[PATCH RFC 02/17] of: Do not return struct iommu_ops from of_iommu_configure()

[Jerry Snitselaar]

On Fri, Nov 03, 2023 at 02:42:01PM -0700, Jerry Snitselaar wrote:
> On Fri, Nov 03, 2023 at 01:44:47PM -0300, Jason Gunthorpe wrote:
> > Nothing needs this pointer. Return a normal error code with the usual
> > IOMMU semantic that ENODEV means 'there is no IOMMU driver'.
> > 
> > Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
> > ---
> >  drivers/iommu/of_iommu.c | 29 ++++++++++++++++++-----------
> >  drivers/of/device.c      | 22 +++++++++++++++-------
> >  include/linux/of_iommu.h | 13 ++++++-------
> >  3 files changed, 39 insertions(+), 25 deletions(-)
> > 
> > diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
> > index 157b286e36bf3a..e2fa29c16dd758 100644
> > --- a/drivers/iommu/of_iommu.c
> > +++ b/drivers/iommu/of_iommu.c
> > @@ -107,20 +107,26 @@ static int of_iommu_configure_device(struct device_node *master_np,
> >  		      of_iommu_configure_dev(master_np, dev);
> >  }
> >  
> > -const struct iommu_ops *of_iommu_configure(struct device *dev,
> > -					   struct device_node *master_np,
> > -					   const u32 *id)
> > +/*
> > + * Returns:
> > + *  0 on success, an iommu was configured
> > + *  -ENODEV if the device does not have any IOMMU
> > + *  -EPROBEDEFER if probing should be tried again
> > + *  -errno fatal errors
> 
> It looks to me like it will only return 0, -ENODEV, or -EPROBEDEFER
> with other -errno getting boiled down to -ENODEV.
> 

Ah, I should've looked at the next patch first. So, never mind on this
and the question about the dev_dbg.


Reviewed-by: Jerry Snitselaar <jsnitsel at redhat.com>