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The MSIX interrupt was always acked without checking its value, which caused a race condition. If the ISR was raised between the read and the acking, the ISR was never detected and it timed out. Signed-off-by: Marc Marí <marc.mari.barcelo@gmail.com> Reviewed-by: John Snow <jsnow@redhat.com> Tested-by: John Snow <jsnow@redhat.com> Message-id: 1424795655-16952-1-git-send-email-marc.mari.barcelo@gmail.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>