Re: [PATCH] IB/mlx5: add checking for "vf" from do_setvfinfo()

[Dan Carpenter <dan.carpenter@oracle.com>]

On Tue, Apr 16, 2019 at 10:54:42PM +0000, Parav Pandit wrote:
> > Yeah.  But the call tree here is:
> > 
> > do_setvfinfo()
> > -> ops->ndo_get_vf_config()
> >    -> rtnl_fill_vfinfo()
> >       -> dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi)
> >          -> ipoib_get_vf_config()
> >             -> ib_get_vf_config
> >                -> device->ops.get_vf_config(device, vf, port, info);
> > 
> > Changing the ->ndo_get_vf_config() pointer means you have to update 20
> > functions in various drivers.  It becomes quite involved.  We should apply
> > this simple self contained fix then worry about doing other cleanups later.
> > 
> But if a static checker is run on following functions, they need for vf < 0 check.
> 
> i40e_ndo_get_vf_config
> mlx5e_get_vf_config
> bnxt_get_vf_config
> etc and few more.

I checked again to see if it was "20 functions" or if it was "etc and
few more"...  It turns out its only 18 functions because I double
counted two functions at first.  Here is the list:

be_get_vf_config
bnx2x_get_vf_config
bnxt_get_vf_config
cxgb4_mgmt_get_vf_config
efx_sriov_get_vf_config
fm10k_ndo_get_vf_config
i40e_ndo_get_vf_config
ice_get_vf_cfg
igb_ndo_get_vf_config
ipoib_get_vf_config
ixgbe_ndo_get_vf_config
liquidio_get_vf_config
mlx4_en_get_vf_config
mlx5e_get_vf_config
nfp_app_get_vf_config
nsim_get_vf_config
qede_get_vf_config
qlcnic_sriov_get_vf_config

But you also have to update the call tress as well...  It's really very
involved.  I seriously did look at how to do this and the original patch
is the Right Thing To Do [tm].  I've probably sent around 92 underflow
patches and sometimes I would definitely agree with you that changing
the type is the right fix but not in this case.

regards,
dan carpenter