staging: comedi: usbduxsigma: Call mutex_destroy() on private mutex

`usbduxsigma_detach()` is the Comedi "detach" handler for the
usbduxsigma driver.  When it is called, the private data for the device
is about to be freed.  The private date contains a mutex `devpriv->mut`
that was initialized when the private data was allocated.  Call
`mutex_destroy()` to mark it as invalid.

The calls to `mutex_lock()` and `mutex_unlock()` in
`usbduxsigma_detach()` are probably not required, especially as the
mutex is about to be destroyed, but leave them alone for now.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c
index af5605a875e2c3aeeafe1a32fdfc01b83043ee9b..3cc40d2544be300d3827621cbd9cef98a655ab1a 100644 (file)
--- a/drivers/staging/comedi/drivers/usbduxsigma.c
+++ b/drivers/staging/comedi/drivers/usbduxsigma.c
@@ -1577,6 +1577,8 @@ static void usbduxsigma_detach(struct comedi_device *dev)
        usbduxsigma_free_usb_buffers(dev);
 
        mutex_unlock(&devpriv->mut);
+
+       mutex_destroy(&devpriv->mut);
 }
 
 static struct comedi_driver usbduxsigma_driver = {