     /* Our implementation uses autosuspend. Try to set it to 0ms so the test
>>> -      * suite goes faster and we have a higher probability of triggering race
>>> -      * conditions. */
>>> +     /*
>>> +      * Our implementation uses autosuspend. Try to set it to 0ms so the
>>> +      * test suite goes faster and we have a higher probability of
>>> +      * triggering race conditions.
>>> +      */
>>>        fd = open(POWER_DIR "/autosuspend_delay_ms", O_RDWR);
>>> -     igt_assert_f(fd >= 0,
>>> -                  "Can't open " POWER_DIR "/autosuspend_delay_ms\n");
>>> +     if (fd < 0) {
>>> +             igt_pm_audio_restore_runtime_pm();
>>> +             return false;
>>
>> Worth robustifying with an igt_assert_eq(errno, ENOENT) ?
> 
> You are just dying to debug all the transient ENOMEM and EMFILE aren't
> you! :)

Out of memory or file descriptors during test start really? We are in 
terrible state then..

Regards,

Tvrtko
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