lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20071016154142.a46905f2.kristen.c.accardi@intel.com>
Date:	Tue, 16 Oct 2007 15:41:42 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Greg KH <greg@...ah.com>
Cc:	Mark Lord <lkml@....ca>, Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	pcihpd-discuss@...ts.sourceforge.net
Subject: Re: [Pcihpd-discuss] [PATCH] Fix PCIe hotplug for Dell notebook
 ExpressCard slots

On Tue, 16 Oct 2007 15:03:54 -0700
Greg KH <greg@...ah.com> wrote:

> On Tue, Oct 16, 2007 at 05:57:03PM -0400, Mark Lord wrote:
> > Fix PCIe Hotplug so that it works with ExpressCard slots on Dell notebooks
> > in conjunction with modparam of pciehp_force=1.
> >
> > The PCIe Hotplug driver has two shortcomings when used on Dell notebooks
> > which lack ACPI BIOS support for PCIe hotplug:
> 
> Wait, Dell explicitly says that pci hotplug of express cards is not
> supported and is broken on these laptops.  This is because the version
> of Windows they support on these machines also does not support
> hotplugging these devices.

Just to add to why sometimes vendors disable PCIe hotplug by not providing
_OSC - sometimes there are problems with the hardware itself, and so
due to schedule and other reasons, vendors will decide to just disable
the support by not providing OSC, since really according to spec we shouldn't
be running the PCIe hot plug driver if OSC doesn't exist or fails.  This
can be anything from "Well, we don't have time to test it" to actual hardware
errata.  At any rate, we don't know the reasons.  I think when we force these
things, you run the danger that things will break on you in some strange
ways.

Just out of curiosity, did you try using ACPI based hotplug for this 
laptop?  Sometimes vendors will let you do that because then they can include
hardware workarounds in the AML.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