linux-kernel - Re: PCI device driver broken between 4.2 and 4.3

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Message-ID: <CAE9FiQXq5-h56P-94+_LVXRhVipJsfVFYx1HcwqewEfZp1PGkw@mail.gmail.com>
Date:	Fri, 29 Jan 2016 22:15:34 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <helgaas@...nel.org>
Cc:	Мороз Олег <oleg.moroz@....vniiem.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: PCI device driver broken between 4.2 and 4.3

On Fri, Jan 29, 2016 at 8:31 AM, Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> 991de2e59090 is related to IRQs, so I'd start by printing dev->irq in your
> driver before and after you call pci_enable_device().  Add some printks in
> pcibios_alloc_irq() and pcibios_enable_device() just to confirm that we got
> there and when, e.g., add lines like this:

looks like that commit removed pcibios_enable_irq for parent bridge.

pci_enable_device==>pci_enable_bridge==>pci_enable_device==>pcibios_enable_device
==>pcibios_enable_irq without msi enabled.

so pci=routeirq may workaround the problem.

Thanks

Yinghai