linux-kernel - Re: [PATCH] cdc-acm: Destroy acm

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Message-ID: <1436439959.1682.0.camel@suse.com>
Date:	Thu, 09 Jul 2015 13:05:59 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Johannes Thumshirn <jthumshirn@...e.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cdc-acm: Destroy acm_minors IDR on module exit

On Wed, 2015-07-08 at 17:25 +0200, Johannes Thumshirn wrote:
> Destroy acm_minors IDR on module exit, reclaiming the allocated
> memory.
> 
> This was detected by the following semantic patch (written by Luis
> Rodriguez
> <mcgrof@...e.com>)
> <SmPL>
> @ defines_module_init @
> declarer name module_init, module_exit;
> declarer name DEFINE_IDR;
> identifier init;
> @@
> 
> module_init(init);
> 
> @ defines_module_exit @
> identifier exit;
> @@
> 
> module_exit(exit);
> 
> @ declares_idr depends on defines_module_init && defines_module_exit @
> identifier idr;
> @@
> 
> DEFINE_IDR(idr);
> 
> @ on_exit_calls_destroy depends on declares_idr && defines_module_exit
> @
> identifier declares_idr.idr, defines_module_exit.exit;
> @@
> 
> exit(void)
> {
>  ...
>  idr_destroy(&idr);
>  ...
> }
> 
> @ missing_module_idr_destroy depends on declares_idr &&
> defines_module_exit && !on_exit_calls_destroy @
> identifier declares_idr.idr, defines_module_exit.exit;
> @@
> 
> exit(void)
> {
>  ...
>  +idr_destroy(&idr);
>  }
> </SmPL>
> 
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
Acked-by: Oliver Neukum <oneukum@...e.com>


-- 
Oliver Neukum <oneukum@...e.com>

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