[LEDE-DEV] [PATCH v2 09/14] rt2x00: rt2x00pci: set PCI MWI only if supported

[John Crispin]

On 16/01/2017 12:42, Daniel Golle wrote:
> Hi!
> 
> On Mon, Jan 16, 2017 at 11:08:57AM +0100, Stanislaw Gruszka wrote:
>> On Mon, Jan 16, 2017 at 04:06:25AM +0100, Daniel Golle wrote:
>>> From: Claudio Mignanti <c.mignanti at gmail.com>
>>>
>>> This is needed for devices without support for PCI MWI. See also
>>> https://dev.openwrt.org/changeset/21850
>>>
>>> Signed-off-by: Daniel Golle <daniel at makrotopia.org>
>>> ---
>>>  drivers/net/wireless/ralink/rt2x00/rt2x00pci.c | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00pci.c b/drivers/net/wireless/ralink/rt2x00/rt2x00pci.c
>>> index eb6dbcd4fddf..4becfeb75ba8 100644
>>> --- a/drivers/net/wireless/ralink/rt2x00/rt2x00pci.c
>>> +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00pci.c
>>> @@ -94,8 +94,10 @@ int rt2x00pci_probe(struct pci_dev *pci_dev, const struct rt2x00_ops *ops)
>>>  
>>>  	pci_set_master(pci_dev);
>>>  
>>> +#ifdef CONFIG_PCI_SET_MWI
>>>  	if (pci_set_mwi(pci_dev))
>>>  		rt2x00_probe_err("MWI not available\n");
>>> +#endif
>>
>> There is no CONFIG_PCI_SET_MWI in the kernel. This patch is either not
>> needed (pci subsystem has own PCI_DISABLE_MWI define) or wrong (we
>> should not call this function for some devices).
> 
> Is anyone with good long-term memory able to tell why this was needed
> in first place? Can we assume it to be obsolete when using modern
> kernels?
> 
> 
> Cheers
> 
> 
> Daniel
> 

this was related to rt61 a few years ago. i'll dive into my mail archive
later today to see if i can figure out why,

	John