On Wed, 2008-05-07 at 16:31 -0700, Andrew Morton wrote:
> On Tue, 22 Apr 2008 20:12:08 -0700
> "Yinghai Lu" <yhlu.kernel@xxxxxxxxx> wrote:
>
> > On Tue, Apr 22, 2008 at 7:47 PM, Yinghai Lu <yhlu.kernel.send@xxxxxxxxx> wrote:
> > >
> > >
> > > this change
> > >
> > > | commit 23a274c8a5adafc74a66f16988776fc7dd6f6e51
> > > | Author: Prakash, Sathya <sathya.prakash@xxxxxxx>
> > > | 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.
> > > |
> > > 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 mptsas_remove in mptsas_shutdown.
> > > then pci_disable_msi will be called via mptsas_remove==>mptscih_remove==>
> > > mpt_detach.
> > >
> > > Signed-off-by: Yinghai Lu <yhlu.kernel@xxxxxxxxx>
> > > CC: Prakash, Sathya <sathya.prakash@xxxxxxx>
> > > CC: "Moore, Eric" <Eric.Moore@xxxxxxx>
> > >
> > > Index: linux-2.6/drivers/message/fusion/mptsas.c
> > > ===================================================================
> > > --- linux-2.6.orig/drivers/message/fusion/mptsas.c
> > > +++ linux-2.6/drivers/message/fusion/mptsas.c
> > > @@ -3327,6 +3327,11 @@ static void __devexit mptsas_remove(stru
> > > mptscsih_remove(pdev);
> > > }
> > >
> > > +static void mptsas_shutdown(struct pci_dev *pdev)
> > > +{
> > > + mptsas_remove(pdev);
> > > +}
> > > +
> > > static struct pci_device_id mptsas_pci_table[] = {
> > > { PCI_VENDOR_ID_LSI_LOGIC, MPI_MANUFACTPAGE_DEVID_SAS1064,
> > > PCI_ANY_ID, PCI_ANY_ID },
> > > @@ -3348,7 +3353,7 @@ static struct pci_driver mptsas_driver =
> > > .id_table = mptsas_pci_table,
> > > .probe = mptsas_probe,
> > > .remove = __devexit_p(mptsas_remove),
> > > - .shutdown = mptscsih_shutdown,
> > > + .shutdown = mptsas_shutdown,
> > > #ifdef CONFIG_PM
> > > .suspend = mptscsih_suspend,
> > > .resume = mptscsih_resume,
> > > --
> >
> > fail on one system with big sas expander...
> >
> > LBSuse:~ # mkdir /xx
> > LBSuse:~ # mount /dev/sdl1 /xx
> > LBSuse:~ # cd /xx
> > LBSuse:/xx # sh kk_rh_5.1
> > LBSuse:/xx # ./kexec -e
> > BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
> > IP: [<ffffffff80337af4>] sysfs_find_dirent+0x1f/0x5f
> > PGD 41f137067 PUD 424482067 PMD 0
> > Oops: 0000 [1] SMP
> > CPU 7
> > Modules linked in:
> > Pid: 7534, comm: kexec Not tainted
>
> I don't understand your email.
>
> Are you saying that this oops is the thing which your patch fixes?
>
> Or are you saying that this oops occurs even after your patch is applied?
> That we have a second regression?
The regression is actually PCI generic, not mpt specific. It was fixed
by this commit:
commit d52877c7b1afb8c37ebe17e2005040b79cb618b0
Author: Yinghai Lu <yhlu.kernel.send@xxxxxxxxx>
Date: Wed Apr 23 14:58:09 2008 -0700
pci/irq: let pci_device_shutdown to call pci_msi_shutdown v2
James
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