From: Bjorn Helgaas <helgaas@kernel.org>
To: Rob Groner <rgroner@rtd.com>
Cc: linux-pci@vger.kernel.org, jiang.liu@linux.intel.com,
bhelgaas@google.com, tglx@linutronix.de
Subject: Re: PCI IRQ issue since 4.2 kernel
Date: Thu, 31 Mar 2016 08:40:00 -0500 [thread overview]
Message-ID: <20160331134000.GA31995@localhost> (raw)
In-Reply-To: <1459430795.1998.11.camel@rtd-VirtualBox>
Hi Rob,
On Thu, Mar 31, 2016 at 09:26:35AM -0400, Rob Groner wrote:
> We became aware of an issue with our Linux drivers when used with a 4.4
> kernel. These drivers had worked previously from 2.6.35 to 4.2 kernels.
> The symptoms were that, even though the request_irq() call was
> successful, we did not receive any IRQs. IRQs did arrive on a different
> IRQ line, however, and the kernel disabled that line because there was
> no handler.
Others have seen similar issues, so we reverted 991de2e59090 ("PCI, x86:
Implement pcibios_alloc_irq() and pcibios_free_irq()").
The revert, 6c777e8799a9 ("Revert "PCI, x86: Implement pcibios_alloc_irq()
and pcibios_free_irq()""), appeared in v4.5-rc6, so if you try that or a
later kernel (including v4.5), it should work.
Let us know if you still see problems.
Bjorn
> -----------------------------------------------------------------------
> rtd@kernel-dev:~/git/kernels/linux$ git bisect good
> 991de2e59090e55c65a7f59a049142e3c480f7bd is the first bad commit
> commit 991de2e59090e55c65a7f59a049142e3c480f7bd
> Author: Jiang Liu <jiang.liu@linux.intel.com>
> Date: Wed Jun 10 16:54:59 2015 +0800
>
> PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()
>
> To support IOAPIC hotplug, we need to allocate PCI IRQ resources on
> demand
> and free them when not used anymore.
>
> Implement pcibios_alloc_irq() and pcibios_free_irq() to dynamically
> allocate and free PCI IRQs.
>
> Remove mp_should_keep_irq(), which is no longer used.
>
> [bhelgaas: changelog]
> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Acked-by: Thomas Gleixner <tglx@linutronix.de>
>
> :040000 040000 765e2d5232d53247ec260b34b51589c3bccb36ae
> f680234a27685e94b1a35ae2a7218f8eafa9071a M arch
> :040000 040000 d55a682bcde72682e883365e88ad1df6186fd54d
> f82c470a04a6845fcf5e0aa934512c75628f798d M drivers
> ----------------------------------------------------------------
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2016-03-31 13:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-31 13:26 PCI IRQ issue since 4.2 kernel Rob Groner
2016-03-31 13:40 ` Bjorn Helgaas [this message]
2016-03-31 13:44 ` Rob Groner
2016-03-31 15:05 ` Rob Groner
2016-03-31 15:14 ` Bjorn Helgaas
2016-03-31 15:17 ` Rob Groner
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