V4L/DVB (8035): tda18271: dont touch EB14 if rf_cal lookup is out of …

…range

The TDA18271HD/C1 rf_cal map lookup is expected to go out of range outside
of the frequency window 41 MHz - 61.1 MHz.  In these cases, the internal
RF tracking filters calibration mechanism is used.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/common/tuners/tda18271-common.c

@@ -649,9 +649,17 @@ int tda18271_calc_rf_cal(struct dvb_frontend *fe, u32 *freq)
 	u8 val;
 
 	int ret = tda18271_lookup_map(fe, RF_CAL, freq, &val);
+	/* The TDA18271HD/C1 rf_cal map lookup is expected to go out of range
+	 * for frequencies above 61.1 MHz.  In these cases, the internal RF
+	 * tracking filters calibration mechanism is used.
+	 *
+	 * There is no need to warn the user about this.
+	 */
+	if (ret < 0)
+		goto fail;
 
 	regs[R_EB14] = val;
-
+fail:
 	return ret;
 }