On Mon, Mar 24, 2014 at 12:42:46AM +0530, Monam Agarwal wrote: > This patch replaces rcu_assign_pointer(x, NULL) with RCU_INIT_POINTER(x, NULL) > > The rcu_assign_pointer() ensures that the initialization of a structure > is carried out before storing a pointer to that structure. > And in the case of the NULL pointer, there is no structure to initialize. > So, rcu_assign_pointer(p, NULL) can be safely converted to > RCU_INIT_POINTER(p, NULL) > > Signed-off-by: Monam Agarwal <monamagarwal...@gmail.com> No, I don't think this is right. __netpoll_cleanup can be called in parallel with bottom half access to dev->npinfo. rcu_assign pointer is safe against those accesses, but RCU_INIT_POINTER is not.
Neil > --- > net/core/netpoll.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/net/core/netpoll.c b/net/core/netpoll.c > index 7291dde..41c4e9c 100644 > --- a/net/core/netpoll.c > +++ b/net/core/netpoll.c > @@ -809,7 +809,7 @@ void __netpoll_cleanup(struct netpoll *np) > if (ops->ndo_netpoll_cleanup) > ops->ndo_netpoll_cleanup(np->dev); > > - rcu_assign_pointer(np->dev->npinfo, NULL); > + RCU_INIT_POINTER(np->dev->npinfo, NULL); > call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info); > } > } > -- > 1.7.9.5 > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
