linux-kernel - [ 64/91] gma500: Fix Poulsbo suspend/resume crash on devices with SDVO ports

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Date:	Sun, 27 May 2012 09:26:10 +0900
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,
	Guillaume Clément <guillaume@...bob.org>,
	Alan Cox <alan@...ux.intel.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [ 64/91] gma500: Fix Poulsbo suspend/resume crash on devices with SDVO ports

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

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

From: Alan Cox <alan@...ux.intel.com>

commit 7beff62ee39d3ccf088bb77f61a63037f714d235 upstream.

Reported-by: Guillaume Clément <guillaume@...bob.org>
Signed-off-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/gma500/psb_device.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/gma500/psb_device.c
+++ b/drivers/gpu/drm/gma500/psb_device.c
@@ -197,7 +197,8 @@ static int psb_save_display_registers(st
 	}
 
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
-		connector->funcs->save(connector);
+		if (connector->funcs->save)
+			connector->funcs->save(connector);
 
 	mutex_unlock(&dev->mode_config.mutex);
 	return 0;
@@ -235,7 +236,8 @@ static int psb_restore_display_registers
 			crtc->funcs->restore(crtc);
 
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
-		connector->funcs->restore(connector);
+		if (connector->funcs->restore)
+			connector->funcs->restore(connector);
 
 	mutex_unlock(&dev->mode_config.mutex);
 	return 0;


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