staging: comedi: drivers: free_irq() in comedi_legacy_detach()

All the legacy comedi drivers now call comedi_legacy_detach()
either directly or as part of their (*detach). Move the free_irq()
into comedi_legacy_detach() so that the drivers don't have to
deal with it.

For drivers that then only call comedi_legacy_detach() in their
private (*detach), remove the private function and use the helper
directly for the (*detach).

The amplc_pc236 and ni_labpc drivers are hybrid legacy/PCI drivers.
In the detach of a PCI board free_irq() still needs to be handled
by the driver.

The pcl724 and pcl726 drivers currently have the free_irq() #ifdef'ed
out. The comedi_legacy_detach() function sanity checks that the irq
has been requested before freeing it so they are safe to convert.

For aesthetic reasons, move the #ifdef unused chunk in the pcl816
driver up to the previous #ifdef unused block.

The pcmio and pcmuio drivers request multiple irqs and handle the
freeing of them. Remove the 'dev->irq = irq[0]' in those drivers
so that comedi_legacy_detach() does not attempt to free the irq.

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.c

@@ -37,6 +37,7 @@
 #include <linux/cdev.h>
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
+#include <linux/interrupt.h>
 
 #include "comedidev.h"
 #include "comedi_internal.h"
@@ -403,6 +404,10 @@ EXPORT_SYMBOL_GPL(comedi_request_region);
  */
 void comedi_legacy_detach(struct comedi_device *dev)
 {
+	if (dev->irq) {
+		free_irq(dev->irq, dev);
+		dev->irq = 0;
+	}
 	if (dev->iobase && dev->iolen) {
 		release_region(dev->iobase, dev->iolen);
 		dev->iobase = 0;

drivers/staging/comedi/drivers/amplc_pc236.c

@@ -543,13 +543,13 @@ static void pc236_detach(struct comedi_device *dev)
 		return;
 	if (dev->iobase)
 		pc236_intr_disable(dev);
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	comedi_spriv_free(dev, 0);
 	if (is_isa_board(thisboard)) {
 		comedi_legacy_detach(dev);
 	} else if (is_pci_board(thisboard)) {
 		struct pci_dev *pcidev = comedi_to_pci_dev(dev);
+		if (dev->irq)
+			free_irq(dev->irq, dev);
 		comedi_pci_disable(dev);
 		if (pcidev)
 			pci_dev_put(pcidev);

drivers/staging/comedi/drivers/comedi_parport.c

@@ -338,18 +338,11 @@ static int parport_attach(struct comedi_device *dev,
 	return 0;
 }
 
-static void parport_detach(struct comedi_device *dev)
-{
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-	comedi_legacy_detach(dev);
-}
-
 static struct comedi_driver parport_driver = {
 	.driver_name	= "comedi_parport",
 	.module		= THIS_MODULE,
 	.attach		= parport_attach,
-	.detach		= parport_detach,
+	.detach		= comedi_legacy_detach,
 };
 module_comedi_driver(parport_driver);
 

drivers/staging/comedi/drivers/das16.c

@@ -1354,8 +1354,6 @@ static void das16_detach(struct comedi_device *dev)
 		kfree(devpriv->user_ai_range_table);
 		kfree(devpriv->user_ao_range_table);
 	}
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	if (devpriv->extra_iobase)
 		release_region(devpriv->extra_iobase, board->size & 0x3ff);
 	comedi_legacy_detach(dev);

drivers/staging/comedi/drivers/das16m1.c

@@ -673,8 +673,6 @@ static void das16m1_detach(struct comedi_device *dev)
 	struct das16m1_private_struct *devpriv = dev->private;
 
 	comedi_spriv_free(dev, 3);
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	if (devpriv && devpriv->extra_iobase)
 		release_region(devpriv->extra_iobase, DAS16M1_SIZE2);
 	comedi_legacy_detach(dev);

drivers/staging/comedi/drivers/das1800.c

@@ -1668,8 +1668,6 @@ static void das1800_detach(struct comedi_device *dev)
 {
 	struct das1800_private *devpriv = dev->private;
 
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	if (devpriv) {
 		if (devpriv->dma0)
 			free_dma(devpriv->dma0);

drivers/staging/comedi/drivers/das6402.c

@@ -324,18 +324,11 @@ static int das6402_attach(struct comedi_device *dev,
 	return 0;
 }
 
-static void das6402_detach(struct comedi_device *dev)
-{
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-	comedi_legacy_detach(dev);
-}
-
 static struct comedi_driver das6402_driver = {
 	.driver_name	= "das6402",
 	.module		= THIS_MODULE,
 	.attach		= das6402_attach,
-	.detach		= das6402_detach,
+	.detach		= comedi_legacy_detach,
 };
 module_comedi_driver(das6402_driver)
 

drivers/staging/comedi/drivers/das800.c

@@ -230,14 +230,13 @@ struct das800_private {
 
 static int das800_attach(struct comedi_device *dev,
 			 struct comedi_devconfig *it);
-static void das800_detach(struct comedi_device *dev);
 static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
 
 static struct comedi_driver driver_das800 = {
 	.driver_name = "das800",
 	.module = THIS_MODULE,
 	.attach = das800_attach,
-	.detach = das800_detach,
+	.detach = comedi_legacy_detach,
 	.num_names = ARRAY_SIZE(das800_boards),
 	.board_name = &das800_boards[0].name,
 	.offset = sizeof(struct das800_board),
@@ -522,13 +521,6 @@ static int das800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	return 0;
 };
 
