* [PATCH] staging: rtl8712: Add comment to lock declaration
@ 2019-10-07 20:52 Jules Irenge
2019-10-07 20:55 ` [Outreachy kernel] " Julia Lawall
2019-10-08 6:16 ` Dan Carpenter
0 siblings, 2 replies; 4+ messages in thread
From: Jules Irenge @ 2019-10-07 20:52 UTC (permalink / raw)
To: outreachy-kernel; +Cc: devel, gregkh, Jules Irenge, Larry.Finger
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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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [Outreachy kernel] [PATCH] staging: rtl8712: Add comment to lock declaration
2019-10-07 20:52 [PATCH] staging: rtl8712: Add comment to lock declaration Jules Irenge
@ 2019-10-07 20:55 ` Julia Lawall
2019-10-09 11:18 ` Jules Irenge
2019-10-08 6:16 ` Dan Carpenter
1 sibling, 1 reply; 4+ messages in thread
From: Julia Lawall @ 2019-10-07 20:55 UTC (permalink / raw)
To: Jules Irenge; +Cc: devel, outreachy-kernel, Larry.Finger, gregkh
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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>
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] staging: rtl8712: Add comment to lock declaration
2019-10-07 20:52 [PATCH] staging: rtl8712: Add comment to lock declaration Jules Irenge
2019-10-07 20:55 ` [Outreachy kernel] " Julia Lawall
@ 2019-10-08 6:16 ` Dan Carpenter
1 sibling, 0 replies; 4+ messages in thread
From: Dan Carpenter @ 2019-10-08 6:16 UTC (permalink / raw)
To: Jules Irenge; +Cc: devel, outreachy-kernel, Larry.Finger, gregkh
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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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Outreachy kernel] [PATCH] staging: rtl8712: Add comment to lock declaration
2019-10-07 20:55 ` [Outreachy kernel] " Julia Lawall
@ 2019-10-09 11:18 ` Jules Irenge
0 siblings, 0 replies; 4+ messages in thread
From: Jules Irenge @ 2019-10-09 11:18 UTC (permalink / raw)
To: Julia Lawall; +Cc: devel, outreachy-kernel, Jules Irenge, Larry.Finger, gregkh
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.
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>
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2019-10-07 20:55 ` [Outreachy kernel] " Julia Lawall
2019-10-09 11:18 ` Jules Irenge
2019-10-08 6:16 ` Dan Carpenter
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