linux-kernel - Re: [PATCH] net: ipa: Remove redundant dev

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Date:   Mon, 12 Dec 2022 07:11:27 -0600
From:   Alex Elder <elder@...e.org>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Kang Minchul <tegongkang@...il.com>,
        Alex Elder <elder@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ipa: Remove redundant dev_err()

On 12/11/22 10:34 AM, Heiner Kallweit wrote:
> On 11.12.2022 15:47, Kang Minchul wrote:
>> Function dev_err() is redundant because platform_get_irq_byname()
>> already prints an error.
>>
>> Signed-off-by: Kang Minchul <tegongkang@...il.com>
>> ---
>>   drivers/net/ipa/gsi.c | 5 +----
>>   1 file changed, 1 insertion(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
>> index 55226b264e3c..585cfd3f9ec0 100644
>> --- a/drivers/net/ipa/gsi.c
>> +++ b/drivers/net/ipa/gsi.c
>> @@ -1967,11 +1967,8 @@ int gsi_init(struct gsi *gsi, struct platform_device *pdev, bool prefetch,
>>   
>>   	/* Get the GSI IRQ and request for it to wake the system */
>>   	ret = platform_get_irq_byname(pdev, "gsi");
>> -	if (ret <= 0) {
>> -		dev_err(gsi->dev,
>> -			"DT error %d getting \"gsi\" IRQ property\n", ret);
>> +	if (ret <= 0)
> 
> According to the function description it can't return 0.

That's great!  I explicitly checked for 0 because at the
time I couldn't *prove* that 0 was an invalid return, and
there was nothing obvious in the function saying so.  I
*thought* it was invalid but lacked the guidance in the
code to know for sure.

Here is the commit that fixed that:
   a85a6c86c25be driver core: platform: Clarify that IRQ 0 is invalid

And it turns out that this particular block of code got
moved but not modified after that comment commit:
   0b8d676108451 net: ipa: request GSI IRQ later

Anyway, I'm very pleased this can be simplified.

					-Alex

> You can further simplify the code.
> And you patch should be annotated net-next.
> 
>>   		return ret ? : -EINVAL;
>> -	}
>>   	irq = ret;
>>   
>>   	ret = request_irq(irq, gsi_isr, 0, "gsi", gsi);
>