`dt9812_detach()` is the Comedi "detach" handler for the dt9812 driver.
When it is called, the private data for the device is about to be freed.
The private data contains a mutex `devpriv->mut` that was initialized
when the private data was allocated. Call `mutex_destroy()` to mark it
as invalid.
Also remove the calls to `mutex_lock()` and `mutex_unlock()` from
`dt9812_detach()` as the mutex is only being used around a call to
`usb_set_intfdata()` to clear the USB interface's driver data pointer.
The mutex lock seems redundant here, especially as it is about to be
destroyed.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
---
drivers/staging/comedi/drivers/dt9812.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/staging/comedi/drivers/dt9812.c b/drivers/staging/comedi/drivers/dt9812.c
index 9f165f1cefa5..634f57730c1e 100644
--- a/drivers/staging/comedi/drivers/dt9812.c
+++ b/drivers/staging/comedi/drivers/dt9812.c
@@ -835,11 +835,8 @@ static void dt9812_detach(struct comedi_device *dev)
if (!devpriv)
return;
- mutex_lock(&devpriv->mut);
-
+ mutex_destroy(&devpriv->mut);
usb_set_intfdata(intf, NULL);
-
- mutex_unlock(&devpriv->mut);
}
static struct comedi_driver dt9812_driver = {
--
2.20.1
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