linux-kernel - Re: [PATCH 2/2] sb_edac: Claim a different PCI device

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Date:	Tue, 09 Sep 2014 06:25:16 -0300
From:	Mauro Carvalho Chehab <m.chehab@...sung.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Aristeu Rozanski <aris@...hat.com>,
	Doug Thompson <dougthompson@...ssion.com>,
	Borislav Petkov <bp@...en8.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-edac@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Rui Wang <ruiv.wang@...il.com>
Subject: Re: [PATCH 2/2] sb_edac: Claim a different PCI device

Em Mon, 08 Sep 2014 16:41:31 -0700
Greg Kroah-Hartman <gregkh@...uxfoundation.org> escreveu:

> On Mon, Sep 08, 2014 at 02:49:59PM -0700, Andy Lutomirski wrote:
> > On Mon, Sep 8, 2014 at 7:10 AM, Aristeu Rozanski <aris@...hat.com> wrote:
> > > On Thu, Aug 14, 2014 at 02:45:41PM -0700, Andy Lutomirski wrote:
> > >> sb_edac controls a large number of different PCI functions.  Rather
> > >> than registering as a normal PCI driver for all of them, it
> > >> registers for just one so that it gets probed and, at probe time, it
> > >> looks for all the others.
> > >>
> > >> Coincidentally, the device it registers for also contains the SMBUS
> > >> registers, so the PCI core will refuse to probe both sb_edac and a
> > >> future iMC SMBUS driver.  The drivers don't actually conflict, so
> > >> just change sb_edac's device table to probe a different device.
> > >>
> > >> An alternative fix would be to merge the two drivers, but sb_edac
> > >> will also refuse to load on non-ECC systems, whereas i2c_imc would
> > >> still be useful without ECC.
> > >>
> > >> The only user-visible change should be that sb_edac appears to bind
> > >> a different device.
> > >>
> > >> Cc: Mauro Carvalho Chehab <m.chehab@...sung.com>
> > >> Cc: Rui Wang <ruiv.wang@...il.com>
> > >> Signed-off-by: Andy Lutomirski <luto@...capital.net>
> > >> ---
> > >>  drivers/edac/sb_edac.c | 2 +-
> > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > >>
> > >> diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
> > >> index a2597e9313c6..e3bc2cced580 100644
> > >> --- a/drivers/edac/sb_edac.c
> > >> +++ b/drivers/edac/sb_edac.c
> > >> @@ -432,7 +432,7 @@ static const struct pci_id_table pci_dev_descr_ibridge_table[] = {
> > >>   *   pci_device_id   table for which devices we are looking for
> > >>   */
> > >>  static const struct pci_device_id sbridge_pci_tbl[] = {
> > >> -     {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA)},
> > >> +     {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0)},
> > >>       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IBRIDGE_IMC_HA0_TA)},
> > >>       {0,}                    /* 0 terminated list. */
> > >>  };
> > >
> > > Acked-by: Aristeu Rozanski <aris@...hat.com>
> > >
> > 
> > Whose tree will this go through?
> 
> Mauro should have a tree for this as he's the subsystem maintainer.

Yes, I'll handle it.

> > FWIW, this git am can't apply this to 3.17-rc4, but git am --3way can,
> > and it's a one-liner in any case.  Should I send a trivially rebased
> > version?

No need. I'll fix any merge conflicts that might arise.

Regards.
Mauro
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