linux-kernel - RE: sharing interrupt between PCI device

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]

Date:	Tue, 11 Nov 2008 16:24:58 +0000
From:	"Altobelli, David" <david.altobelli@...com>
To:	Nobin Mathew <nobin.mathew@...il.com>
CC:	Jiri Slaby <jirislaby@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Robert Hancock <hancockr@...w.ca>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Grant Grundler <grundler@...isc-linux.org>
Subject: RE: sharing interrupt between PCI device


>> On Mon, Nov 10, 2008 at 4:01 PM, Nobin Mathew <nobin.mathew@...il.com> wrote:
>> > Yes USB Virtual Controller has input devices like keyboard and mouse
>> > (routed through hpilo card (remote console)), so those things stops
>> > working when we remove hpilo driver.
>> >

That is not quite correct.  Nothing is routed through hpilo.

The problem is that there is a shared hardware resource in iLO function 2 (hpilo),
and it is used by iLO function 4 (uhci_hcd kdb/mouse).  When hpilo is unloaded,
the pci_device_disable() call removes the ability for this function to act as a
busmaster, which stops the uhci_hcd from functioning correctly.

Reloading hpilo will enable the remote console again.

Removing the pci_disable_device() "fixes" the problem, but doing that worries me.
--
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/