On Wed, Jun 16, 2010 at 03:09:11PM +0900, Hidetoshi Seto wrote:
> (2010/06/16 13:51), Rusty Russell wrote:
> > drivers/pci/pci.c:2277: error: redefinition of ‘pci_msi_off’
> > include/linux/pci.h:786: note: previous definition of ‘pci_msi_off’ was here
> >
> > Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
> > ---
> > drivers/pci/pci.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -2266,6 +2266,7 @@ pci_intx(struct pci_dev *pdev, int enabl
> > }
> > }
> >
> > +#ifdef CONFIG_PCI_MSI
> > /**
> > * pci_msi_off - disables any msi or msix capabilities
> > * @dev: the PCI device to operate on
> > @@ -2293,6 +2294,7 @@ void pci_msi_off(struct pci_dev *dev)
> > }
> > }
> > EXPORT_SYMBOL_GPL(pci_msi_off);
> > +#endif
> >
> > #ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE
> > int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size)
>
> Rusty, thank you for reporting it.
> But I think this fix is not correct.
>
> It looks like a bug in Michael's patch:
> [PATCH for-2.6.35] virtio-pci: disable msi at startup
>
> The patch includes a change as following:
>
> > > --- a/include/linux/pci.h
> > > +++ b/include/linux/pci.h
> > > @@ -780,7 +780,11 @@ int __must_check pci_set_mwi(struct pci_dev *dev);
> > > int pci_try_set_mwi(struct pci_dev *dev);
> > > void pci_clear_mwi(struct pci_dev *dev);
> > > void pci_intx(struct pci_dev *dev, int enable);
> > > +#ifdef CONFIG_PCI_MSI
> > > void pci_msi_off(struct pci_dev *dev);
> > > +#else
> > > +static inline void pci_msi_off(struct pci_dev *dev) {}
> > > +#endif
> > > int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size);
> > > int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask);
> > > int pcix_get_max_mmrbc(struct pci_dev *dev);
>
> According to the old commit f5f2b13129a6541debf8851bae843cbbf48298b7,
> pci_msi_off() was designed to be available even when msi support is not
> compiled in. So I think this change will make something wrong.
>
> Michael, could you check your patch?
>
>
> Thanks,
> H.Seto
You are right. I didn't think this through: we must disable
the capability at startup even if the current kernel does not
support MSI, otherwise the device won't work.
Please apply this on top.
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 31d8a12..7cb0084 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -780,11 +780,7 @@ int __must_check pci_set_mwi(struct pci_dev *dev);
int pci_try_set_mwi(struct pci_dev *dev);
void pci_clear_mwi(struct pci_dev *dev);
void pci_intx(struct pci_dev *dev, int enable);
-#ifdef CONFIG_PCI_MSI
void pci_msi_off(struct pci_dev *dev);
-#else
-static inline void pci_msi_off(struct pci_dev *dev) {}
-#endif
int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size);
int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask);
int pcix_get_max_mmrbc(struct pci_dev *dev);
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