diff --git a/drivers/media/pci/ivtv/ivtv-driver.c b/drivers/media/pci/ivtv/ivtv-driver.c
index 8616fa8193bc..c2e60b4f292d 100644
--- a/drivers/media/pci/ivtv/ivtv-driver.c
+++ b/drivers/media/pci/ivtv/ivtv-driver.c
@@ -805,11 +805,11 @@ static void ivtv_init_struct2(struct ivtv *itv)
 {
 	int i;
 
-	for (i = 0; i < IVTV_CARD_MAX_VIDEO_INPUTS - 1; i++)
+	for (i = 0; i < IVTV_CARD_MAX_VIDEO_INPUTS; i++)
 		if (itv->card->video_inputs[i].video_type == 0)
 			break;
 	itv->nof_inputs = i;
-	for (i = 0; i < IVTV_CARD_MAX_AUDIO_INPUTS - 1; i++)
+	for (i = 0; i < IVTV_CARD_MAX_AUDIO_INPUTS; i++)
 		if (itv->card->audio_inputs[i].audio_type == 0)
 			break;
 	itv->nof_audio_inputs = i;
diff --git a/drivers/media/usb/airspy/airspy.c b/drivers/media/usb/airspy/airspy.c
index fcbb49757614..565a59310747 100644
--- a/drivers/media/usb/airspy/airspy.c
+++ b/drivers/media/usb/airspy/airspy.c
@@ -134,7 +134,7 @@ struct airspy {
 	int            urbs_submitted;
 
 	/* USB control message buffer */
-	#define BUF_SIZE 24
+	#define BUF_SIZE 128
 	u8 buf[BUF_SIZE];
 
 	/* Current configuration */
diff --git a/drivers/media/usb/hackrf/hackrf.c b/drivers/media/usb/hackrf/hackrf.c
index e05bfec90f46..0fe5cb2c260c 100644
--- a/drivers/media/usb/hackrf/hackrf.c
+++ b/drivers/media/usb/hackrf/hackrf.c
@@ -24,6 +24,15 @@
 #include <media/videobuf2-v4l2.h>
 #include <media/videobuf2-vmalloc.h>
 
+/*
+ * Used Avago MGA-81563 RF amplifier could be destroyed pretty easily with too
+ * strong signal or transmitting to bad antenna.
+ * Set RF gain control to 'grabbed' state by default for sure.
+ */
+static bool hackrf_enable_rf_gain_ctrl;
+module_param_named(enable_rf_gain_ctrl, hackrf_enable_rf_gain_ctrl, bool, 0644);
+MODULE_PARM_DESC(enable_rf_gain_ctrl, "enable RX/TX RF amplifier control (warn: could damage amplifier)");
+
 /* HackRF USB API commands (from HackRF Library) */
 enum {
 	CMD_SET_TRANSCEIVER_MODE           = 0x01,
@@ -1451,6 +1460,7 @@ static int hackrf_probe(struct usb_interface *intf,
 		dev_err(dev->dev, "Could not initialize controls\n");
 		goto err_v4l2_ctrl_handler_free_rx;
 	}
+	v4l2_ctrl_grab(dev->rx_rf_gain, !hackrf_enable_rf_gain_ctrl);
 	v4l2_ctrl_handler_setup(&dev->rx_ctrl_handler);
 
 	/* Register controls for transmitter */
@@ -1471,6 +1481,7 @@ static int hackrf_probe(struct usb_interface *intf,
 		dev_err(dev->dev, "Could not initialize controls\n");
 		goto err_v4l2_ctrl_handler_free_tx;
 	}
+	v4l2_ctrl_grab(dev->tx_rf_gain, !hackrf_enable_rf_gain_ctrl);
 	v4l2_ctrl_handler_setup(&dev->tx_ctrl_handler);
 
 	/* Register the v4l2_device structure */
@@ -1530,7 +1541,7 @@ static int hackrf_probe(struct usb_interface *intf,
 err_kfree:
 	kfree(dev);
 err:
-	dev_dbg(dev->dev, "failed=%d\n", ret);
+	dev_dbg(&intf->dev, "failed=%d\n", ret);
 	return ret;
 }