linux-kernel - Re: [PATCH 1/1] genirq/timings: Fix error return code in irq_timings_test

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Date:   Wed, 11 Aug 2021 15:11:51 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] genirq/timings: Fix error return code in
 irq_timings_test_irqs()



On 2021/8/10 21:33, Thomas Gleixner wrote:
> On Sat, May 08 2021 at 14:20, Zhen Lei wrote:
>> Fix to return a negative error code from the error handling case instead
>> of 0, as done elsewhere in this function.
> 
> Returning an error code is fine, but
> 
>>  
>>  		__irq_timings_store(irq, irqs, ti->intervals[i]);
>>  		if (irqs->circ_timings[i & IRQ_TIMINGS_MASK] != index) {
>> +			ret = -EFAULT;
> 
> EFAULT is really not appropriate here. EFAULT is used for mapping
> faults. ENOSPC or EBADSLT perhaps?

EBADSLT will be better, the cyclic buffer can not be "no space".

> 
>>  			pr_err("Failed to store in the circular buffer\n");
>>  			goto out;
>>  		}
>>  	}
>>  
>>  	if (irqs->count != ti->count) {
>> +		ret = -EFAULT;
> 
> ERANGE?

Looks better than EFAULT.

Thank you for your suggestion, I will send v2.

> 
> Thanks,
> 
>         tglx
> .
>