linux-kernel - Re: Oops in UHCI when encountering "host controller process error"

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: <Pine.LNX.4.44L0.0812101006540.2175-100000@iolanthe.rowland.org>
Date:	Wed, 10 Dec 2008 10:10:19 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	Ian Jackson <Ian.Jackson@...citrix.com>
Subject: Re: Oops in UHCI when encountering "host controller process error"

On Tue, 9 Dec 2008, Jeremy Fitzhardinge wrote:

> OK.  If the controller is idle and the kernel wants to submit it some 
> new work, where does that happen?  Can I stick a uhci_sprint_schedule() 
> there to see the state of the structures before it starts to work on them?

The entry point is uhci_urb_enqueue().  You can do whatever you like 
there, but bear in mind that it may be called in interrupt context.  
uhci_sprint_schedule() should be fine.

However I don't really see the point.  If the DMA pool allocations are 
so badly messed up that the initial setup is wrong, why bother to 
search any further?

Alan Stern

--
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/