[PATCH] staging: rtl8712: Add comment to lock declaration

[PATCH] staging: rtl8712: Add comment to lock declaration

[Jules Irenge]

Add comment to spinlock declaration to fix warning issued by checkpatch.pl
"CHECK: spinlock_t definition without comment".

Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
---
 drivers/staging/rtl8712/drv_types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8712/drv_types.h b/drivers/staging/rtl8712/drv_types.h
index 0c4325073c63..960d8709aada 100644
--- a/drivers/staging/rtl8712/drv_types.h
+++ b/drivers/staging/rtl8712/drv_types.h
@@ -160,7 +160,7 @@ struct _adapter {
 	int pid; /*process id from UI*/
 	struct work_struct wk_filter_rx_ff0;
 	u8 blnEnableRxFF0Filter;
-	spinlock_t lock_rx_ff0_filter;
+	spinlock_t lock_rx_ff0_filter; /*spinlock to protect interrupt request*/
 	const struct firmware *fw;
 	struct usb_interface *pusb_intf;
 	struct mutex mutex_start;
-- 
2.21.0

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Re: [Outreachy kernel] [PATCH] staging: rtl8712: Add comment to lock declaration

[Julia Lawall]

On Mon, 7 Oct 2019, Jules Irenge wrote:

> Add comment to spinlock declaration to fix warning issued by checkpatch.pl
> "CHECK: spinlock_t definition without comment".

Since it is not apparent from the shown code, it would be helpful to
describe what evidence you used to choose this comment.

thanks,
julia

>
> Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
> ---
>  drivers/staging/rtl8712/drv_types.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/rtl8712/drv_types.h b/drivers/staging/rtl8712/drv_types.h
> index 0c4325073c63..960d8709aada 100644
> --- a/drivers/staging/rtl8712/drv_types.h
> +++ b/drivers/staging/rtl8712/drv_types.h
> @@ -160,7 +160,7 @@ struct _adapter {
>  	int pid; /*process id from UI*/
>  	struct work_struct wk_filter_rx_ff0;
>  	u8 blnEnableRxFF0Filter;
> -	spinlock_t lock_rx_ff0_filter;
> +	spinlock_t lock_rx_ff0_filter; /*spinlock to protect interrupt request*/
>  	const struct firmware *fw;
>  	struct usb_interface *pusb_intf;
>  	struct mutex mutex_start;
> --
> 2.21.0
>
> --
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Re: [Outreachy kernel] [PATCH] staging: rtl8712: Add comment to lock declaration

[Jules Irenge]

On Mon, 7 Oct 2019, Julia Lawall wrote:

>
>
> On Mon, 7 Oct 2019, Jules Irenge wrote:
>
>> Add comment to spinlock declaration to fix warning issued by checkpatch.pl
>> "CHECK: spinlock_t definition without comment".
>
> Since it is not apparent from the shown code, it would be helpful to
> describe what evidence you used to choose this comment.
>
> thanks,
> julia
>

Thanks for your feedback, I will leave as it is following the advice of 
one of the maintainer. I thought a general term of protecting interrupt 
might be appropriate.

Kind regards
Jules


>> Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
>> ---
>>  drivers/staging/rtl8712/drv_types.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/rtl8712/drv_types.h b/drivers/staging/rtl8712/drv_types.h
>> index 0c4325073c63..960d8709aada 100644
>> --- a/drivers/staging/rtl8712/drv_types.h
>> +++ b/drivers/staging/rtl8712/drv_types.h
>> @@ -160,7 +160,7 @@ struct _adapter {
>>  	int pid; /*process id from UI*/
>>  	struct work_struct wk_filter_rx_ff0;
>>  	u8 blnEnableRxFF0Filter;
>> -	spinlock_t lock_rx_ff0_filter;
>> +	spinlock_t lock_rx_ff0_filter; /*spinlock to protect interrupt request*/
>>  	const struct firmware *fw;
>>  	struct usb_interface *pusb_intf;
>>  	struct mutex mutex_start;
>> --
>> 2.21.0
>>
>> --
>> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
>> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
>> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20191007205248.24466-1-jbi.octave%40gmail.com.
>>
>
> -- 
> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/alpine.DEB.2.21.1910072254290.2578%40hadrien.
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Re: [PATCH] staging: rtl8712: Add comment to lock declaration

[Dan Carpenter]

On Mon, Oct 07, 2019 at 09:52:48PM +0100, Jules Irenge wrote:
> Add comment to spinlock declaration to fix warning issued by checkpatch.pl
> "CHECK: spinlock_t definition without comment".
> 
> Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
> ---
>  drivers/staging/rtl8712/drv_types.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8712/drv_types.h b/drivers/staging/rtl8712/drv_types.h
> index 0c4325073c63..960d8709aada 100644
> --- a/drivers/staging/rtl8712/drv_types.h
> +++ b/drivers/staging/rtl8712/drv_types.h
> @@ -160,7 +160,7 @@ struct _adapter {
>  	int pid; /*process id from UI*/
>  	struct work_struct wk_filter_rx_ff0;
>  	u8 blnEnableRxFF0Filter;
> -	spinlock_t lock_rx_ff0_filter;
> +	spinlock_t lock_rx_ff0_filter; /*spinlock to protect interrupt request*/

This spinlock seems to be nonsense.  It's only used one time:

drivers/staging/rtl8712/xmit_linux.c
    94  void r8712_SetFilter(struct work_struct *work)
    95  {
    96          struct _adapter *adapter = container_of(work, struct _adapter,
    97                                                  wk_filter_rx_ff0);
    98          u8  oldvalue = 0x00, newvalue = 0x00;
    99          unsigned long irqL;
   100  
   101          oldvalue = r8712_read8(adapter, 0x117);
   102          newvalue = oldvalue & 0xfe;
   103          r8712_write8(adapter, 0x117, newvalue);
   104  
   105          spin_lock_irqsave(&adapter->lock_rx_ff0_filter, irqL);
   106          adapter->blnEnableRxFF0Filter = 1;

It only protects writing to ->blnEnableRxFF0Filter but it doesn't
protect reading so it can't possibly work.

   107          spin_unlock_irqrestore(&adapter->lock_rx_ff0_filter, irqL);
   108          do {
   109                  msleep(100);
   110          } while (adapter->blnEnableRxFF0Filter == 1);
   111          r8712_write8(adapter, 0x117, oldvalue);
   112  }

Also put a space after /* and before */ so the comment looks like:
	/* spinlock to protect interrupt request */

But in this case, the comment isn't correct so please just leave it
as-is until someone can fix the locking.

regards,
dan carpenter

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