linux-kernel - Re: [regression] pciehp hang on hp ia64 rx6600

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Date:	Mon, 17 Mar 2008 13:53:17 -0600
From:	Alex Chiang <achiang@...com>
To:	Mark Lord <mlord@...ox.com>
Cc:	kristen.c.accardi@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [regression] pciehp hang on hp ia64 rx6600

Hi Mark,

* Mark Lord <mlord@...ox.com>:
> Alex Chiang wrote:
>> Hi Mark, Kristin,
>> On my hp ia64 rx6600, 'modprobe pciehp' causes lockups and a
>> system hang on 2.6.25-rc4. My system often hangs when only pciehp
>> is loaded and my console is sitting idle, but I can accelerate
>> the hang 100% of the time by immediately doing a 'modprobe
>> acpiphp' right afterwards.
> ..
>
> Does this patch fix things for you?

Yes, this patch does revert back to previously working 2.6.24
behavior and fixes the problem for me.

Thanks.

> * * *
>
> Invoke pciehp_enable_slot() at startup only when pciehp_force=1.
> Some HP equipment apparently cannot cope with it otherwise.
>
> This restores the (previously working) 2.6.24 behaviour here,
> while allowing machines that need a kick to use pciehp_force=1.
>

Acked-by: Alex Chiang <achiang@...com>

> Signed-off-by: Mark Lord <mlord@...ox.com>
> ---
>
> --- linux-2.6.25-rc5-git2/drivers/pci/hotplug/pciehp_core.c	2008-03-12 
> 13:21:46.000000000 -0400
> +++ linux/drivers/pci/hotplug/pciehp_core.c	2008-03-12 13:23:54.000000000 
> -0400
> @@ -467,7 +467,7 @@
> 	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
> 	t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is 
> occupied */
> -	if (value) {
> +	if (value && pciehp_force) {
> 		rc = pciehp_enable_slot(t_slot);
> 		if (rc)	/* -ENODEV: shouldn't happen, but deal with it */
> 			value = 0;
>
--
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