From: Ville Syrjälä <ville.syrjala@nokia.com>
Date: Tue, 2 Mar 2010 19:30:52 +0000 (+0200)
Subject: OMAP: DSS2: Check if display supports update mode changes
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=825f50b1a498f6e3532c8fcbc093322bb386f9e1;p=linux-beck.git

OMAP: DSS2: Check if display supports update mode changes

Check whether the display actually has the set_update_mode() function
before calling it. Only the sysfs codepath was broken, the omapfb ioctl
had the necessary protection.

Signed-off-by: Ville Syrjälä <ville.syrjala@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
---

diff --git a/drivers/video/omap2/dss/display.c b/drivers/video/omap2/dss/display.c
index ef8c8529dda2..480aeaa5f39c 100644
--- a/drivers/video/omap2/dss/display.c
+++ b/drivers/video/omap2/dss/display.c
@@ -82,6 +82,9 @@ static ssize_t display_upd_mode_store(struct device *dev,
 	int val, r;
 	enum omap_dss_update_mode mode;
 
+	if (!dssdev->driver->set_update_mode)
+		return -EINVAL;
+
 	val = simple_strtoul(buf, NULL, 10);
 
 	switch (val) {