From: Alan Stern <stern@rowland.harvard.edu>
Date: Wed, 11 Jul 2012 15:23:10 +0000 (-0400)
Subject: USB: EHCI: fix up locking
X-Git-Tag: v3.6-rc1~101^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c4f3476436f7452b97c8accb5dd7d53219a11a3f;p=pandora-kernel.git

USB: EHCI: fix up locking

This patch (as1588) adjusts the locking in ehci-hcd's various halt,
shutdown, and suspend/resume pathways.  We want to hold the spinlock
while writing device registers and accessing shared variables, but not
while polling in a loop.

In addition, there's no need to call ehci_work() at times when no URBs
can be active, i.e., in ehci_stop() and ehci_bus_suspend().

Finally, ehci_adjust_port_wakeup_flags() is called only in situations
where interrupts are enabled; therefore it can use spin_lock_irq
rather than spin_lock_irqsave.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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