linux-kernel - Re: [PATCH] rtl8188eu: rtw_xmit: Replace rcu_dereference() with rcu_access

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Date:	Tue, 9 Sep 2014 16:22:03 +0300
From:	Andreea Bernat <bernat.ada@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Larry.Finger@...inger.net, navin patidar <navin.patidar@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] rtl8188eu: rtw_xmit: Replace rcu_dereference() with rcu_access_pointer()

The rcu_dereference() calls are no longer there.
They were removed.

Sorry,
Andreea


2014-09-08 23:48 GMT+03:00 Greg KH <gregkh@...uxfoundation.org>:
> On Thu, Sep 04, 2014 at 08:15:48PM +0300, Andreea-Cristina Bernat wrote:
>> The "br_port" local variables obtained through the rcu_dereference() calls are
>> not dereferenced in the rest of their function.
>> Therefore, it is recommended to use rcu_access_pointer() instead of
>> rcu_dereference().
>> This patch makes the replacements.
>>
>> The first step to detect this was made with the following Coccinelle semantic
>> patch:
>> @@
>> identifier p;
>> @@
>>
>> * p = rcu_dereference(...)
>> ... when any
>>     when != p
>> (
>> * if( (<+...p...+>) ) { ... }
>> |
>> * while( (<+...p...+>) ) { ... }
>> )
>> ... when != p
>>
>> After the analysis of the output, the change was made manually.
>>
>> Signed-off-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
>> ---
>>  drivers/staging/rtl8188eu/core/rtw_xmit.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/staging/rtl8188eu/core/rtw_xmit.c b/drivers/staging/rtl8188eu/core/rtw_xmit.c
>> index 1413ec8..93228dc 100644
>> --- a/drivers/staging/rtl8188eu/core/rtw_xmit.c
>> +++ b/drivers/staging/rtl8188eu/core/rtw_xmit.c
>> @@ -1684,7 +1684,7 @@ static int rtw_br_client_tx(struct adapter *padapter, struct sk_buff **pskb)
>>       void *br_port = NULL;
>>
>>       rcu_read_lock();
>> -     br_port = rcu_dereference(padapter->pnetdev->rx_handler_data);
>> +     br_port = rcu_access_pointer(padapter->pnetdev->rx_handler_data);
>>       rcu_read_unlock();
>>       spin_lock_bh(&padapter->br_ext_lock);
>>       if (!(skb->data[0] & 1) && br_port &&
>> @@ -1868,7 +1868,7 @@ s32 rtw_xmit(struct adapter *padapter, struct sk_buff **ppkt)
>>       }
>>
>>       rcu_read_lock();
>> -     br_port = rcu_dereference(padapter->pnetdev->rx_handler_data);
>> +     br_port = rcu_access_pointer(padapter->pnetdev->rx_handler_data);
>>       rcu_read_unlock();
>>
>>       if (br_port && check_fwstate(pmlmepriv, WIFI_STATION_STATE|WIFI_ADHOC_STATE)) {
>
> This patch doesn't apply at all to my staging-next branch of the
> staging.git tree on git.kernel.org :(
>
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