On Sat, 2013-10-05 at 16:20 +0200, Alexander Gordeev wrote:

So my point is - drivers should first obtain a number of MSIs they *can*
get, then *derive* a number of MSIs the device is fine with and only then
request that number. Not terribly different from memory or any other type
of resource allocation ;)

What if the limit is for a group of devices ? Your interface is racy in
that case, another driver could have eaten into the limit in between the
calls.

Ben.