linux-kernel - Re: [PATCH] st: Destroy st_index

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Message-ID: <559F68C8.4050400@suse.de>
Date:	Fri, 10 Jul 2015 08:40:08 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Johannes Thumshirn <jthumshirn@...e.de>,
	Kai Mäkisara 
	<Kai.Makisara@...umbus.fi>,
	"James E.J. Bottomley" <JBottomley@...n.com>
CC:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] st: Destroy st_index_idr on module exit

On 07/08/2015 05:24 PM, Johannes Thumshirn wrote:
> Destroy st_index_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>
> ---
>  drivers/scsi/st.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
> index 3f25b8f..79ac024 100644
> --- a/drivers/scsi/st.c
> +++ b/drivers/scsi/st.c
> @@ -4427,6 +4427,7 @@ static void __exit exit_st(void)
>  	unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
>  				 ST_MAX_TAPE_ENTRIES);
>  	class_unregister(&st_sysfs_class);
> +	idr_destroy(&st_index_idr);
>  	printk(KERN_INFO "st: Unloaded.\n");
>  }
>  
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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