linux-kernel - Re: [PATCH] pci: let pci_device_shutdown to call pci_disable

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Date:	Wed, 23 Apr 2008 05:57:30 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	yhlu.kernel@...il.com
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"Greg KH" <greg@...ah.com>, "David Miller" <davem@...emloft.net>,
	"Jeff Garzik" <jeff@...zik.org>,
	"linux-pci" <linux-pci@...ey.karlin.mff.cuni.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Sathya Prakash <sathya.prakash@....com>
Subject: Re: [PATCH] pci: let pci_device_shutdown to call pci_disable_msi

Yinghai Lu <yhlu.kernel.send@...il.com> writes:

> this change
>
> | commit 23a274c8a5adafc74a66f16988776fc7dd6f6e51
> | Author: Prakash, Sathya <sathya.prakash@....com>
> | Date:   Fri Mar 7 15:53:21 2008 +0530
> |
> |     [SCSI] mpt fusion: Enable MSI by default for SAS controllers
> |
> | This patch modifies the driver to enable MSI by default for all SAS chips.
> |
> |     Signed-off-by: Sathya Prakash <sathya.prakash@....com>
> |     Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
> |
> cause kexec RHEL 5.1 kernel fail.
>
> root casue: the rhel 5.1 kernel still use INTx emulation.
> and mptscsih_shutdown doesn't call pci_disable_msi to reenable INTx on kexec
> path
>
> so try to call pci_disable_msi in shutdown patch

Ok this looks like a reasonable approach.

Could you please change how this is factored.
And implement a pci_shutdown_msi and a pci_shutdown_msix that
just performs the hardware state change.

Then have pci_disable_msi and pci_disable_msix call them?

That should be much easier to maintain then a adding a function
that takes a magic flag. 

That is the design of the shutdown interface and it seems to
work well.

Eric
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