--- zzzz-none-000/linux-3.10.107/drivers/media/radio/radio-cadet.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/media/radio/radio-cadet.c	2021-02-04 17:41:59.000000000 +0000
@@ -270,6 +270,16 @@
 	outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
 }
 
+static bool cadet_has_rds_data(struct cadet *dev)
+{
+	bool result;
+
+	mutex_lock(&dev->lock);
+	result = dev->rdsin != dev->rdsout;
+	mutex_unlock(&dev->lock);
+	return result;
+}
+
 
 static void cadet_handler(unsigned long data)
 {
@@ -279,13 +289,12 @@
 	if (mutex_trylock(&dev->lock)) {
 		outb(0x3, dev->io);       /* Select RDS Decoder Control */
 		if ((inb(dev->io + 1) & 0x20) != 0)
-			printk(KERN_CRIT "cadet: RDS fifo overflow\n");
+			pr_err("cadet: RDS fifo overflow\n");
 		outb(0x80, dev->io);      /* Select RDS fifo */
+
 		while ((inb(dev->io) & 0x80) != 0) {
 			dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
-			if (dev->rdsin + 1 == dev->rdsout)
-				printk(KERN_WARNING "cadet: RDS buffer overflow\n");
-			else
+			if (dev->rdsin + 1 != dev->rdsout)
 				dev->rdsin++;
 		}
 		mutex_unlock(&dev->lock);
@@ -294,7 +303,7 @@
 	/*
 	 * Service pending read
 	 */
-	if (dev->rdsin != dev->rdsout)
+	if (cadet_has_rds_data(dev))
 		wake_up_interruptible(&dev->read_queue);
 
 	/*
@@ -327,22 +336,21 @@
 	mutex_lock(&dev->lock);
 	if (dev->rdsstat == 0)
 		cadet_start_rds(dev);
-	if (dev->rdsin == dev->rdsout) {
-		if (file->f_flags & O_NONBLOCK) {
-			i = -EWOULDBLOCK;
-			goto unlock;
-		}
-		mutex_unlock(&dev->lock);
-		interruptible_sleep_on(&dev->read_queue);
-		mutex_lock(&dev->lock);
-	}
+	mutex_unlock(&dev->lock);
+
+	if (!cadet_has_rds_data(dev) && (file->f_flags & O_NONBLOCK))
+		return -EWOULDBLOCK;
+	i = wait_event_interruptible(dev->read_queue, cadet_has_rds_data(dev));
+	if (i)
+		return i;
+
+	mutex_lock(&dev->lock);
 	while (i < count && dev->rdsin != dev->rdsout)
 		readbuf[i++] = dev->rdsbuf[dev->rdsout++];
+	mutex_unlock(&dev->lock);
 
 	if (i && copy_to_user(data, readbuf, i))
-		i = -EFAULT;
-unlock:
-	mutex_unlock(&dev->lock);
+		return -EFAULT;
 	return i;
 }
 
@@ -352,7 +360,7 @@
 {
 	strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
 	strlcpy(v->card, "ADS Cadet", sizeof(v->card));
-	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
+	strlcpy(v->bus_info, "ISA:radio-cadet", sizeof(v->bus_info));
 	v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
 			  V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
 	v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
@@ -491,7 +499,7 @@
 			cadet_start_rds(dev);
 		mutex_unlock(&dev->lock);
 	}
-	if (dev->rdsin != dev->rdsout)
+	if (cadet_has_rds_data(dev))
 		res |= POLLIN | POLLRDNORM;
 	return res;
 }
@@ -642,7 +650,6 @@
 	dev->vdev.ioctl_ops = &cadet_ioctl_ops;
 	dev->vdev.release = video_device_release_empty;
 	dev->vdev.lock = &dev->lock;
-	set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
 	video_set_drvdata(&dev->vdev, dev);
 
 	res = video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr);