From: Alan Stern <stern@rowland.harvard.edu>
Date: Tue, 25 Jan 2011 19:50:07 +0000 (+0100)
Subject: PM / Runtime: Don't enable interrupts while running in_interrupt
X-Git-Tag: v2.6.37.1~52
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e3742bc3d042533355fdc13dcec17deb5b584fa;p=pandora-kernel.git

PM / Runtime: Don't enable interrupts while running in_interrupt

commit c3810c88788d505d4ffd786addd111b745e42161 upstream.

This patch (as1445) fixes a bug in the runtime PM core left over from
the addition of the no_callbacks flag.  If this flag is set then it is
possible for rpm_suspend() to be called in_interrupt, so when
releasing spinlocks it's important not to re-enable interrupts.

To avoid an unnecessary save-and-restore of the interrupt flag, the
patch also inlines a pm_request_idle() call.

This fixes Bugzilla #27482.

(The offending code was added in 2.6.37, so it's not necessary to apply
this to any earlier stable kernels.)

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: tim blechmann <tim@klingt.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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