From: Stanislaw Gruszka <sgruszka@redhat.com>
Date: Wed, 19 Feb 2014 09:29:01 +0000 (+0100)
Subject: usb: ehci: fix deadlock when threadirqs option is used
X-Git-Tag: v3.2.56~55
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0986dc71fb09d9916d5579c8c5e2f2c8099337d0;p=pandora-kernel.git

usb: ehci: fix deadlock when threadirqs option is used

commit a1227f3c1030e96ebc51d677d2f636268845c5fb upstream.

ehci_irq() and ehci_hrtimer_func() can deadlock on ehci->lock when
threadirqs option is used. To prevent the deadlock use
spin_lock_irqsave() in ehci_irq().

This change can be reverted when hrtimer callbacks become threaded.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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