linux-kernel - Re: [PATCH 1/2] pinctrl: free allocated pinctrl_map structure only once and use kernel facilities for IMX_PMX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120607120532.GD8354@shlinux2.ap.freescale.net>
Date:	Thu, 7 Jun 2012 20:05:33 +0800
From:	Dong Aisheng <aisheng.dong@...escale.com>
To:	Devendra Naga <devendra.aaru@...il.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinctrl: free allocated pinctrl_map structure only
 once and use kernel facilities for IMX_PMX_DUMP

On Sat, Jun 02, 2012 at 10:33:53PM +0530, Devendra Naga wrote:
> a) as we allocate the pinctrl_map structure at imx_dt_node_to_map at  line 167, anyway
> if its an element, or a num_elements * (sizeof(type)) elements allocated to one single
> pointer must be freed only once.
> 
> CASE. A)
> 
> as new_map is not moved and allocated like,
> 
> for (i = 0; i < MAX_ELEMS; i++) {
> 	new_map[i] = kmalloc(numelems * size, GFP_KERNEL);
> }
> 
> its freed as
> 
> for (i = 0; i < MAX_ELEMS; i++) {
> 	kfree(new_map[i]);
> }
> 
> CASE. B)
> and its allocated like
> 	new_map = kmalloc(numelems * size, GFP_KERNEL);
> 
> it just needs kfree not as case A's.
> 
> b) use KERN_DEBUG facility for the IMX_PMX_DUMP macro.
> 
> Signed-off-by: Devendra Naga <devendra.aaru@...il.com>
> ---
>  drivers/pinctrl/pinctrl-imx.c |   23 +++++++++++------------
>  1 file changed, 11 insertions(+), 12 deletions(-)
>
Sorry for late reply.
I missed this patch series.
You can CC me next time. :)

> diff --git a/drivers/pinctrl/pinctrl-imx.c b/drivers/pinctrl/pinctrl-imx.c
> index f6e7c67..553ed95 100644
> --- a/drivers/pinctrl/pinctrl-imx.c
> +++ b/drivers/pinctrl/pinctrl-imx.c
> @@ -27,16 +27,16 @@
>  #include "core.h"
>  #include "pinctrl-imx.h"
>  
> -#define IMX_PMX_DUMP(info, p, m, c, n)		\
> -{						\
> -	int i, j;				\
> -	printk("Format: Pin Mux Config\n");	\
> -	for (i = 0; i < n; i++) {		\
> -		j = p[i];			\
> -		printk("%s %d 0x%lx\n",		\
> -			info->pins[j].name,	\
> -			m[i], c[i]);		\
> -	}					\
> +#define IMX_PMX_DUMP(info, p, m, c, n)			\
> +{							\
> +	int i, j;					\
> +	printk(KERN_DEBUG "Format: Pin Mux Config\n");	\
> +	for (i = 0; i < n; i++) {			\
> +		j = p[i];				\
> +		printk(KERN_DEBUG "%s %d 0x%lx\n",	\
> +			info->pins[j].name,		\
> +			m[i], c[i]);			\
> +	}						\
I can't remember clearly but i encountered a strange issue before
that the format was not what i want with KERN_DEBUG...
But i just tried your patch and it did not appear.
So i'm ok with this change.

>  }
>  
>  /* The bits in CONFIG cell defined in binding doc*/
> @@ -203,8 +203,7 @@ static void imx_dt_free_map(struct pinctrl_dev *pctldev,
>  {
>  	int i;
Also need removed?

>  
> -	for (i = 0; i < num_maps; i++)
> -		kfree(map);
> +	kfree(map);

BTW, it would be better if the change the patch title to:
"pinctrl: pinctrl-imx: ...."

Otherwise,
Acked-by: Dong Aisheng <dong.aisheng@...aro.org>

Regards
Dong Aisheng

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/