[PATCH 01/15] genirq/devres: Add error information printing for devm_request_threaded_irq()

[Krzysztof Kozlowski]

On 03/07/2023 11:10, Yangtao Li wrote:
> On 2023/6/27 15:43, Krzysztof Kozlowski wrote:
> 
>> On 27/06/2023 09:16, Yangtao Li wrote:
>>> Ensure that all error handling branches print error information. In this
>>> way, when this function fails, the upper-layer functions can directly
>>> return an error code without missing debugging information. Otherwise,
>>> the error message will be printed redundantly or missing.
>>>
>>> There are more than 700 calls to the devm_request_threaded_irq method.
>>> If error messages are printed everywhere, more than 1000 lines of code
>>> can be saved by removing the msg in the driver.
>>>
>>> Signed-off-by: Yangtao Li <frank.li at vivo.com>
>>> ---
>>>   kernel/irq/devres.c | 5 ++++-
>>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
>>> index f6e5515ee077..94039a915218 100644
>>> --- a/kernel/irq/devres.c
>>> +++ b/kernel/irq/devres.c
>>> @@ -58,8 +58,10 @@ int devm_request_threaded_irq(struct device *dev, unsigned int irq,
>>>   
>>>   	dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
>>>   			  GFP_KERNEL);
>>> -	if (!dr)
>>> +	if (!dr) {
>>> +		dev_err(dev, "Failed to allocate device resource data\n");
>> Just like any memory allocation, I don't think we print anything for
>> devres failures. Why do you think we should start doing it?
> 
> 
> And tglx point out that:
> 
> Having proper and consistent information why the device cannot be used 
> _is_ useful.

Where did tglx suggest printing devres allocation ENOMEM errors?

Best regards,
Krzysztof