linux-kernel - Re: Linux 3.8-rc1 - another regression on USB :-(

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:	Sat, 12 Jan 2013 12:38:58 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andreas Mohr <andi@...as.de>
cc:	Woody Suwalski <terraluna977@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 3.8-rc1 - another regression on USB :-(

On Sat, 12 Jan 2013, Andreas Mohr wrote:

> There's of course the EHCI vs. UHCI(/OHCI) duality
> (EHCI host controller responsible for high speed transfers,
> the other for 1.1 full speed, both serving the same port connectors).
> So if the coordination between the two is a problem,
> you might end up with merely full speed on a 2.0 port.
> 
> And with drivers builtin vs. module, the init sequence/timing
> might possibly be affected - right?
> Perhaps this got worsened by semi-recent driver init kernel changes?
> (AFAIR the kernel was changed to init more things in parallel,
> for faster bootup). So maybe that affected EHCI vs. UHCI coordination timing.

Another important change is that the EHCI driver is now split into two 
modules.  That can slow down loading and affect the timing.

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/