linux-kernel - Re: [PATCH] uio: Destroy uio

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Message-ID: <20150708172430.GA14727@kroah.com>
Date:	Wed, 8 Jul 2015 10:24:30 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Johannes Thumshirn <jthumshirn@...e.de>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uio: Destroy uio_idr on module exit

On Wed, Jul 08, 2015 at 05:24:46PM +0200, Johannes Thumshirn wrote:
> Destroy uio_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>

Nice work.  Shouldn't we do the same thing for ida_destroy() as well?  I
see 4 USB drivers that need this same fix for that structure.

thanks,

greg k-h
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