OMAP: DSS2: check lock_fb_info() return value

Give up if lock_fb_info() fails, following the same convention as other
lock_fb_info() users.
Signed-off-by: Jani Nikula <ext-jani.1.nikula@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

drivers/video/omap2/omapfb/omapfb-ioctl.c

@@ -183,7 +183,8 @@ int omapfb_update_window(struct fb_info *fbi,
 	struct omapfb2_device *fbdev = ofbi->fbdev;
 	int r;
 
-	lock_fb_info(fbi);
+	if (!lock_fb_info(fbi))
+		return -ENODEV;
 	omapfb_lock(fbdev);
 
 	r = omapfb_update_window_nolock(fbi, x, y, w, h);

drivers/video/omap2/omapfb/omapfb-sysfs.c

@@ -57,7 +57,8 @@ static ssize_t store_rotate_type(struct device *dev,
 	if (rot_type != OMAP_DSS_ROT_DMA && rot_type != OMAP_DSS_ROT_VRFB)
 		return -EINVAL;
 
-	lock_fb_info(fbi);
+	if (!lock_fb_info(fbi))
+		return -ENODEV;
 
 	r = 0;
 	if (rot_type == ofbi->rotation_type)
@@ -105,7 +106,8 @@ static ssize_t store_mirror(struct device *dev,
 	if (mirror != 0 && mirror != 1)
 		return -EINVAL;
 
-	lock_fb_info(fbi);
+	if (!lock_fb_info(fbi))
+		return -ENODEV;
 
 	ofbi->mirror = mirror;
 
@@ -137,7 +139,8 @@ static ssize_t show_overlays(struct device *dev,
 	ssize_t l = 0;
 	int t;
 
-	lock_fb_info(fbi);
+	if (!lock_fb_info(fbi))
+		return -ENODEV;
 	omapfb_lock(fbdev);
 
 	for (t = 0; t < ofbi->num_overlays; t++) {
@@ -195,7 +198,8 @@ static ssize_t store_overlays(struct device *dev, struct device_attribute *attr,
 	if (buf[len - 1] == '\n')
 		len = len - 1;
 
-	lock_fb_info(fbi);
+	if (!lock_fb_info(fbi))
+		return -ENODEV;
 	omapfb_lock(fbdev);
 
 	if (len > 0) {
@@ -317,7 +321,8 @@ static ssize_t show_overlays_rotate(struct device *dev,
 	ssize_t l = 0;
 	int t;
 
-	lock_fb_info(fbi);
+	if (!lock_fb_info(fbi))
+		return -ENODEV;
 
 	for (t = 0; t < ofbi->num_overlays; t++) {
 		l += snprintf(buf + l, PAGE_SIZE - l, "%s%d",
@@ -345,7 +350,8 @@ static ssize_t store_overlays_rotate(struct device *dev,
 	if (buf[len - 1] == '\n')
 		len = len - 1;
 
-	lock_fb_info(fbi);
+	if (!lock_fb_info(fbi))
+		return -ENODEV;
 
 	if (len > 0) {
 		char *p = (char *)buf;
@@ -416,7 +422,8 @@ static ssize_t store_size(struct device *dev, struct device_attribute *attr,
 
 	size = PAGE_ALIGN(simple_strtoul(buf, NULL, 0));
 
-	lock_fb_info(fbi);
+	if (!lock_fb_info(fbi))
+		return -ENODEV;
 
 	for (i = 0; i < ofbi->num_overlays; i++) {
 		if (ofbi->overlays[i]->info.enabled) {