linux-kernel - Re: PCIe Hotplugging not working

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Message-ID: <20111209222520.GA24786@kroah.com>
Date:	Fri, 9 Dec 2011 14:25:20 -0800
From:	Greg KH <greg@...ah.com>
To:	Anand Kanaginhal <anand_dk@...mail.com>
Cc:	mjg59@...f.ucam.org, bhelgaas@...gle.com,
	Linux PCI mailing <linux-pci@...r.kernel.org>,
	linux kernel mailing <linux-kernel@...r.kernel.org>,
	linux hotplug mailing <linux-hotplug@...r.kernel.org>
Subject: Re: PCIe Hotplugging not working

On Fri, Dec 09, 2011 at 01:17:53PM -0800, Anand Kanaginhal wrote:
> 
> 
> > Date: Fri, 9 Dec 2011 10:07:08 -0800
> > From: greg@...ah.com
> > To: anand_dk@...mail.com
> > CC: mjg59@...f.ucam.org; bhelgaas@...gle.com; linux-pci@...r.kernel.org;
> linux-kernel@...r.kernel.org; linux-hotplug@...r.kernel.org
> > Subject: Re: PCIe Hotplugging not working
> >
> > On Fri, Dec 09, 2011 at 09:19:39AM -0800, Anand Kanaginhal wrote:
> > > 1. With the above setup, If I hotplug card c1 and/or c2, will my driver
> probe
> > > get invoked.
> >
> > Stop right here. Please get your pci hotplug controller driver working
> > first, for your platform. That seems to be the problem. After that,
> > the rest of your questions should just resolve themselves.
> Thank you Greg for your assistance, perhaps it would be little more helpful, if
> you could tell me the basis on which you drew the conclusion. I am no kernel
> expert :( 

As your driver's callbacks aren't being called, that's probably why this
isn't working.

Please make sure your pci hotplug driver is working first.  Try turning
on and off the power to the card slot (in the sysfs directory for the
slot) and see if that's working.

You also have failed to say exactly what pci hotplug controller you have
in your system, what is it?  You have to have one, and the driver loaded
for it, for any of this to work at all.

greg k-h
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