Re: [PATCH] pci: let pci_device_shutdown to call pci_disable_msi

["Yinghai Lu" <yhlu.kernel@gmail.com>]

On Wed, Apr 23, 2008 at 5:57 AM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
> Yinghai Lu <yhlu.kernel.send@gmail.com> writes:
>
>  > this change
>  >
>  > | commit 23a274c8a5adafc74a66f16988776fc7dd6f6e51
>  > | Author: Prakash, Sathya <sathya.prakash@lsi.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@lsi.com>
>  > |     Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.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.

will check that.

YH