# Re: \[PATCH 1/6\] msi: Kill msi\_lookup\_irq

- From: Eric W. Biederman \<hidden\>
- Date: 2007-01-28 22:20:11 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2007/01/915121
- Thread: https://ratatoskr.run/lkml/2007/01/915121/t.md

```text
Paul Mackerras [ref] writes:

> Eric W. Biederman writes:
>
>> @@ -693,15 +664,14 @@ int pci_enable_msi(struct pci_dev* dev)
>>  	if (!pos)
>>  		return -EINVAL;
>>  
>> -	WARN_ON(!msi_lookup_irq(dev, PCI_CAP_ID_MSI));
>> +	WARN_ON(!!dev->msi_enabled);
>
> Minor nit: what's wrong with just WARN_ON(dev->msi_enabled) ?

It's a bitfield so gcc complains when something in WARN_ON calls
typeof on it.  So it is easier to just say !! than to dig into
WARN_ON and see if it made any sense to fix WARN_ON, or to see if gcc
needed the bug fix.

> Also here:
>
>> @@ -836,16 +811,14 @@ int pci_enable_msix(struct pci_dev* dev, struct
> msix_entry *entries, int nvec)
>>  				return -EINVAL;	/* duplicate entry */
>>  		}
>>  	}
>> -	temp = dev->irq;
>> -	WARN_ON(!msi_lookup_irq(dev, PCI_CAP_ID_MSIX));
>> +	WARN_ON(!!dev->msix_enabled);
>
> Paul.
```