linux-kernel - Re: [PATCH -next] ACPI: fix missing unlock on error in acpi_memory_remove

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Message-ID: <509B0B7F.3030308@cn.fujitsu.com>
Date:	Thu, 08 Nov 2012 09:31:43 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Wei Yongjun <weiyj.lk@...il.com>
CC:	lenb@...nel.org, rjw@...k.pl, yongjun_wei@...ndmicro.com.cn,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH -next] ACPI: fix missing unlock on error in acpi_memory_remove_memory()

Hi, wei

At 11/07/2012 08:38 PM, Wei Yongjun Wrote:
> From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
> 
> Add the missing mutex_unlock() before return from function
> acpi_memory_remove_memory() in the error handling case.
> 
> Introduce by commit 85fcb3758c10e063a2a30dfad75017097999deed
> 'ACPI / memory-hotplug: introduce a mutex lock to protect the list in acpi_memory_device'
> 
> dpatch engine is used to auto generate this patch.
> (https://github.com/weiyj/dpatch)
> 
> Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

Thanks for your patch.

Dan Carpenter has told me this problem. I fix it, but don't
resend it because it is in test now.

Thanks
Wen Congyang

> ---
>  drivers/acpi/acpi_memhotplug.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index 92c973a..e573e87 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -325,8 +325,10 @@ static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
>  	list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
>  		if (info->enabled) {
>  			result = remove_memory(info->start_addr, info->length);
> -			if (result)
> +			if (result) {
> +				mutex_unlock(&mem_device->list_lock);
>  				return result;
> +			}
>  		}
>  
>  		list_del(&info->list);
> 
> 
> 

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