title: How to remove modules which are in use?
body: <p>I'm using ov5647 MIPI camera in raspberry pi,
  I make ov5640 driver as dynamic, now I try to remove ov5647 module with</p>
  <pre><code>sudo rmmod ov5647
  </code></pre>
  <p>but what I got is this:</p>
  <pre><code>$ sudo rmmod ov5647.ko
  rmmod: ERROR: Module ov5647 is in use
  </code></pre>
  <p>this is lsmod output:</p>
  <pre><code>$ lsmod | grep ov5647
  ov5647                 20480  1
  v4l2_fwnode            24576  2 bcm2835_unicam,ov5647
  v4l2_async             24576  3 bcm2835_unicam,v4l2_fwnode,ov5647
  videodev              249856  10 bcm2835_unicam,rpivid_hevc,bcm2835_isp,ov5647,bcm2835_codec,videobuf2_common,bcm2835_v4l2,v4l2_mem2mem,videobuf2_v4l2,v4l2_async
  mc                     49152  10 bcm2835_unicam,rpivid_hevc,bcm2835_isp,ov5647,bcm2835_codec,videobuf2_common,videodev,v4l2_mem2mem,videobuf2_v4l2,v4l2_async
  </code></pre>
  <p>how to remove ov5647 module which is in use?</p>