linux-kernel - Re: Missing USB XHCI and EHCI reset for kexec

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Date:	Tue, 15 Apr 2014 15:14:46 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Stefani Seibold <stefani@...bold.net>
cc:	linux-usb <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	<andreas.brief@...de-schwarz.com>
Subject: Re: Missing USB XHCI and EHCI reset for kexec

On Tue, 15 Apr 2014, Stefani Seibold wrote:

> > > usbcore: registered new interface driver USB-SATA-storage
> > > USB SATA Mass Storage support registered.
> > > usb 1-4: new high-speed USB device number 4 using ehci-pci
> > > xxxx: ports detected
> > 
> > What driver is this?  I've never heard of USB-SATA-storage.
> > 
> 
> This is a special embedded USB SATA driver written by me. It is mostly a
> fork of the usb-storage driver but handle only one vendor and product ID
> and does switch on a port bit. On the other side this vendor and product
> ID is black listed in the regular usb-storage driver. 

Is it possible that your driver leaves the device in a strange state 
where it won't initialize properly?

You can test this by blacklisting both mass-storage drivers.  If the 
device then initializes properly after unbind and rebind, you'll know 
the answer.

Alan Stern

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