On Sat, 30 Sep 2017, Srishti Sharma wrote:
> On Sat, Sep 30, 2017 at 11:36 AM, Julia Lawall <julia.lawall@xxxxxxx> wrote:
> >
> >
> > On Sat, 30 Sep 2017, Srishti Sharma wrote:
> >
> >> On Sat, Sep 30, 2017 at 10:35 AM, Julia Lawall <julia.lawall@xxxxxxx> wrote:
> >> >
> >> >
> >> > On Sat, 30 Sep 2017, Srishti Sharma wrote:
> >> >
> >> >> For variables of the type struct list_head* use list_entry to access
> >> >> the current list element instead of using container_of.
> >> >> Done using the following semantic patch by coccinelle.
> >> >>
> >> >> @r@
> >> >> identifier e;
> >> >> struct list_head* l;
> >> >> @@
> >> >>
> >> >> <... when != l == NULL
> >> >> l;
> >> >> ...>
> >> > I don't see what is the goal of the above code. The list_head variable is
> >> > not going to be in a statement by itself. There is also no need to check
> >> > for l being NULL. If it is NULL, the original code is incorrect too.
> >>
> >> Since only those container_of are to replaced with list_entry which
> >> have a variable of type list_head* , I wanted to check if it occurs
> >> anywhere before
> >> container_of ,
> >
> > Why? If it is a list, then it seems appropriate to access it using
> > list_head.
> >
> >> which it only does in it's declaration , because it
> >> can't be in any
> >> statement by itself . I think it will be better to write .
> >>
> >> @r@
> >> identifier e;
> >> struct list_head* l;
> >> @@
> >>
> >> <...
> >> container_of(l,...);
> >> ...>
> >
> > This doesn't ensure that there is a preceding container_of, if that is
> > what you are trying to do. The problem is that <... P ...> finds 0 or
> > more occurrences of pattern P, not 1 or more occurrences. 1 or more
> > occurrences is <+... P ...+>. But it would be simpler if you want an
> > occurrence of container_of before the thing you are transforming to put
> >
> > container_of(l,...);
> > ...
> > e = ...
> >
> > But this doesn't make sense either, partly because the preceding
> > container_of is just not needed, and also because a container_of would not
> > be in a statement by itself. In Coccinelle, when you put a ; after
> > something is means that the thing is a complete statement, not just the
> > end half of a statement.
>
> So , I guess we can simply write.
>
> e =
> -container_of
> +list_entry
> (l,...)
Yes. You don't even need the e =. As long as there is a call to
container_of on a list_head * value, you can change it.
julia
>
> Regards,
> Srishti
>
> >
> > julia
> >
> >> e =
> >> -container_of
> >> +list_entry
> >> (
> >> ....)
> >>
> >> >> (
> >> >> e =
> >> >> -container_of
> >> >> +list_entry
> >> >> (
> >> >> ...)
> >> >> )
> >> >
> >> > Here you don't need the outer ( ). This makes a disjunction with only
> >> > one choice. Since there is only one choice, you don't need the
> >> > disjunction.
> >>
> >> Thanks a lot , for pointing out the errors .
> >>
> >> Regards,
> >> Srishti
> >> > julia
> >> >
> >> >> Signed-off-by: Srishti Sharma <srishtishar@xxxxxxxxx>
> >> >> ---
> >> >> drivers/staging/rtl8188eu/core/rtw_sta_mgt.c | 12 ++++++------
> >> >> 1 file changed, 6 insertions(+), 6 deletions(-)
> >> >>
> >> >> diff --git a/drivers/staging/rtl8188eu/core/rtw_sta_mgt.c b/drivers/staging/rtl8188eu/core/rtw_sta_mgt.c
> >> >> index 22cf362..f9df4ac 100644
> >> >> --- a/drivers/staging/rtl8188eu/core/rtw_sta_mgt.c
> >> >> +++ b/drivers/staging/rtl8188eu/core/rtw_sta_mgt.c
> >> >> @@ -152,8 +152,8 @@ u32 _rtw_free_sta_priv(struct sta_priv *pstapriv)
> >> >> while (phead != plist) {
> >> >> int i;
> >> >>
> >> >> - psta = container_of(plist, struct sta_info,
> >> >> - hash_list);
> >> >> + psta = list_entry(plist, struct sta_info,
> >> >> + hash_list);
> >> >> plist = plist->next;
> >> >>
> >> >> for (i = 0; i < 16; i++) {
> >> >> @@ -323,7 +323,7 @@ u32 rtw_free_stainfo(struct adapter *padapter, struct sta_info *psta)
> >> >> plist = phead->next;
> >> >>
> >> >> while (!list_empty(phead)) {
> >> >> - prframe = container_of(plist, struct recv_frame, list);
> >> >> + prframe = list_entry(plist, struct recv_frame, list);
> >> >>
> >> >> plist = plist->next;
> >> >>
> >> >> @@ -399,7 +399,7 @@ void rtw_free_all_stainfo(struct adapter *padapter)
> >> >> plist = phead->next;
> >> >>
> >> >> while (phead != plist) {
> >> >> - psta = container_of(plist, struct sta_info, hash_list);
> >> >> + psta = list_entry(plist, struct sta_info, hash_list);
> >> >>
> >> >> plist = plist->next;
> >> >>
> >> >> @@ -435,7 +435,7 @@ struct sta_info *rtw_get_stainfo(struct sta_priv *pstapriv, u8 *hwaddr)
> >> >> plist = phead->next;
> >> >>
> >> >> while (phead != plist) {
> >> >> - psta = container_of(plist, struct sta_info, hash_list);
> >> >> + psta = list_entry(plist, struct sta_info, hash_list);
> >> >>
> >> >> if ((!memcmp(psta->hwaddr, addr, ETH_ALEN)) == true) {
> >> >> /* if found the matched address */
> >> >> @@ -493,7 +493,7 @@ u8 rtw_access_ctrl(struct adapter *padapter, u8 *mac_addr)
> >> >> phead = get_list_head(pacl_node_q);
> >> >> plist = phead->next;
> >> >> while (phead != plist) {
> >> >> - paclnode = container_of(plist, struct rtw_wlan_acl_node, list);
> >> >> + paclnode = list_entry(plist, struct rtw_wlan_acl_node, list);
> >> >> plist = plist->next;
> >> >>
> >> >> if (!memcmp(paclnode->addr, mac_addr, ETH_ALEN)) {
> >> >> --
> >> >> 2.7.4
> >> >>
> >> >> --
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> >> >> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/1506734581-10932-1-git-send-email-srishtishar%40gmail.com.
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> >> >>
> >>
>
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