linux-kernel - Re: [PATCH 4/8] PCI PCIe portdrv: Do not enable port device before setting up interrupts

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Date:	Fri, 9 Jan 2009 15:25:52 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PCI <linux-pci@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/8] PCI PCIe portdrv: Do not enable port device before setting up interrupts

On Sunday, January 4, 2009 2:54 pm Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
>
> The PCI Express port driver calls pci_enable_device() before setting
> up interrupts, which is wrong, because if there is an interrupt pin
> configured for the port, pci_enable_device() will likely set up an
> interrupt link for it.  However, this shouldn't be done if either
> MSI or MSI-X interrupt mode is chosen for the port.
>
> The solution is to call pci_enable_device() after setting up
> interrupts, because in that case the interrupt link won't be set up
> if MSI or MSI-X are enabled.

Hm, wonder how this bug stuck around for so long...  Good catch.

-- 
Jesse Barnes, Intel Open Source Technology Center
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