linux-kernel - [17/71] drm/i915/lvds: Only act on lid notify when the device is on

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Message-Id: <20110519180555.918072951@clark.kroah.org>
Date:	Thu, 19 May 2011 11:04:45 -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,
	Alex Williamson <alex.williamson@...hat.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Keith Packard <keithp@...thp.com>
Subject: [17/71] drm/i915/lvds: Only act on lid notify when the device is on

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

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

From: Alex Williamson <alex.williamson@...hat.com>

commit 2fb4e61d9471867677c97bf11dba8f1e9dfa7f7c upstream.

If we're using vga switcheroo, the device may be turned off
and poking it can return random state. This provokes an OOPS fixed
separately by 8ff887c847 (drm/i915/dp: Be paranoid in case we disable a
DP before it is attached). Trying to use and respond to events on a
device that has been turned off by the user is in principle a silly thing
to do.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Keith Packard <keithp@...thp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/i915/intel_lvds.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -540,6 +540,9 @@ static int intel_lid_notify(struct notif
 	struct drm_device *dev = dev_priv->dev;
 	struct drm_connector *connector = dev_priv->int_lvds_connector;
 
+	if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
+		return NOTIFY_OK;
+
 	/*
 	 * check and update the status of LVDS connector after receiving
 	 * the LID nofication event.


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