linux-kernel - Re: [PATCH] PNPACPI: proper handling ACPI IO/Memory resources

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Message-ID: <3883740.St1mC7IYnm@vostro.rjw.lan>
Date:	Wed, 12 Mar 2014 00:38:39 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	rafael.j.wysocki@...el.com, jwollrath@....de,
	markus@...ppelsdorf.de, pebolle@...cali.nl
Subject: Re: [PATCH] PNPACPI: proper handling ACPI IO/Memory resources

On Tuesday, March 11, 2014 10:40:27 PM Zhang Rui wrote:
> Before commit b355cee88e3b1a193f0e9a81db810f6f83ad728b,
> if acpi_dev_resource_memory()/acpi_dev_resource_io() returns false,
> it means the the resource is not a memeory/IO resource.
> 
> But after commit b355cee88e3b1a193f0e9a81db810f6f83ad728b,
> if the memory/IO resource is invalid (the length of the resource is zero),
> acpi_dev_resource_memory()/acpi_dev_resource_io() returns false as well.
> 
> This breaks pnpacpi_allocated_resource(), because the current code would
> recognize the invalid memory/io resource as unknown resource type.
> Thus users will get warning messages on machines with zero length
> ACPI memeory/IO resources.
> 
> This patch fixes the problem by invoking acpi_dev_resource_memory()/
> acpi_dev_resource_io() for ACPI memory/IO resources only.
> 
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>

Applied, thanks Rui!

> ---
>  drivers/pnp/pnpacpi/rsparser.c |   15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
> index 167f3d0..66977eb 100644
> --- a/drivers/pnp/pnpacpi/rsparser.c
> +++ b/drivers/pnp/pnpacpi/rsparser.c
> @@ -183,9 +183,7 @@ static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
>  	struct resource r = {0};
>  	int i, flags;
>  
> -	if (acpi_dev_resource_memory(res, &r)
> -	    || acpi_dev_resource_io(res, &r)
> -	    || acpi_dev_resource_address_space(res, &r)
> +	if (acpi_dev_resource_address_space(res, &r)
>  	    || acpi_dev_resource_ext_address_space(res, &r)) {
>  		pnp_add_resource(dev, &r);
>  		return AE_OK;
> @@ -217,6 +215,17 @@ static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
>  	}
>  
>  	switch (res->type) {
> +	case ACPI_RESOURCE_TYPE_MEMORY24:
> +	case ACPI_RESOURCE_TYPE_MEMORY32:
> +	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
> +		if (acpi_dev_resource_memory(res, &r))
> +			pnp_add_resource(dev, &r);
> +		break;
> +	case ACPI_RESOURCE_TYPE_IO:
> +	case ACPI_RESOURCE_TYPE_FIXED_IO:
> +		if (acpi_dev_resource_io(res, &r))
> +			pnp_add_resource(dev, &r);
> +		break;
>  	case ACPI_RESOURCE_TYPE_DMA:
>  		dma = &res->data.dma;
>  		if (dma->channel_count > 0 && dma->channels[0] != (u8) -1)
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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