staging: comedi: usbduxfast: remove 'intf' from the private data

The usb_interface pointer is already saved in the comedi_device
by the comedi core.

Remove the pointer from the private data and use comedi_to_usb_interface()
to get the usb_interface when needed.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/usbduxfast.c b/drivers/staging/comedi/drivers/usbduxfast.c
index c87cc5a..e8dab2f 100644 (file)
--- a/drivers/staging/comedi/drivers/usbduxfast.c
+++ b/drivers/staging/comedi/drivers/usbduxfast.c
@@ -152,7 +152,6 @@ struct usbduxfast_private {
        struct urb *urbIn;      /* BULK-transfer handling: urb */
        int8_t *transfer_buffer;
        int16_t *insnBuffer;    /* input buffer for single insn */
-       struct usb_interface *intf;     /* interface structure */
        short int ai_cmd_running;       /* asynchronous command is running */
        short int ai_continous; /* continous acquisition */
        long int ai_sample_count;       /* number of samples to acquire */
@@ -1239,8 +1238,7 @@ static int usbduxfast_attach_common(struct comedi_device *dev)
 
 static int usbduxfast_request_firmware(struct comedi_device *dev)
 {
-       struct usbduxfast_private *devpriv = dev->private;
-       struct usb_interface *intf = devpriv->intf;
+       struct usb_interface *intf = comedi_to_usb_interface(dev);
        struct usb_device *usb = interface_to_usbdev(intf);
        const struct firmware *fw;
        int ret;
@@ -1276,7 +1274,6 @@ static int usbduxfast_auto_attach(struct comedi_device *dev,
 
        sema_init(&devpriv->sem, 1);
        devpriv->usb = usb;
-       devpriv->intf = intf;
        usb_set_intfdata(intf, devpriv);
 
        devpriv->dux_commands = kmalloc(SIZEOFDUXBUFFER, GFP_KERNEL);
@@ -1321,6 +1318,7 @@ static int usbduxfast_auto_attach(struct comedi_device *dev,
 
 static void usbduxfast_detach(struct comedi_device *dev)
 {
+       struct usb_interface *intf = comedi_to_usb_interface(dev);
        struct usbduxfast_private *devpriv = dev->private;
 
        if (!devpriv)
@@ -1328,8 +1326,7 @@ static void usbduxfast_detach(struct comedi_device *dev)
 
        down(&devpriv->sem);
 
-       if (devpriv->intf)
-               usb_set_intfdata(devpriv->intf, NULL);
+       usb_set_intfdata(intf, NULL);
 
        if (devpriv->urbIn) {
                /* waits until a running transfer is over */