V4L/DVB (5315): Tda1004x: check request firmware for NULL ponter again

In older versions, this was used to decide whether to boot from
eeprom or file. This is no longer necessary but the check helps to avoid
an oops with misconfigured cards.

Signed-off-by: Hartmut Hackmann <hartmut.hackmann@t-online.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/tda1004x.c

@@ -515,18 +515,24 @@ static int tda10046_fwupload(struct dvb_frontend* fe)
 	if (tda1004x_check_upload_ok(state) == 0)
 		return 0;
 
-	/* request the firmware, this will block until someone uploads it */
-	printk(KERN_INFO "tda1004x: waiting for firmware upload...\n");
-	ret = state->config->request_firmware(fe, &fw, TDA10046_DEFAULT_FIRMWARE);
-	if (ret) {
-		/* remain compatible to old bug: try to load with tda10045 image name */
-		ret = state->config->request_firmware(fe, &fw, TDA10045_DEFAULT_FIRMWARE);
+	if (state->config->request_firmware != NULL) {
+		/* request the firmware, this will block until someone uploads it */
+		printk(KERN_INFO "tda1004x: waiting for firmware upload...\n");
+		ret = state->config->request_firmware(fe, &fw, TDA10046_DEFAULT_FIRMWARE);
 		if (ret) {
-			printk(KERN_ERR "tda1004x: no firmware upload (timeout or file not found?)\n");
-			return ret;
-		} else
-			printk(KERN_INFO "tda1004x: please rename the firmware file to %s\n",
-					  TDA10046_DEFAULT_FIRMWARE);
+			/* remain compatible to old bug: try to load with tda10045 image name */
+			ret = state->config->request_firmware(fe, &fw, TDA10045_DEFAULT_FIRMWARE);
+			if (ret) {
+				printk(KERN_ERR "tda1004x: no firmware upload (timeout or file not found?)\n");
+				return ret;
+			} else {
+				printk(KERN_INFO "tda1004x: please rename the firmware file to %s\n",
+						  TDA10046_DEFAULT_FIRMWARE);
+			}
+		}
+	} else {
+		printk(KERN_ERR "tda1004x: no request function defined, can't upload from file\n");
+		return -EIO;
 	}
 	tda1004x_write_mask(state, TDA1004X_CONFC4, 8, 8); // going to boot from HOST
 	ret = tda1004x_do_upload(state, fw->data, fw->size, TDA10046H_CODE_CPT, TDA10046H_CODE_IN);