linux-kernel - Re: [PATCH v9 09/11] PCI, acpiphp: Don't bailout even no slots found yet.

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Date:	Mon, 21 Jan 2013 00:08:54 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v9 09/11] PCI, acpiphp: Don't bailout even no slots found yet.

On Thursday, January 17, 2013 11:53:20 PM Yinghai Lu wrote:
> Could have root bus hot added later and there may be slots that need acpiphp.

The patch implies that acpiphp_get_num_slots() is not necessary any more,
but the changelog above doesn't really explain why that is so.

Do I guess correctly that the bridge the slots are under may not be in
bridge_list yet at the moment and so we don't really know whether or not
we will need acpiphp_glue going forward?

If that's the case:

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

but please say something like this in the changelog:

"The result returned by acpiphp_get_num_slots() is meaningless, because
 the bridge the slots are under may be added after this function has been
 called, so drop acpiphp_get_num_slots() and the code using it."

> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  drivers/pci/hotplug/acpiphp.h      |    1 -
>  drivers/pci/hotplug/acpiphp_core.c |   23 ++---------------------
>  drivers/pci/hotplug/acpiphp_glue.c |   22 ----------------------
>  3 files changed, 2 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
> index a1afb5b..b3ead7a 100644
> --- a/drivers/pci/hotplug/acpiphp.h
> +++ b/drivers/pci/hotplug/acpiphp.h
> @@ -193,7 +193,6 @@ extern void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *slot);
>  /* acpiphp_glue.c */
>  extern int acpiphp_glue_init (void);
>  extern void acpiphp_glue_exit (void);
> -extern int acpiphp_get_num_slots (void);
>  typedef int (*acpiphp_callback)(struct acpiphp_slot *slot, void *data);
>  
>  extern int acpiphp_enable_slot (struct acpiphp_slot *slot);
> diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c
> index 96316b7..c2fd309 100644
> --- a/drivers/pci/hotplug/acpiphp_core.c
> +++ b/drivers/pci/hotplug/acpiphp_core.c
> @@ -50,7 +50,6 @@
>  bool acpiphp_debug;
>  
>  /* local variables */
> -static int num_slots;
>  static struct acpiphp_attention_info *attention_info;
>  
>  #define DRIVER_VERSION	"0.5"
> @@ -272,25 +271,6 @@ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
>  	return 0;
>  }
>  
> -static int __init init_acpi(void)
> -{
> -	int retval;
> -
> -	/* initialize internal data structure etc. */
> -	retval = acpiphp_glue_init();
> -
> -	/* read initial number of slots */
> -	if (!retval) {
> -		num_slots = acpiphp_get_num_slots();
> -		if (num_slots == 0) {
> -			acpiphp_glue_exit();
> -			retval = -ENODEV;
> -		}
> -	}
> -
> -	return retval;
> -}
> -
>  /**
>   * release_slot - free up the memory used by a slot
>   * @hotplug_slot: slot to free
> @@ -379,7 +359,8 @@ static int __init acpiphp_init(void)
>  		return 0;
>  
>  	/* read all the ACPI info from the system */
> -	return init_acpi();
> +	/* initialize internal data structure etc. */
> +	return acpiphp_glue_init();
>  }
>  
>  
> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
> index 45917a5..25d6918 100644
> --- a/drivers/pci/hotplug/acpiphp_glue.c
> +++ b/drivers/pci/hotplug/acpiphp_glue.c
> @@ -1416,28 +1416,6 @@ void  acpiphp_glue_exit(void)
>  	acpi_pci_unregister_driver(&acpi_pci_hp_driver);
>  }
>  
> -
> -/**
> - * acpiphp_get_num_slots - count number of slots in a system
> - */
> -int __init acpiphp_get_num_slots(void)
> -{
> -	struct acpiphp_bridge *bridge;
> -	int num_slots = 0;
> -
> -	list_for_each_entry(bridge, &bridge_list, list) {
> -		dbg("Bus %04x:%02x has %d slot%s\n",
> -				pci_domain_nr(bridge->pci_bus),
> -				bridge->pci_bus->number, bridge->nr_slots,
> -				bridge->nr_slots == 1 ? "" : "s");
> -		num_slots += bridge->nr_slots;
> -	}
> -
> -	dbg("Total %d slots\n", num_slots);
> -	return num_slots;
> -}
> -
> -
>  /**
>   * acpiphp_enable_slot - power on slot
>   * @slot: ACPI PHP slot
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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