linux-kernel - Re: [PATCH 2/2] soc: bcm: bcm2835-pm: Fix error paths of initialization.

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Date:   Wed, 20 Feb 2019 10:18:54 -0800
From:   Eric Anholt <eric@...olt.net>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH 2/2] soc: bcm: bcm2835-pm: Fix error paths of initialization.

Florian Fainelli <f.fainelli@...il.com> writes:

> On 2/13/19 2:33 PM, Stefan Wahren wrote:
>> 
>>> Eric Anholt <eric@...olt.net> hat am 13. Februar 2019 um 19:28 geschrieben:
>>>
>>>
>>> Stefan Wahren <stefan.wahren@...e.com> writes:
>>>
>>>> Hi Eric,
>>>>
>>>> Am 13.02.19 um 01:33 schrieb Eric Anholt:
>>>>> The clock driver may probe after ours and so we need to pass the
>>>>> -EPROBE_DEFER out.  Fix the other error path while we're here.
>>>>>
>>>>> Signed-off-by: Eric Anholt <eric@...olt.net>
>>>>> Fixes: 670c672608a1 ("soc: bcm: bcm2835-pm: Add support for power domains under a new binding.")
>>>>> ---
>>>>>  drivers/soc/bcm/bcm2835-power.c | 30 +++++++++++++++++++++++++-----
>>>>>  1 file changed, 25 insertions(+), 5 deletions(-)
>>>>>
>>>>> diff --git a/drivers/soc/bcm/bcm2835-power.c b/drivers/soc/bcm/bcm2835-power.c
>>>>> index 4a1b99b773c0..11f9469423f7 100644
>>>>> --- a/drivers/soc/bcm/bcm2835-power.c
>>>>> +++ b/drivers/soc/bcm/bcm2835-power.c
>>>>> @@ -485,7 +485,7 @@ static int bcm2835_power_pd_power_off(struct generic_pm_domain *domain)
>>>>>  	}
>>>>>  }
>>>>>  
>>>>> -static void
>>>>> +static int
>>>>>  bcm2835_init_power_domain(struct bcm2835_power *power,
>>>>>  			  int pd_xlate_index, const char *name)
>>>>>  {
>>>>> @@ -493,6 +493,12 @@ bcm2835_init_power_domain(struct bcm2835_power *power,
>>>>>  	struct bcm2835_power_domain *dom = &power->domains[pd_xlate_index];
>>>>>  
>>>>>  	dom->clk = devm_clk_get(dev->parent, name);
>>>>> +	if (IS_ERR(dom->clk)) {
>>>>> +		int ret = PTR_ERR(dom->clk);
>>>>> +
>>>>> +		if (ret == -EPROBE_DEFER)
>>>>> +			return ret;
>>>> is it safe to proceed in the other error cases?
>>>> Even it would be more consistent with clk_prepare_enable() to print an
>>>> error here.
>>>
>>> Yes, not all domains have a clk, so we want to ignore the other error.
>> 
>> But shouldn't we set dom->clk to NULL instead of keeping the error
>> pointer? AFAIK clk_prepare_enable is aware of NULL instead of error
>> pointer.
>
> If the clock is really optional, then yes, this should be the way to go.

Sigh, error pointers.  Fixed, sending a v2.

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