[media] dvb core: remove support for post FE legacy ioctl intercept

This DVB_FE_IOCTL_POST isn't used, so remove it.

Also, intercepting ioctl's like that only works with legacy ioctl's,
due to the way it was implemented. so this design is broken.
Document it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-core/dvb_frontend.c

@@ -2287,13 +2287,6 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
 		break;
 	};
 
-	if (fe->dvb->fe_ioctl_override) {
-		cb_err = fe->dvb->fe_ioctl_override(fe, cmd, parg,
-						    DVB_FE_IOCTL_POST);
-		if (cb_err < 0)
-			return cb_err;
-	}
-
 	return err;
 }
 

drivers/media/dvb/dvb-core/dvbdev.h

@@ -76,7 +76,6 @@ struct dvb_adapter {
 	 * after the core handles an ioctl:
 	 *
 	 * DVB_FE_IOCTL_PRE indicates that the ioctl has not yet been handled.
-	 * DVB_FE_IOCTL_POST indicates that the ioctl has been handled.
 	 *
 	 * When DVB_FE_IOCTL_PRE is passed to the callback as the stage arg:
 	 *
@@ -86,14 +85,10 @@ struct dvb_adapter {
 	 * return a negative int to prevent dvb-core from handling the ioctl,
 	 * 	and return that value as an error.
 	 *
-	 * When DVB_FE_IOCTL_POST is passed to the callback as the stage arg:
-	 *
-	 * return 0 to allow the dvb_frontend ioctl handler to exit normally.
-	 * return a negative int to cause the dvb_frontend ioctl handler to
-	 * 	return that value as an error.
+	 * WARNING: Don't use it on newer drivers: this only affects DVBv3
+	 * calls, and should be removed soon.
 	 */
 #define DVB_FE_IOCTL_PRE 0
-#define DVB_FE_IOCTL_POST 1
 	int (*fe_ioctl_override)(struct dvb_frontend *fe,
 				 unsigned int cmd, void *parg,
 				 unsigned int stage);

drivers/media/dvb/dvb-usb-v2/mxl111sf.c

@@ -898,10 +898,6 @@ static int mxl111sf_fe_ioctl_override(struct dvb_frontend *fe,
 			break;
 		}
 		break;
-
-	case DVB_FE_IOCTL_POST:
-		/* no post-ioctl handling required */
-		break;
 	}
 	return err;
 };