linux-kernel - Re: [PATCH] ACPI: ibm-acpi: allow module to load when acpi notifiers can't be set

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Date:	Thu, 15 Mar 2007 12:26:54 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Chris Wedgwood <cw@...f.org>,
	ibm-acpi-devel@...ts.sourceforge.net
Subject: Re: [PATCH] ACPI: ibm-acpi: allow module to load when acpi
 notifiers can't be set

On Thu, 15 Mar 2007 14:51:14 -0300
Henrique de Moraes Holschuh <hmh@....eng.br> wrote:

> This patch allows for ibm-acpi to coexist (with diminished functionality) with
> other drivers like ACPI_BAY.  ibm-acpi will simply disable the functions it is
> not able to register ACPI notifiers for.


this patch gives me the following compile error:

drivers/acpi/ibm_acpi.c: In function ‘ibm_init’:
drivers/acpi/ibm_acpi.c:2605: warning: implicit declaration of function ‘ibm_exit’
drivers/acpi/ibm_acpi.c: At top level:
drivers/acpi/ibm_acpi.c:2616: warning: conflicting types for ‘ibm_exit’
drivers/acpi/ibm_acpi.c:2616: error: static declaration of ‘ibm_exit’ follows non-static declaration
drivers/acpi/ibm_acpi.c:2605: error: previous implicit declaration of ‘ibm_exit’ was here



> 
> Signed-off-by: Henrique de Moraes Holschuh <hmh@....eng.br>
> Cc: Chris Wedgwood <cw@...f.org>
> Cc: Kristen Carlson Accardi <kristen.c.accardi@...el.com>
> ---
> 
>  Len, you can pull this patch from:
>  git://repo.or.cz/linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git
>  branch for-upstream/acpi-release
> 
>  Please send it to Linus for merge in 2.6.21.
> 
>  It will clash with the patches in acpi-test that are waiting for 2.6.22.
>  I will rediff those, and send you a pull request when this patch
>  gets accepted in mainline.
> 
>  drivers/acpi/ibm_acpi.c |   17 ++++++++++++++---
>  1 files changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/acpi/ibm_acpi.c b/drivers/acpi/ibm_acpi.c
> index 3690136..f9f36f9 100644
> --- a/drivers/acpi/ibm_acpi.c
> +++ b/drivers/acpi/ibm_acpi.c
> @@ -2507,7 +2507,7 @@ static int __init setup_notify(struct ibm_struct *ibm)
>  	ret = acpi_bus_get_device(*ibm->handle, &ibm->device);
>  	if (ret < 0) {
>  		printk(IBM_ERR "%s device not present\n", ibm->name);
> -		return 0;
> +		return -ENODEV;
>  	}
>  
>  	acpi_driver_data(ibm->device) = ibm;
> @@ -2516,8 +2516,13 @@ static int __init setup_notify(struct ibm_struct *ibm)
>  	status = acpi_install_notify_handler(*ibm->handle, ibm->type,
>  					     dispatch_notify, ibm);
>  	if (ACPI_FAILURE(status)) {
> -		printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
> -		       ibm->name, status);
> +		if (status == AE_ALREADY_EXISTS) {
> +			printk(IBM_NOTICE "another device driver is already handling %s events\n",
> +				ibm->name);
> +		} else {
> +			printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
> +				ibm->name, status);
> +		}
>  		return -ENODEV;
>  	}
>  	ibm->notify_installed = 1;
> @@ -2594,6 +2599,12 @@ static int __init ibm_init(struct ibm_struct *ibm)
>  
>  	if (ibm->notify) {
>  		ret = setup_notify(ibm);
> +		if (ret == -ENODEV) {
> +			printk(IBM_NOTICE "disabling subdriver %s\n",
> +				ibm->name);
> +			ibm_exit(ibm);
> +			return 0;
> +		}
>  		if (ret < 0)
>  			return ret;
>  	}
> -- 
> 1.5.0.3
> 
> 
> -- 
>   "One disk to rule them all, One disk to find them. One disk to bring
>   them all and in the darkness grind them. In the Land of Redmond
>   where the shadows lie." -- The Silicon Valley Tarot
>   Henrique Holschuh
> 
-
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