-static void das800_detach(struct comedi_device *dev)
-{
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-	comedi_legacy_detach(dev);
-}
-
 static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
 {
 	struct das800_private *devpriv = dev->private;

drivers/staging/comedi/drivers/dmm32at.c

@@ -820,18 +820,11 @@ static int dmm32at_attach(struct comedi_device *dev,
 
 }
 
-static void dmm32at_detach(struct comedi_device *dev)
-{
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-	comedi_legacy_detach(dev);
-}
-
 static struct comedi_driver dmm32at_driver = {
 	.driver_name	= "dmm32at",
 	.module		= THIS_MODULE,
 	.attach		= dmm32at_attach,
-	.detach		= dmm32at_detach,
+	.detach		= comedi_legacy_detach,
 };
 module_comedi_driver(dmm32at_driver);
 

drivers/staging/comedi/drivers/dt2811.c

@@ -556,13 +556,6 @@ static int dt2811_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	return 0;
 }
 
-static void dt2811_detach(struct comedi_device *dev)
-{
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-	comedi_legacy_detach(dev);
-}
-
 static const struct dt2811_board boardtypes[] = {
 	{
 		.name		= "dt2811-pgh",
@@ -581,7 +574,7 @@ static struct comedi_driver dt2811_driver = {
 	.driver_name	= "dt2811",
 	.module		= THIS_MODULE,
 	.attach		= dt2811_attach,
-	.detach		= dt2811_detach,
+	.detach		= comedi_legacy_detach,
 	.board_name	= &boardtypes[0].name,
 	.num_names	= ARRAY_SIZE(boardtypes),
 	.offset		= sizeof(struct dt2811_board),

drivers/staging/comedi/drivers/dt2814.c

@@ -323,18 +323,11 @@ static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	return 0;
 }
 
-static void dt2814_detach(struct comedi_device *dev)
-{
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-	comedi_legacy_detach(dev);
-}
-
 static struct comedi_driver dt2814_driver = {
 	.driver_name	= "dt2814",
 	.module		= THIS_MODULE,
 	.attach		= dt2814_attach,
-	.detach		= dt2814_detach,
+	.detach		= comedi_legacy_detach,
 };
 module_comedi_driver(dt2814_driver);
 

drivers/staging/comedi/drivers/dt282x.c

@@ -1271,8 +1271,6 @@ static void dt282x_detach(struct comedi_device *dev)
 {
 	struct dt282x_private *devpriv = dev->private;
 
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	if (dev->private) {
 		if (devpriv->dma[0].chan)
 			free_dma(devpriv->dma[0].chan);

drivers/staging/comedi/drivers/ni_at_a2150.c

@@ -829,8 +829,6 @@ static void a2150_detach(struct comedi_device *dev)
 
 	if (dev->iobase)
 		outw(APD_BIT | DPD_BIT, dev->iobase + CONFIG_REG);
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	if (devpriv) {
 		if (devpriv->dma)
 			free_dma(devpriv->dma);

drivers/staging/comedi/drivers/ni_atmio.c

@@ -499,8 +499,6 @@ static void ni_atmio_detach(struct comedi_device *dev)
 	struct ni_private *devpriv = dev->private;
 
 	mio_common_detach(dev);
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	comedi_legacy_detach(dev);
 	if (devpriv->isapnp_dev)
 		pnp_device_detach(devpriv->isapnp_dev);

drivers/staging/comedi/drivers/ni_atmio16d.c

@@ -768,8 +768,6 @@ static int atmio16d_attach(struct comedi_device *dev,
 static void atmio16d_detach(struct comedi_device *dev)
 {
 	comedi_spriv_free(dev, 3);
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	reset_atmio16d(dev);
 	comedi_legacy_detach(dev);
 }

drivers/staging/comedi/drivers/ni_labpc.c

@@ -1870,8 +1870,6 @@ void labpc_common_detach(struct comedi_device *dev)
 	if (devpriv->dma_chan)
 		free_dma(devpriv->dma_chan);
 #endif
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	if (board->bustype == isa_bustype)
 		comedi_legacy_detach(dev);
 #ifdef CONFIG_COMEDI_PCI_DRIVERS
@@ -1879,8 +1877,11 @@ void labpc_common_detach(struct comedi_device *dev)
 		mite_unsetup(devpriv->mite);
 		mite_free(devpriv->mite);
 	}
-	if (board->bustype == pci_bustype)
+	if (board->bustype == pci_bustype) {
+		if (dev->irq)
+			free_irq(dev->irq, dev);
 		comedi_pci_disable(dev);
+	}
 #endif
 }
 EXPORT_SYMBOL_GPL(labpc_common_detach);

drivers/staging/comedi/drivers/pcl711.c

@@ -550,13 +550,6 @@ static int pcl711_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	return 0;
 }
 
