[Bug 229267] [patch] mps(4) irq allocation regression from r321714: INTx used instead of MSI if MSI-X unavail

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229267

            Bug ID: 229267
           Summary: [patch] mps(4) irq allocation regression from r321714:
                    INTx used instead of MSI if MSI-X unavail
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: bugzilla.freebsd at omnilan.de

Created attachment 194551
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=194551&action=edit
Fix MSI allocation check for mps(4) and mpr(4) after r321714

Hello,

already reported on freebsd-scsi@ (¹), I'd like to make sure this doesn't get
lost.

In r321714(²), which is part of MFC r322658(³), there's an unintended change
that causes MSI allocation to be skipped in case MSI-X is not available.

Please find attached a patch which I'm using for mps(4) on 11.2 and the same
for mpr(4), which I haven't tested!

(¹) https://lists.freebsd.org/pipermail/freebsd-scsi/2018-June/007743.html
(²) https://svnweb.freebsd.org/base?view=revision&revision=321714
(³) https://svnweb.freebsd.org/base?view=revision&revision=322658

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