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

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Message-ID: <1402175478.3247.299.camel@pasglop>
Date:	Sun, 08 Jun 2014 07:11:18 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>,
	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>,
	Mathias Nyman <mathias.nyman@...el.com>
Subject: Re: Missing USB XHCI and EHCI reset for kexec

On Sat, 2014-06-07 at 11:40 -0400, Alan Stern wrote:
> The current xhci-hcd driver includes a quirk flag (XHCI_SPURIOS_WAKEUP) 
> that causes the shutdown routine to reset the controller.  It wasn't 
> meant for fixing kexec problems, but I bet you could use it for that 
> purpose.
> 
> In addition, it's possible that a reset is needed in the probe pathway.

Ok, thanks. I'll have a look. A reset in the probe means fixing distros,
I'd rather find a way to fix it from the kexec path entirely, even if
that involves adding a quirk on the way out to reset it in shutdown()

I'll see what I can come up with that works and will come back to you.

Cheers,
Ben.


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