linux-kernel - Re: [PATCH 4/8] donot allow to eject the memory device if it is being used

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Date:	Tue, 26 Jun 2012 21:21:03 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Wen Congyang <wency@...fujitsu.com>
cc:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yasuaki ISIMATU <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [PATCH 4/8] donot allow to eject the memory device if it is
 being used

On Tue, 26 Jun 2012, Wen Congyang wrote:

> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index a325bb9..2e5d5ab 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -78,6 +78,7 @@ struct acpi_memory_info {
>  	unsigned short caching;	/* memory cache attribute */
>  	unsigned short write_protect;	/* memory read/write attribute */
>  	unsigned int enabled:1;
> +	unsigned int failed:1;
>  };
>  
>  struct acpi_memory_device {
> @@ -251,9 +252,19 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
>  			node = memory_add_physaddr_to_nid(info->start_addr);
>  
>  		result = add_memory(node, info->start_addr, info->length);
> -		if (result)
> +
> +		/*
> +		 * If the memory block has been used by the kernel, add_memory()
> +		 * returns -EEXIST. If add_memory() returns the other error, it
> +		 * means that this memory block is not used by the kernel.
> +		 */
> +		if (result && result != -EEXIST) {
> +			info->failed = 1;
>  			continue;
> -		info->enabled = 1;
> +		}
> +
> +		if (!result)
> +			info->enabled = 1;
>  		num_enabled++;
>  	}
>  	if (!num_enabled) {

num_enabled should only be incremented for result == 0.
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