linux-kernel - Re: [Outreachy kernel] [PATCH] Staging: rtl8188eu: core: Use list_entry instead of container

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Date:   Sat, 30 Sep 2017 11:31:17 +0530
From:   Srishti Sharma <srishtishar@...il.com>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     Greg KH <gregkh@...uxfoundation.org>, devel@...verdev.osuosl.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        outreachy-kernel <outreachy-kernel@...glegroups.com>
Subject: Re: [Outreachy kernel] [PATCH] Staging: rtl8188eu: core: Use
 list_entry instead of container_of

On Sat, Sep 30, 2017 at 10:35 AM, Julia Lawall <julia.lawall@...6.fr> 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 , 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,...);
...>

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@...il.com>
>> ---
>>  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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