linux-kernel - Re: [PATCH] kernel/smp.c: free related resources when failure occurs in hotplug

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Date:	Tue, 9 Jul 2013 08:28:30 +0800
From:	Wang YanQing <udknight@...il.com>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	lig.fnst@...fujitsu.com, chuansheng.liu@...el.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/smp.c: free related resources when failure occurs
 in hotplug_cfd()

On Mon, Jul 08, 2013 at 04:50:24PM +0800, Chen Gang wrote:
> When failure occurs in hotplug_cfd(), need release related resources,
> or will cause memory leak.
> 
> Also beautify the related code.
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/smp.c |   13 +++++++++----
>  1 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/smp.c b/kernel/smp.c
> index 02a885d..c264623 100644
> --- a/kernel/smp.c
> +++ b/kernel/smp.c
> @@ -45,15 +45,20 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
>  	switch (action) {
>  	case CPU_UP_PREPARE:
>  	case CPU_UP_PREPARE_FROZEN:
> -		if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
> -				cpu_to_node(cpu)))
> +		if (!zalloc_cpumask_var_node(&cfd->cpumask,
> +						GFP_KERNEL, cpu_to_node(cpu)))
>  			return notifier_from_errno(-ENOMEM);

What did you fixed here? code style?
You can drop this part.

> -		if (!zalloc_cpumask_var_node(&cfd->cpumask_ipi, GFP_KERNEL,
> -				cpu_to_node(cpu)))
> +
> +		if (!zalloc_cpumask_var_node(&cfd->cpumask_ipi,
> +						GFP_KERNEL, cpu_to_node(cpu))) {
> +			free_cpumask_var(cfd->cpumask);
>  			return notifier_from_errno(-ENOMEM);
> +		}
> +
>  		cfd->csd = alloc_percpu(struct call_single_data);
>  		if (!cfd->csd) {
>  			free_cpumask_var(cfd->cpumask);
> +			free_cpumask_var(cfd->cpumask_ipi);
>  			return notifier_from_errno(-ENOMEM);
>  		}
>  		break;

Yes, we need this fix.

If you resend the v2, I will give acked-by :)

Thanks.
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