linux-kernel - Re: [PATCH v2] Staging: rtl8192e: Fix sparse warning

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Date:	Sun, 06 Apr 2014 15:43:42 -0500
From:	Joel Pelaez Jorge <joelpelaez@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	devel@...verdev.osuosl.org, Silvan Jegen <s.jegen@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Staging: rtl8192e: Fix sparse warning

El 06/04/14 15:26, Greg Kroah-Hartman escribió:
> On Sun, Apr 06, 2014 at 02:12:44PM -0500, Joel Pelaez Jorge wrote:
>> El 06/04/14 14:01, Greg Kroah-Hartman escribió:
>>> On Sun, Apr 06, 2014 at 01:43:38PM -0500, Joel Pelaez Jorge wrote:
>>>> Fix a sparse warning, non static symbol is no declared as such.
>>>> And fix a conflict with static function declared extern to include
>>>> rtl_wx.h header.
>>>>
>>>> drivers/staging/rtl8192e/rtl8192e/rtl_wx.c:1323:24: warning:
>>>> symbol 'r8192_wx_handlers_def' was not declared. Should it be static?
>>>>
>>>> Signed-off-by: Joel Pelaez Jorge <joelpelaez@...il.com>
>>>> ---
>>>>     drivers/staging/rtl8192e/rtl8192e/rtl_wx.c |    3 ++-
>>>>     1 file changed, 2 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
>>>> b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
>>>> index 498995d..f17584d 100644
>>>> --- a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
>>>> +++ b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
>>>> @@ -19,6 +19,7 @@
>>>>
>>>>     #include <linux/string.h>
>>>>     #include "rtl_core.h"
>>>> +#include "rtl_wx.h"
>>>
>>> Why is this needed?
>>>
>>>>
>>>>     #define RATE_COUNT 12
>>>>     static u32 rtl8192_rates[] = {
>>>> @@ -1293,7 +1294,7 @@ static iw_handler r8192_private_handler[] = {
>>>>     	(iw_handler)r8192_wx_get_PromiscuousMode,
>>>>     };
>>>>
>>>> -static struct iw_statistics *r8192_get_wireless_stats(struct net_device
>>>> *dev)
>>>> +struct iw_statistics *r8192_get_wireless_stats(struct net_device *dev)
>>>
>>> Why make this global?  This doesn't have anything to do with the warning
>>> you are working on as described above.
>>>
>>> totally confused,
>>>
>>> greg k-h
>>>
>>   >
>> In the "rtl_wx.h" header declare extern 'r8192_wx_handlers_def'
>> but r8192_get_wireless_stats too.
> 
> I don't understand what this sentance means :(
> 
>> Because r8192_get_wireless_stats is used by rtl_core.h if WIRELESS_EXT
>> is more that 12 but less that 17.
> 
> Will that value ever change?
> 
> thanks,
> 
> greg k-h
> 
The file: 'rtl_wx.h' is a header that defines some symbols uses
externally by 'rtl_core.c', it declare:

extern struct iw_handler_def r8192_wx_handlers_def;
struct iw_statistics *r8192_get_wireless_stats(struct net_device *dev);

If this header is included in rtl_wx.c, fix the sparse warning, but
cause conflict with the function declaration, because in 'rtl_wx.c'
r8192_get_wireless_stats is defined as 'static'.

In the header is defined as 'extern' because is called by rtl_core.c
if the WIRELESS_EXT certain values.

By the way, WIRELESS_EXT is a define constant that indicate the
wireless extension version supported by the kernel it only up.
The better solution is remove the code that called the function, remove
the declaration and only keep 'r8192_wx_handlers_def'.
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