[PATCH 2/4] DSS2: Check if display supports update mode changes

ville.syrjala
2010-03-05T13:26:43Z

From: Ville Syrjälä <ville.syrjala@nokia.com>

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>
---
drivers/video/omap2/dss/display.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/video/omap2/dss/display.c b/drivers/video/omap2/dss/display.c
index 6a74ea1..3a8f146 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) {
--
1.6.4.4