linux-kernel - Re: PCIe Hotplug: NFG unless I boot with card already inserted.

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Message-ID: <471521DC.5030007@rtr.ca>
Date:	Tue, 16 Oct 2007 16:41:00 -0400
From:	Mark Lord <lkml@....ca>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc:	pcihpd-discuss@...ts.sourceforge.net,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: PCIe Hotplug:  NFG unless I boot with card already inserted.

Kristen Carlson Accardi wrote:
> On Tue, 16 Oct 2007 14:39:33 -0400
> Mark Lord <lkml@....ca> wrote:
> 
>> Another thing:  if a card is already in the slot before pciehp is loaded
>> (under any circumstances), then pciehp does *not* see the card until I
>> unplug/replug it.


You mean that the existing code does not handle it properly.
The hardware can see the card just fine, as reflected in the slot
status bits.

> One other thing to note here, the proper operation of hot plug dictates that
> if you boot your laptop with no adapter in the slot, you must first load
> the driver in order for the new adapter interrupt to be captured.  So,
> if you insert a card without the driver loaded, it will not be enumerated
> by PCI until you remove it and the reinsert it.

Bull puckey.

If there's already a card in the slot when we turn on the power,
the Linux kernel should find and use that card.

This is flawed, and needs fixing.

Cheers
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