-static void pcl711_detach(struct comedi_device *dev)
-{
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-	comedi_legacy_detach(dev);
-}
-
 static const struct pcl711_board boardtypes[] = {
 	{ "pcl711", 0, 0, 0, 5, 8, 1, 0, &range_bipolar5 },
 	{ "pcl711b", 1, 0, 0, 5, 8, 1, 7, &range_pcl711b_ai },
@@ -568,7 +561,7 @@ static struct comedi_driver pcl711_driver = {
 	.driver_name	= "pcl711",
 	.module		= THIS_MODULE,
 	.attach		= pcl711_attach,
-	.detach		= pcl711_detach,
+	.detach		= comedi_legacy_detach,
 	.board_name	= &boardtypes[0].name,
 	.num_names	= ARRAY_SIZE(boardtypes),
 	.offset		= sizeof(struct pcl711_board),

drivers/staging/comedi/drivers/pcl724.c

@@ -173,10 +173,6 @@ static void pcl724_detach(struct comedi_device *dev)
 
 	for (i = 0; i < dev->n_subdevices; i++)
 		comedi_spriv_free(dev, i);
-#ifdef PCL724_IRQ
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-#endif
 	comedi_legacy_detach(dev);
 }
 

drivers/staging/comedi/drivers/pcl726.c

@@ -335,20 +335,11 @@ static int pcl726_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	return 0;
 }
 
-static void pcl726_detach(struct comedi_device *dev)
-{
-#ifdef ACL6126_IRQ
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-#endif
-	comedi_legacy_detach(dev);
-}
-
 static struct comedi_driver pcl726_driver = {
 	.driver_name	= "pcl726",
 	.module		= THIS_MODULE,
 	.attach		= pcl726_attach,
-	.detach		= pcl726_detach,
+	.detach		= comedi_legacy_detach,
 	.board_name	= &boardtypes[0].name,
 	.num_names	= ARRAY_SIZE(boardtypes),
 	.offset		= sizeof(struct pcl726_board),

drivers/staging/comedi/drivers/pcl812.c

@@ -1438,8 +1438,6 @@ static void pcl812_detach(struct comedi_device *dev)
 		if (devpriv->dma)
 			free_dma(devpriv->dma);
 	}
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	comedi_legacy_detach(dev);
 }
 

drivers/staging/comedi/drivers/pcl816.c

@@ -1214,14 +1214,10 @@ static void pcl816_detach(struct comedi_device *dev)
 				release_region(devpriv->rtc_iobase,
 					       devpriv->rtc_iosize);
 		}
+		if (devpriv->dma_rtc)
+			RTC_lock--;
 #endif
 	}
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-#ifdef unused
-	if (devpriv->dma_rtc)
-		RTC_lock--;
-#endif
 	comedi_legacy_detach(dev);
 }
 

drivers/staging/comedi/drivers/pcl818.c

@@ -1898,8 +1898,6 @@ static void pcl818_detach(struct comedi_device *dev)
 			RTC_lock--;
 #endif
 	}
-	if (dev->irq)
-		free_irq(dev->irq, dev);
 	comedi_legacy_detach(dev);
 }
 

drivers/staging/comedi/drivers/pcmad.c

@@ -133,13 +133,6 @@ static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	return 0;
 }
 
-static void pcmad_detach(struct comedi_device *dev)
-{
-	if (dev->irq)
-		free_irq(dev->irq, dev);
-	comedi_legacy_detach(dev);
-}
-
 static const struct pcmad_board_struct pcmad_boards[] = {
 	{
 		.name		= "pcmad12",
@@ -153,7 +146,7 @@ static struct comedi_driver pcmad_driver = {
 	.driver_name	= "pcmad",
 	.module		= THIS_MODULE,
 	.attach		= pcmad_attach,
-	.detach		= pcmad_detach,
+	.detach		= comedi_legacy_detach,
 	.board_name	= &pcmad_boards[0].name,
 	.num_names	= ARRAY_SIZE(pcmad_boards),
 	.offset		= sizeof(pcmad_boards[0]),

drivers/staging/comedi/drivers/pcmmio.c

@@ -1193,11 +1193,6 @@ static int pcmmio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 		devpriv->asics[asic].irq = irq[asic];
 	}
 
-	dev->irq = irq[0];	/*
-				 * grr.. wish comedi dev struct supported
-				 * multiple irqs..
-				 */
-
 	return 1;
 }
 

drivers/staging/comedi/drivers/pcmuio.c

@@ -917,9 +917,6 @@ static int pcmuio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 		devpriv->asics[asic].irq = irq[asic];
 	}
 
-	dev->irq = irq[0];	/* grr.. wish comedi dev struct supported multiple
-				   irqs.. */
-
 	if (irq[0]) {
 		dev_dbg(dev->class_dev, "irq: %u\n", irq[0]);
 		if (irq[1] && board->num_asics == 2)