2017-09-11 15:59:42

by Srishti Sharma

Subject: [PATCH] Staging: ccree: Don't use volatile for monitor_lock

The use of volatile for the variable monitor_lock is unnecessary.

Signed-off-by: Srishti Sharma <[email protected]>
---
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;
#ifdef COMP_IN_WQ
struct workqueue_struct *workq;
struct delayed_work compwork;

2017-09-11 16:03:02

by Julia Lawall

Subject: Re: [Outreachy kernel] [PATCH] Staging: ccree: Don't use volatile for monitor_lock

On Mon, 11 Sep 2017, Srishti Sharma wrote:

> The use of volatile for the variable monitor_lock is unnecessary.

You need to give more evidence of why this is the case. How is the
variable used? I guess this comes from checkpatch, but checkpatch has
only a local view of things, and doesn't know how the variable is used.

julia

>
> Signed-off-by: Srishti Sharma <[email protected]>
> ---
> 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;
> #ifdef COMP_IN_WQ
> struct workqueue_struct *workq;
> struct delayed_work compwork;
> --
> 2.7.4
>
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2017-09-11 16:04:49

by Greg Kroah-Hartman

Subject: Re: [PATCH] Staging: ccree: Don't use volatile for monitor_lock

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 <[email protected]>
> ---
> 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?

thanks,

greg k-h

2017-09-11 16:08:04

by Srishti Sharma

Subject: Re: [PATCH] Staging: ccree: Don't use volatile for monitor_lock

On Mon, Sep 11, 2017 at 9:34 PM, Greg KH <[email protected]> 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 <[email protected]>
>> ---
>> 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 .

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

2017-09-11 16:11:06

by Sean Paul

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 <[email protected]> wrote:
> On Mon, Sep 11, 2017 at 9:34 PM, Greg KH <[email protected]> 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 <[email protected]>
>>> ---
>>> 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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2017-09-11 16:11:46

by Julia Lawall

Subject: Re: [Outreachy kernel] Re: [PATCH] Staging: ccree: Don't use volatile for monitor_lock

On Mon, 11 Sep 2017, Srishti Sharma wrote:

> On Mon, Sep 11, 2017 at 9:34 PM, Greg KH <[email protected]> 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 <[email protected]>
> >> ---
> >> 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 .

Try removing it and see if the code still compiles. There is always a
danger that a use of something could be constructed using ## in a macro,
although given the uses of ## for this driver, it doesn't seem likely
here.

julia

2017-09-11 16:15:10

by Srishti Sharma

Subject: Re: [Outreachy kernel] Re: [PATCH] Staging: ccree: Don't use volatile for monitor_lock

On Mon, Sep 11, 2017 at 9:41 PM, Julia Lawall <[email protected]> wrote:
>
>
> On Mon, 11 Sep 2017, Srishti Sharma wrote:
>
>> On Mon, Sep 11, 2017 at 9:34 PM, Greg KH <[email protected]> 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 <[email protected]>
>> >> ---
>> >> 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 .
>
> Try removing it and see if the code still compiles. There is always a
> danger that a use of something could be constructed using ## in a macro,
> although given the uses of ## for this driver, it doesn't seem likely
> here.

Yes, I'll do that.

Regards,
Srishti
>
> julia

2017-09-11 16:34:39

by Srishti Sharma

Subject: Re: [Outreachy kernel] Re: [PATCH] Staging: ccree: Don't use volatile for monitor_lock

On Mon, Sep 11, 2017 at 9:45 PM, Srishti Sharma <[email protected]> wrote:
> On Mon, Sep 11, 2017 at 9:41 PM, Julia Lawall <[email protected]> wrote:
>>
>>
>> On Mon, 11 Sep 2017, Srishti Sharma wrote:
>>
>>> On Mon, Sep 11, 2017 at 9:34 PM, Greg KH <[email protected]> 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 <[email protected]>
>>> >> ---
>>> >> 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 .
>>
>> Try removing it and see if the code still compiles. There is always a
>> danger that a use of something could be constructed using ## in a macro,
>> although given the uses of ## for this driver, it doesn't seem likely
>> here.

It compiles, so I have removed the variable and sent another patch

Thanks,
Srishti

>
> Yes, I'll do that.
>
> Regards,
> Srishti
>>
>> julia

2017-09-12 09:19:51

by Dan Carpenter

Subject: Re: [PATCH] Staging: ccree: Don't use volatile for monitor_lock

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 <[email protected]>
> ---
> 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;

The variable seems unused. Try deleting it instead.

regards,
dan carpenter

2017-09-12 12:05:22

by Srishti Sharma

Subject: Re: [PATCH] Staging: ccree: Don't use volatile for monitor_lock

On Tue, Sep 12, 2017 at 2:49 PM, Dan Carpenter <[email protected]> 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 <[email protected]>
>> ---
>> 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;
>
> The variable seems unused. Try deleting it instead.

Had already sent a patch for that as v2.

Thanks
Srishti

> regards,
> dan carpenter
>