[PATCH] bus/pci: fix automatic interrupt type selection

[Thomas Monjalon]

27/06/2025 21:33, Pekka Riikonen:
> On 2025-06-27 19:00, Thomas Monjalon wrote:
> > 20/06/2025 13:47, priikone at iki.fi:
> >> Check if kernel returns 0 interrupt vectors and try another interrupt
> >> type in that case.  Failing to check the vector count can select an
> >> interrupt type that's unusable.
> >> 
> >> Signed-off-by: Pekka Riikonen <priikone at iki.fi>
> > 
> > Please could you be explicit about the use case you are trying to fix?
> 
> This particular case was with e1000em that only supported INTx, but the 
> function selected MSI-X simply because it's the first one attempted, 
> even though it got 0 vectors.  Enabling interrupts then failed.  If the 
> function had checked the vector count it would have correctly selected 
> INTx.  Now, my setup might have been quite old but it doesn't change 
> that it selected wrong interrupt type.

OK thank you, it helps for the review, and could be added to the commit log.

Adding PCI bus maintainers for review.