linux-kernel - Re: [PATCH 5/5] staging/otus: Move a dereference below a NULL test

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Message-ID: <4A587245.1080304@gmail.com>
Date:	Sat, 11 Jul 2009 13:06:45 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
CC:	Julia Lawall <julia@...u.dk>, gregkh@...e.de,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 5/5] staging/otus: Move a dereference below a NULL test

On 07/11/2009 12:17 PM, Jaswinder Singh Rajput wrote:
> On Sat, 2009-07-11 at 10:17 +0200, Jiri Slaby wrote:
>> On 07/11/2009 09:51 AM, Julia Lawall wrote:
>>> --- a/drivers/staging/otus/wwrap.c
>>> +++ b/drivers/staging/otus/wwrap.c
>>> @@ -1016,12 +1016,13 @@ void kevent(struct work_struct *work)
>>>  {
>>>      struct usbdrv_private *macp =
>>>                 container_of(work, struct usbdrv_private, kevent);
>>> -    zdev_t *dev = macp->device;
>>> +    zdev_t *dev;
>>>  
>>>      if (macp == NULL)
>>>      {
>>>          return;
>>>      }
>>
>> The test is rather useless here.
>>
> 
> Why useless, it should be non-null before setting to dev.

Even if work was NULL, macp won't be NULL.

> But issue is why function name like kevent() is global and who is using
> it.

Since it's not declared, I guess nobody but keventd. It should be static.
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