From: Alan Stern <stern@rowland.harvard.edu>
Date: Wed, 10 Oct 2007 20:27:07 +0000 (-0400)
Subject: USB: mutual exclusion for EHCI init and port resets
X-Git-Tag: v2.6.24-rc1~1395^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=32fe01985aa2cb2562f6fc171e526e279abe10db;p=pandora-kernel.git

USB: mutual exclusion for EHCI init and port resets

This patch (as999) fixes a problem that sometimes shows up when host
controller driver modules are loaded in the wrong order.  If ehci-hcd
happens to initialize an EHCI controller while the companion OHCI or
UHCI controller is in the middle of a port reset, the reset can fail
and the companion may get very confused.  The patch adds an
rw-semaphore and uses it to keep EHCI initialization and port resets
mutually exclusive.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <david-b@pacbell.net>
Cc: David Miller <davem@davemloft.net>
Cc: Dely L Sy <dely.l.sy@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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