linux-kernel - Re: [PATCH net-next 3/6] net: ipa: enable IPA interrupt handlers separate from registration

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Message-ID: <444adc6b-809f-be35-2114-f05b54db48bf@linaro.org>
Date:   Tue, 3 Jan 2023 14:25:24 -0600
From:   Alex Elder <elder@...aro.org>
To:     Caleb Connolly <caleb.connolly@...aro.org>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     mka@...omium.org, evgreen@...omium.org, andersson@...nel.org,
        quic_cpratapa@...cinc.com, quic_avuyyuru@...cinc.com,
        quic_jponduru@...cinc.com, quic_subashab@...cinc.com,
        elder@...nel.org, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 3/6] net: ipa: enable IPA interrupt handlers
 separate from registration

On 12/31/22 11:56 AM, Caleb Connolly wrote:
>>
>> diff --git a/drivers/net/ipa/ipa_interrupt.h 
>> b/drivers/net/ipa/ipa_interrupt.h
>> index f31fd9965fdc6..5f7d2e90ea337 100644
>> --- a/drivers/net/ipa/ipa_interrupt.h
>> +++ b/drivers/net/ipa/ipa_interrupt.h
>> @@ -85,6 +85,20 @@ void ipa_interrupt_suspend_clear_all(struct 
>> ipa_interrupt *interrupt);
>>    */
>>   void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt);
>> +/**
>> + * ipa_interrupt_enable() - Enable an IPA interrupt type
>> + * @ipa:    IPA pointer
>> + * @ipa_irq:    IPA interrupt ID
>> + */
>> +void ipa_interrupt_enable(struct ipa *ipa, enum ipa_irq_id ipa_irq);
> 
> I think you forgot a forward declaration for enum ipa_irq_id
> 
> Kind Regards,
> Caleb

OK I checked this.

You are correct that ipa_irq_id should be declared as an
enum at the top of "ipa_interrupt.h".  In addition to the
new function declarations, there were some existing
references to the enumerated type.  I believe this became
a (not-reported) problem starting with this commit:

   322053105f095 net: ipa: move definition of enum ipa_irq_id

It being missing did not result in any build warnings,
however.  Here's why.

The ipa_irq_id enumerated type is defined in "ipa_reg.h".

Note that "ipa_reg.h" is included by "ipa_endpoint.h".  So if
"ipa_endpoint.h" is included before "ipa_interrupt.h", the
ipa_irq_id type will have been defined before it's referenced
in "ipa_interrupt.h".

These files include "ipa_interrupt.h":

ipa.h:
It is included after "ipa_endpoint.h", so the enumerated type
is defined before it's needed in "ipa_interrupt.h".

ipa_main.c:
Here too, "ipa_endpoint.h" (as well as "ipa_reg.h") is included
before "ipa_interrupt.h", so the enumerated type is defined
before it's used there.

ipa_interrupt.c
In this case "ipa_reg.h" is included, then "ipa_endpoint.h",
before "ipa_interrupt.h".  So again, the enumerated type is
defined before it's referenced in "ipa_interrupt.h".

Nevertheless, your point is a good one and I'm going to
implement your suggestion when I post version 2.

Thank you!

					-Alex