Re: [PATCH v7 02/13] PCI/P2PDMA: Add sysfs group to display p2pmem stats

[Logan Gunthorpe]

On 2018-09-25 11:29 a.m., Bart Van Assche wrote:
> On Tue, 2018-09-25 at 10:22 -0600, Logan Gunthorpe wrote:
>> @@ -83,9 +132,14 @@ static int pci_p2pdma_setup(struct pci_dev *pdev)
>>  
>>  	pdev->p2pdma = p2p;
>>  
>> +	error = sysfs_create_group(&pdev->dev.kobj, &p2pmem_group);
>> +	if (error)
>> +		goto out_pool_destroy;
>> +
>>  	return 0;
>>  
>>  out_pool_destroy:
>> +	pdev->p2pdma = NULL;
>>  	gen_pool_destroy(p2p->pool);
>>  out:
>>  	devm_kfree(&pdev->dev, p2p);
> 
> This doesn't look right to me. Shouldn't devm_remove_action() be called instead
> of devm_kfree() if sysfs_create_group() fails?

That makes no sense to me. We are reversing a devm_kzalloc() not a
custom action....

One could argue we should _also_ remove the pci_p2pdma_release() action,
but seeing it has a NULL check on pdev->p2pdma it's pretty harmless to
leave in.

Logan