linux-kernel - [ 72/75] drm/i915: Hold mode_config lock whilst changing mode for lastclose()

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Date:	Thu, 19 Apr 2012 14:04:15 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Oleksij Rempel <bug-track@...her-privat.net>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [ 72/75] drm/i915: Hold mode_config lock whilst changing mode for lastclose()

3.3-stable review patch.  If anyone has any objections, please let me know.

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

From: Chris Wilson <chris@...is-wilson.co.uk>

commit c291be9dba370ba696a0d482249a212cf5c15f45 upstream.

Upon lastclose(), we switch back to the fbcon configuration. This
requires taking the mode_config lock in order to serialise the change
with output probing elsewhere.

Reported-by: Oleksij Rempel <bug-track@...her-privat.net>
References: https://bugs.freedesktop.org/show_bug.cgi?id=48652
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Acked-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/gpu/drm/i915/intel_fb.c
+++ b/drivers/gpu/drm/i915/intel_fb.c
@@ -283,6 +283,8 @@ void intel_fb_restore_mode(struct drm_de
 	struct drm_mode_config *config = &dev->mode_config;
 	struct drm_plane *plane;
 
+	mutex_lock(&dev->mode_config.mutex);
+
 	ret = drm_fb_helper_restore_fbdev_mode(&dev_priv->fbdev->helper);
 	if (ret)
 		DRM_DEBUG("failed to restore crtc mode\n");
@@ -290,4 +292,6 @@ void intel_fb_restore_mode(struct drm_de
 	/* Be sure to shut off any planes that may be active */
 	list_for_each_entry(plane, &config->plane_list, head)
 		plane->funcs->disable_plane(plane);
+
+	mutex_unlock(&dev->mode_config.mutex);
 }


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