diff --git a/drivers/media/rc/imon.c b/drivers/media/rc/imon.c
index c683a244b9fa8..d8401ef9b0a79 100644
--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -604,15 +604,14 @@ static int send_packet(struct imon_context *ictx)
 		pr_err_ratelimited("error submitting urb(%d)\n", retval);
 	} else {
 		/* Wait for transmission to complete (or abort) */
-		mutex_unlock(&ictx->lock);
 		retval = wait_for_completion_interruptible(
 				&ictx->tx.finished);
 		if (retval) {
 			usb_kill_urb(ictx->tx_urb);
 			pr_err_ratelimited("task interrupted\n");
 		}
-		mutex_lock(&ictx->lock);
 
+		ictx->tx.busy = false;
 		retval = ictx->tx.status;
 		if (retval)
 			pr_err_ratelimited("packet tx failed (%d)\n", retval);
@@ -919,7 +918,8 @@ static ssize_t vfd_write(struct file *file, const char __user *buf,
 		return -ENODEV;
 	}
 
-	mutex_lock(&ictx->lock);
+	if (mutex_lock_interruptible(&ictx->lock))
+		return -ERESTARTSYS;
 
 	if (!ictx->dev_present_intf0) {
 		pr_err_ratelimited("no iMON device present\n");