Re: [wireless-next:for-davem 87/99] net/ipv4/ip_vti.c:193:17: sparse: incorrect type in assignment (

[Fengguang Wu <fengguang.wu@intel.com>]

On Wed, Jul 18, 2012 at 10:06:07PM -0700, Saurabh Mohan wrote:
> 
> ----- Original Message -----
> > Hi Saurabh,
> > 
> > There are new sparse warnings show up in
> > 
> > tree:
> >   git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next.git
> > for-davem
> > head:   ddbe503203855939946430e39bae58de11b70b69
> > commit: 1181412c1a671ed4e8fb1736f17e6ec617c68059 [87/99] net/ipv4:
> > VTI support new module for ip_vti.
> > 
> > All sparse warnings:
> > 
> > + net/ipv4/ip_vti.c:193:17: sparse: incorrect type in assignment
> > (different address spaces)
> >   net/ipv4/ip_vti.c:193:17:    expected struct ip_tunnel [noderef]
> >   <asn:4>**tp
> >   net/ipv4/ip_vti.c:193:17:    got struct ip_tunnel **
> > + net/ipv4/ip_vti.c:205:49: sparse: incorrect type in initializer
> > (different address spaces)
> >   net/ipv4/ip_vti.c:205:49:    expected struct ip_tunnel [noderef]
> >   <asn:4>**tp
> >   net/ipv4/ip_vti.c:205:49:    got struct ip_tunnel **
> >   net/ipv4/ip_vti.c:223:17: sparse: incorrect type in assignment
> >   (different address spaces)
> >   net/ipv4/ip_vti.c:223:17:    expected struct ip_tunnel [noderef]
> >   <asn:4>**tp
> >   net/ipv4/ip_vti.c:223:17:    got struct ip_tunnel **
> > + net/ipv4/ip_vti.c:693:29: sparse: incompatible types in comparison
> > expression (different address spaces)
> > 
> > vim +193 net/ipv4/ip_vti.c
> >    190		struct ip_tunnel __rcu **tp;
> >    191		struct ip_tunnel *iter;
> >    192
> >  > 193		for (tp = vti_bucket(ipn, t);
> >    194		     (iter = rtnl_dereference(*tp)) != NULL;
> >    195		     tp = &iter->next) {
> >    196			if (t = iter) {
> > 
> > Which can be fixed by adding some rcu_*() accessors to the RCU
> > protected pointers.
> >
> 
> Thanks for catching this. I assume I submit the fix to net-next
> and you will take it from there?

Yeah it works: new net-next commits will be auto build tested :)

Thanks,
Fengguang