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

[Daniel Golle]

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