linux-kernel - Re: [Outreachy kernel] Re: [PATCH] Staging: ccree: Don't use volatile for monitor

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Date:   Mon, 11 Sep 2017 12:10:40 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     Srishti Sharma <srishtishar@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Gilad Ben-Yossef <gilad@...yossef.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        driverdev-devel@...uxdriverproject.org, devel@...verdev.osuosl.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] Re: [PATCH] Staging: ccree: Don't use volatile
 for monitor_lock

On Mon, Sep 11, 2017 at 12:08 PM, Srishti Sharma <srishtishar@...il.com> wrote:
> On Mon, Sep 11, 2017 at 9:34 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
>> On Mon, Sep 11, 2017 at 09:29:31PM +0530, Srishti Sharma wrote:
>>> The use of volatile for the variable monitor_lock is unnecessary.
>>>
>>> Signed-off-by: Srishti Sharma <srishtishar@...il.com>
>>> ---
>>>  drivers/staging/ccree/ssi_request_mgr.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/staging/ccree/ssi_request_mgr.c b/drivers/staging/ccree/ssi_request_mgr.c
>>> index e5c2f92..7d77941 100644
>>> --- a/drivers/staging/ccree/ssi_request_mgr.c
>>> +++ b/drivers/staging/ccree/ssi_request_mgr.c
>>> @@ -49,7 +49,7 @@ struct ssi_request_mgr_handle {
>>>       dma_addr_t dummy_comp_buff_dma;
>>>       struct cc_hw_desc monitor_desc;
>>>
>>> -     volatile unsigned long monitor_lock;
>>> +     unsigned long monitor_lock;
>>
>> While volatile is not right, odds are, this is still totally wrong as
>> well.  How about using a "real" lock instead?
>
> I tried to find where is this variable being used in the code, but I
> didn't find any usage of it . It might be an important attribute of
> this structure definition but, I don't see it's value being set to
> anything or being used somewhere .
>

AFAICT, it's not used. Your patch should just remove it instead :)

Sean

> Regards,
> Srishti
>>
>> thanks,
>>
>> greg k-h
>
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