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

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Date:	Sun, 13 Apr 2014 21:22:39 +0200
From:	Stefani Seibold <stefani@...bold.net>
To:	linux-usb <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>,
	Alan Stern <stern@...land.harvard.edu>,
	sarah.a.sharp@...ux.intel.com
Subject: Missing USB XHCI and EHCI reset for kexec

When executing a kexec kernel on a PowerPC board the new started kernel
will not find already enumerated USB devices due a missing reset on the
USB bus.

As a work around a

echo 1 >/sys/bus/pci/drivers/[ex]hci-pci/BUS-ADDRESS-OF-THE-HCD/reset

will solve this. But this is far from beauty.

My latest kernel without this issue was for EHCI kernel 2.6.39 and for
XHCI kernel 3.4, but i have no idea when exactly this behavior was
introduced.

For X86 all is fine.

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