Code is using knowledge that nf_sockopt_ops::list list_head is first field in structure by using casts. Switch to list_for_each_entry() itetators while I am at it. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> --- net/netfilter/nf_sockopt.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) --- a/net/netfilter/nf_sockopt.c +++ b/net/netfilter/nf_sockopt.c @@ -23,14 +23,13 @@ static inline int overlap(int min1, int max1, int min2, int max2) /* Functions to register sockopt ranges (exclusive). */ int nf_register_sockopt(struct nf_sockopt_ops *reg) { - struct list_head *i; + struct nf_sockopt_ops *ops; int ret = 0; if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) return -EINTR; - list_for_each(i, &nf_sockopts) { - struct nf_sockopt_ops *ops = (struct nf_sockopt_ops *)i; + list_for_each_entry(ops, &nf_sockopts, list) { if (ops->pf == reg->pf && (overlap(ops->set_optmin, ops->set_optmax, reg->set_optmin, reg->set_optmax) @@ -65,7 +64,6 @@ EXPORT_SYMBOL(nf_unregister_sockopt); static int nf_sockopt(struct sock *sk, int pf, int val, char __user *opt, int *len, int get) { - struct list_head *i; struct nf_sockopt_ops *ops; int ret; @@ -75,8 +73,7 @@ static int nf_sockopt(struct sock *sk, int pf, int val, if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) return -EINTR; - list_for_each(i, &nf_sockopts) { - ops = (struct nf_sockopt_ops *)i; + list_for_each_entry(ops, &nf_sockopts, list) { if (ops->pf == pf) { if (!try_module_get(ops->owner)) goto out_nosup; @@ -135,8 +132,7 @@ static int compat_nf_sockopt(struct sock *sk, int pf, int val, if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) return -EINTR; - list_for_each(i, &nf_sockopts) { - ops = (struct nf_sockopt_ops *)i; + list_for_each_entry(ops, &nf_sockopts, list) { if (ops->pf == pf) { if (!try_module_get(ops->owner)) goto out_nosup;
Re: [PATCH] nf_sockopts list head cleanup
Alexey Dobriyan wrote: > Code is using knowledge that nf_sockopt_ops::list list_head is first > field in structure by using casts. Switch to list_for_each_entry() > itetators while I am at it. > > Applied with a minor warning fix in the compat path, thanks Alexey.