linux-kernel - Re: [Patch v5 4/7] acpi_memhotplug.c: free memory device if acpi_memory_enable

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Message-ID: <50A4B337.6070109@jp.fujitsu.com>
Date:	Thu, 15 Nov 2012 18:17:43 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Wen Congyang <wency@...fujitsu.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-acpi@...r.kernel.org>, Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Toshi Kani <toshi.kani@...com>, Jiang Liu <liuj97@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [Patch v5 4/7] acpi_memhotplug.c: free memory device if acpi_memory_enable_device()
 failed

2012/11/15 15:59, Wen Congyang wrote:
> If acpi_memory_enable_device() fails, acpi_memory_enable_device() will
> return a non-zero value, which means we fail to bind the memory device to
> this driver.  So we should free memory device before
> acpi_memory_device_add() returns.
> 
> CC: David Rientjes <rientjes@...gle.com>
> CC: Jiang Liu <liuj97@...il.com>
> CC: Len Brown <len.brown@...el.com>
> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> CC: Paul Mackerras <paulus@...ba.org>
> CC: Christoph Lameter <cl@...ux.com>
> Cc: Minchan Kim <minchan.kim@...il.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> CC: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> CC: Rafael J. Wysocki <rjw@...k.pl>
> CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Signed-off-by: Wen Congyang <wency@...fujitsu.com>
> ---

Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

Thanks,
Yasuaki Ishimatsu

>   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 c5e7b6d..e52ad5d 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -421,9 +421,11 @@ static int acpi_memory_device_add(struct acpi_device *device)
>   	if (!acpi_memory_check_device(mem_device)) {
>   		/* call add_memory func */
>   		result = acpi_memory_enable_device(mem_device);
> -		if (result)
> +		if (result) {
>   			printk(KERN_ERR PREFIX
>   				"Error in acpi_memory_enable_device\n");
> +			acpi_memory_device_free(mem_device);
> +		}
>   	}
>   	return result;
>   }
> 


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