On Thu, 7 May 2009 07:49:53 pm Sheng Yang wrote: > On Thursday 07 May 2009 17:53:02 Matthew Wilcox wrote: > > Here's a good example. Let's suppose you have a driver which supports > > two different models of cards, one has 16 MSI-X interrupts, the other > > has 10. You can call pci_enable_msix() asking for 16 vectors. If your > > card is model A, you get 16 interrupts. If your card is model B, it says > > "you can have 10".
Sheng is absolutely right, that's a horrid API. If it actually enabled that number and returned it, it might make sense (cf. write() returning less bytes than you give it). But overloading the return value to save an explicit call is just ugly; it's not worth saving a few lines of code at cost of making all the drivers subtle and tricksy. Fail with -ENOSPC or something. Rusty. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
