1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index 15b5f06fb0b3..c3e764909fd0 100644
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -495,11 +495,11 @@ static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
                 retval = -EFAULT;
                 goto unlock_exit;
         }
-        dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
-
         retval = bytes_to_read;
 
         spin_lock_irq(&dev->rbsl);
+        dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
+
         if (dev->buffer_overflow) {
                 dev->buffer_overflow = 0;
                 spin_unlock_irq(&dev->rbsl);