linux-kernel - [28/90] drm/i915: Fixup for Hold mode

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Message-Id: <20110812210554.608696531@clark.kroah.org>
Date:	Fri, 12 Aug 2011 14:04:13 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Keith Packard <keithp@...thp.com>
Subject: [28/90] drm/i915: Fixup for Hold mode_config->mutex during hotplug

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Keith Packard <keithp@...thp.com>

commit 40ee3381dd1010432acc13e907329029096c5bfc upstream.

drm_helper_hpd_irq_event queues another work proc to go and deliver
the user-space event, and that function also wants to hold the config
mutex, so we shouldn't hold the mutex across the
drm_helper_hpd_irq_event call.

Signed-off-by: Keith Packard <keithp@...thp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/i915/i915_irq.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -313,10 +313,10 @@ static void i915_hotplug_work_func(struc
 		if (encoder->hot_plug)
 			encoder->hot_plug(encoder);
 
+	mutex_unlock(&mode_config->mutex);
+
 	/* Just fire off a uevent and let userspace tell us what to do */
 	drm_helper_hpd_irq_event(dev);
-
-	mutex_unlock(&mode_config->mutex);
 }
 
 static void i915_handle_rps_change(struct drm_device *dev)


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