[PATCH] ALSA: hda-intel - Disable MSI support by default]

[Brice Goglin <Brice.Goglin@ens-lyon.org>]

(forgot to cc: LKML)

Roland Dreier wrote:
>  > A whitelist is an awkward solution, the problem is the number of
>  > chipsets available with MSI will continue to grow. And the assumption
>  > is that after Microsoft OS supports MSI, that newer chipsets will work.
>
> Maybe a whitelist for older systems and then enable everything after a
> DMI cutoff date by default?  Doesn't work on non-PC stuff though...  


When I started sending patches about all this, I proposed a whitelist
for PCI bridges and a blacklist for PCIe bridges, but Greg was against
whitelisting.

Now, reading this thread, I am very disturbed with the idea of disabling
MSI on all non-Intel bridges. Blacklisting correctly shouldn't be that
hard. From my point of view, there are several non-Intel bridges that
seem to support MSI very well (especially some HT<->PCIe bridges). And
apart from being required for ipath, MSI improves the performance of
network drivers a bit, so I'd rather keep it enabled on trusted bridges...

Brice