Re: [PATCH RFC 54/77] ntb: Ensure number of MSIs on SNB is enoughfor the link interrupt

[Alexander Gordeev]

On Wed, Oct 02, 2013 at 05:48:05PM -0700, Jon Mason wrote:
> On Wed, Oct 02, 2013 at 12:49:10PM +0200, Alexander Gordeev wrote:
> > Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
> > ---
> >  drivers/ntb/ntb_hw.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
> > index de2062c..eccd5e5 100644
> > --- a/drivers/ntb/ntb_hw.c
> > +++ b/drivers/ntb/ntb_hw.c
> > @@ -1066,7 +1066,7 @@ static int ntb_setup_msix(struct ntb_device *ndev)
> >  		/* On SNB, the link interrupt is always tied to 4th vector.  If
> >  		 * we can't get all 4, then we can't use MSI-X.
> >  		 */
> > -		if (ndev->hw_type != BWD_HW) {
> > +		if ((rc < SNB_MSIX_CNT) && (ndev->hw_type != BWD_HW)) {
> 
> Nack, this check is unnecessary.

If SNB can do more than SNB_MSIX_CNT MSI-Xs then this check is needed
to enable less than maximum MSI-Xs in case the maximum was not allocated.
Otherwise SNB will fallback to single MSI instead of multiple MSI-Xs.

-- 
Regards,
Alexander Gordeev
agordeev@xxxxxxxxxx
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