staging: comedi: ni_labpc_common: move comedi_alloc_devpriv() to common code

The ni_labpc_common module is used by the ni_labpc, ni_labpc_pci, and ni_labpc_cs
drivers to provide the common code support. Those drivers currently all call
comedi_alloc_devpriv() to allocate the private data before calling the common
attach function.

For aesthetics, move the private data allocation into the common code.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_labpc.c

@@ -84,15 +84,10 @@ static const struct labpc_boardinfo labpc_boards[] = {
 
 static int labpc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
-	struct labpc_private *devpriv;
 	unsigned int irq = it->options[1];
 	unsigned int dma_chan = it->options[2];
 	int ret;
 
-	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
-	if (!devpriv)
-		return -ENOMEM;
-
 	ret = comedi_request_region(dev, it->options[0], 0x20);
 	if (ret)
 		return ret;

drivers/staging/comedi/drivers/ni_labpc_common.c

@@ -1215,11 +1215,15 @@ int labpc_common_attach(struct comedi_device *dev,
 			unsigned int irq, unsigned long isr_flags)
 {
 	const struct labpc_boardinfo *board = dev->board_ptr;
-	struct labpc_private *devpriv = dev->private;
+	struct labpc_private *devpriv;
 	struct comedi_subdevice *s;
 	int ret;
 	int i;
 
+	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
+	if (!devpriv)
+		return -ENOMEM;
+
 	if (dev->mmio) {
 		devpriv->read_byte = labpc_readb;
 		devpriv->write_byte = labpc_writeb;

drivers/staging/comedi/drivers/ni_labpc_cs.c

@@ -80,7 +80,6 @@ static int labpc_auto_attach(struct comedi_device *dev,
 			     unsigned long context)
 {
 	struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
-	struct labpc_private *devpriv;
 	int ret;
 
 	/* The ni_labpc driver needs the board_ptr */
@@ -96,10 +95,6 @@ static int labpc_auto_attach(struct comedi_device *dev,
 	if (!link->irq)
 		return -EINVAL;
 
-	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
-	if (!devpriv)
-		return -ENOMEM;
-
 	return labpc_common_attach(dev, link->irq, IRQF_SHARED);
 }
 

drivers/staging/comedi/drivers/ni_labpc_pci.c

@@ -79,7 +79,6 @@ static int labpc_pci_auto_attach(struct comedi_device *dev,
 {
 	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 	const struct labpc_boardinfo *board = NULL;
-	struct labpc_private *devpriv;
 	int ret;
 
 	if (context < ARRAY_SIZE(labpc_pci_boards))
@@ -101,10 +100,6 @@ static int labpc_pci_auto_attach(struct comedi_device *dev,
 	if (!dev->mmio)
 		return -ENOMEM;
 
-	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
-	if (!devpriv)
-		return -ENOMEM;
-
 	return labpc_common_attach(dev, pcidev->irq, IRQF_SHARED);
 }