linux-kernel - Re: [PATCH 1/1] kprobes: Deletion of an unnecessary check before the function call "module

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Message-ID: <546C41EF.4040502@users.sourceforge.net>
Date:	Wed, 19 Nov 2014 08:08:31 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Coccinelle <cocci@...teme.lip6.fr>
Subject: Re: [PATCH 1/1] kprobes: Deletion of an unnecessary check before
 the function call "module_put"

>> index 3995f54..f1e7d45 100644
>> --- a/kernel/kprobes.c
>> +++ b/kernel/kprobes.c
>> @@ -1527,8 +1527,7 @@ int register_kprobe(struct kprobe *p)
>>  out:
>>  	mutex_unlock(&kprobe_mutex);
>>  
>> -	if (probed_mod)
>> -		module_put(probed_mod);
>> +	module_put(probed_mod);
> 
> This is OK, but I you request a comment line over there so that
> code reader can understand it is safe to pass a NULL pointer to
> module_put().

Do you want that I replace the shown null pointer check by a short
comment which repeats an expectation for the affected function call?

Regards,
Markus

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