diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c
index 69db2d430e4b..8abcfe2725ba 100644
--- a/drivers/staging/axis-fifo/axis-fifo.c
+++ b/drivers/staging/axis-fifo/axis-fifo.c
@@ -400,6 +400,7 @@ static ssize_t axis_fifo_read(struct file *f, char __user *buf,
 	}
 
 	bytes_available = ioread32(fifo->base_addr + XLLF_RLR_OFFSET);
+	words_available = bytes_available / sizeof(u32);
 	if (!bytes_available) {
 		dev_err(fifo->dt_device, "received a packet of length 0\n");
 		ret = -EIO;
@@ -410,7 +411,7 @@ static ssize_t axis_fifo_read(struct file *f, char __user *buf,
 		dev_err(fifo->dt_device, "user read buffer too small (available bytes=%zu user buffer bytes=%zu)\n",
 			bytes_available, len);
 		ret = -EINVAL;
-		goto end_unlock;
+		goto err_flush_rx;
 	}
 
 	if (bytes_available % sizeof(u32)) {
@@ -419,11 +420,9 @@ static ssize_t axis_fifo_read(struct file *f, char __user *buf,
 		 */
 		dev_err(fifo->dt_device, "received a packet that isn't word-aligned\n");
 		ret = -EIO;
-		goto end_unlock;
+		goto err_flush_rx;
 	}
 
-	words_available = bytes_available / sizeof(u32);
-
 	/* read data into an intermediate buffer, copying the contents
 	 * to userspace when the buffer is full
 	 */
@@ -435,18 +434,23 @@ static ssize_t axis_fifo_read(struct file *f, char __user *buf,
 			tmp_buf[i] = ioread32(fifo->base_addr +
 					      XLLF_RDFD_OFFSET);
 		}
+		words_available -= copy;
 
 		if (copy_to_user(buf + copied * sizeof(u32), tmp_buf,
 				 copy * sizeof(u32))) {
 			ret = -EFAULT;
-			goto end_unlock;
+			goto err_flush_rx;
 		}
 
 		copied += copy;
-		words_available -= copy;
 	}
+	mutex_unlock(&fifo->read_lock);
 
-	ret = bytes_available;
+	return bytes_available;
+
+err_flush_rx:
+	while (words_available--)
+		ioread32(fifo->base_addr + XLLF_RDFD_OFFSET);
 
 end_unlock:
 	mutex_unlock(&fifo->read_lock);