linux-kernel - Re: [PATCH] PCI: Remove not needed check in disable aspm link

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAErSpo4ncW8rkcpDiccORZedj30m7jRmpXK+amfDGn_wjwt7EA@mail.gmail.com>
Date:	Thu, 28 Mar 2013 06:46:39 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	stable@...nel.org
Subject: Re: [PATCH] PCI: Remove not needed check in disable aspm link

On Thu, Mar 28, 2013 at 1:41 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Wed, Mar 27, 2013 at 3:56 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>>
>> Why can't we set all the ASPM flags *first*, before calling
>> pci_acpi_scan_root()?  That way we could just do the correct ASPM
>> setup as we discover devices during enumeration, rather than trying to
>> fix things up afterwards.  I suspect pcie_clear_aspm() is broken
>> anyway, because it looks like it only touches one level of the
>> hierarchy, without recursively descending it.
>
> Yes, we can clean up aspm stop/clear up.
> and that should be for 3.10 right?
>
> But this patch should be safe for 3.9 and stable.

This patch might be *safe*, but it (and the changelog) are completely
unintelligible.

The problem with applying an unintelligible stop-gap patch is that it
becomes forever part of the changelog, and it's a huge waste of time
to everybody who tries to understand the history later.  That's why I
think it's worth spending some time to make a good patch now.

Bjorn
--
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/