staging: comedi: usbduxsigma: Call mutex_destroy() on private mutex
authorIan Abbott <abbotti@mev.co.uk>
Wed, 17 Apr 2019 15:55:12 +0000 (16:55 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 19 Apr 2019 12:59:36 +0000 (14:59 +0200)
commit2cd0869672426171541330ecd7a39761a40b06a6
treed97e445034d7806ad00d185fd33fba377a692a3d
parenta5c795056c443fd5c5a60c840787a8990f6b24a4
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>
drivers/staging/comedi/drivers/usbduxsigma.c