V4L/DVB: ivtvfb : Module load / unload fixes

Check firmware state when loading module & if firmware is not responding exit
with an error. When module is unloaded, only disable the framebuffer & not all
decoder output.

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/ivtv/ivtvfb.c

@@ -1066,7 +1066,11 @@ static int ivtvfb_init_io(struct ivtv *itv)
 	}
 	mutex_unlock(&itv->serialize_lock);
 
-	ivtvfb_get_framebuffer(itv, &oi->video_rbase, &oi->video_buffer_size);
+	if (ivtvfb_get_framebuffer(itv, &oi->video_rbase,
+					&oi->video_buffer_size) < 0) {
+		IVTVFB_ERR("Firmware failed to respond\n");
+		return -EIO;
+	}
 
 	/* The osd buffer size depends on the number of video buffers allocated
 	   on the PVR350 itself. For now we'll hardcode the smallest osd buffer
@@ -1158,8 +1162,11 @@ static int ivtvfb_init_card(struct ivtv *itv)
 	}
 
 	/* Find & setup the OSD buffer */
-	if ((rc = ivtvfb_init_io(itv)))
+	rc = ivtvfb_init_io(itv);
+	if (rc) {
+		ivtvfb_release_buffers(itv);
 		return rc;
+	}
 
 	/* Set the startup video mode information */
 	if ((rc = ivtvfb_init_vidmode(itv))) {
@@ -1210,6 +1217,7 @@ static int ivtvfb_callback_cleanup(struct device *dev, void *p)
 {
 	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 	struct ivtv *itv = container_of(v4l2_dev, struct ivtv, v4l2_dev);
+	struct osd_info *oi = itv->osd_info;
 
 	if (itv && (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT)) {
 		if (unregister_framebuffer(&itv->osd_info->ivtvfb_info)) {
@@ -1218,7 +1226,7 @@ static int ivtvfb_callback_cleanup(struct device *dev, void *p)
 			return 0;
 		}
 		IVTVFB_INFO("Unregister framebuffer %d\n", itv->instance);
-		ivtvfb_blank(FB_BLANK_POWERDOWN, &itv->osd_info->ivtvfb_info);
+		ivtvfb_blank(FB_BLANK_VSYNC_SUSPEND, &oi->ivtvfb_info);
 		ivtvfb_release_buffers(itv);
 		itv->osd_video_pbase = 0;
 	}