[ARM] ecard: add helper function for setting ecard irq ops

Rather than having every driver fiddle about setting its private
IRQ operations and data, provide a helper function to contain
this functionality in one place.

Arrange to remove the driver-private IRQ operations and data when
the device is removed from the driver, and remove the driver
private code to do this.

This fixes potential problems caused by drivers forgetting to
remove these hooks.

Signed-off-by: Russell King <[e-mail]>

arch/arm/kernel/ecard.c

···
 }
 EXPORT_SYMBOL(ecard_release_resources);
 
+void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
+{
+	ec->irq_data = irq_data;
+	barrier();
+	ec->ops = ops;
+}
+EXPORT_SYMBOL(ecard_setirq);
+
 /*
  * Probe for an expansion card.
  *
···
 
 	drv->remove(ec);
 	ecard_release(ec);
+
+	/*
+	 * Restore the default operations.  We ensure that the
+	 * ops are set before we change the data.
+	 */
+	ec->ops = &ecard_default_ops;
+	barrier();
+	ec->irq_data = NULL;
 
 	return 0;
 }

drivers/ata/pata_icside.c

···
 
 	ec->irqaddr = base + ICS_ARCIN_V5_INTRSTAT;
 	ec->irqmask = 1;
-	ec->irq_data = state;
-	ec->ops = &pata_icside_ops_arcin_v5;
+
+	ecard_setirq(ec, &pata_icside_ops_arcin_v5, state);
 
 	/*
 	 * Be on the safe side - disable interrupts
···
 
 	writeb(sel, ioc_base);
 
-	ec->irq_data = state;
-	ec->ops = &pata_icside_ops_arcin_v6;
+	ecard_setirq(ec, &pata_icside_ops_arcin_v6, state);
 
 	state->irq_port = easi_base;
 	state->ioc_base = ioc_base;
···
 	 * this register via that region.
 	 */
 	local_irq_save(flags);
-	if (ec->ops)
-		ec->ops->irqdisable(ec, ec->irq);
+	ec->ops->irqdisable(ec, ec->irq);
 	local_irq_restore(flags);
 
 	/*
···
 	 * don't NULL out the drvdata - devres/libata wants it
 	 * to free the ata_host structure.
 	 */
-	ec->ops = NULL;
-	ec->irq_data = NULL;
-
 	if (state->dma != NO_DMA)
 		free_dma(state->dma);
 	if (state->ioc_base)

drivers/ide/arm/icside.c

···
 
 	ec->irqaddr  = base + ICS_ARCIN_V5_INTRSTAT;
 	ec->irqmask  = 1;
-	ec->irq_data = state;
-	ec->ops      = &icside_ops_arcin_v5;
+
+	ecard_setirq(ec, &icside_ops_arcin_v5, state);
 
 	/*
 	 * Be on the safe side - disable interrupts
···
 
 	writeb(sel, ioc_base);
 
-	ec->irq_data      = state;
-	ec->ops           = &icside_ops_arcin_v6;
+	ecard_setirq(ec, &icside_ops_arcin_v6, state);
 
 	state->irq_port   = easi_base;
 	state->ioc_base   = ioc_base;
···
 	}
 
 	ecard_set_drvdata(ec, NULL);
-	ec->ops = NULL;
-	ec->irq_data = NULL;
 
 	if (state->ioc_base)
 		iounmap(state->ioc_base);

drivers/net/arm/etherh.c

···
 	 * IRQ and control port handling - only for non-NIC slot cards.
 	 */
 	if (ec->slot_no != 8) {
-		ec->ops		= &etherh_ops;
-		ec->irq_data	= eh;
+		ecard_setirq(ec, &etherh_ops, eh);
 	} else {
 		/*
 		 * If we're in the NIC slot, make sure the IRQ is enabled
···
 	ecard_set_drvdata(ec, NULL);
 
 	unregister_netdev(dev);
-	ec->ops = NULL;
 
 	if (eh->ioc_fast)
 		iounmap(eh->ioc_fast);

drivers/scsi/arm/cumana_2.c

···
 
 	ec->irqaddr	= info->base + CUMANASCSI2_STATUS;
 	ec->irqmask	= STATUS_INT;
-	ec->irq_data	= info;
-	ec->ops		= &cumanascsi_2_ops;
+
+	ecard_setirq(ec, &cumanascsi_2_ops, info);
 
 	ret = fas216_init(host);
 	if (ret)

drivers/scsi/arm/eesox.c

···
 
 	ec->irqaddr	= base + EESOX_DMASTAT;
 	ec->irqmask	= EESOX_STAT_INTR;
-	ec->irq_data	= info;
-	ec->ops		= &eesoxscsi_ops;
+
+	ecard_setirq(ec, &eesoxscsi_ops, info);
 
 	device_create_file(&ec->dev, &dev_attr_bus_term);
 

drivers/scsi/arm/powertec.c

···
 
 	ec->irqaddr	= base + POWERTEC_INTR_STATUS;
 	ec->irqmask	= POWERTEC_INTR_BIT;
-	ec->irq_data	= info;
-	ec->ops		= &powertecscsi_ops;
+
+	ecard_setirq(ec, &powertecscsi_ops, info);
 
 	device_create_file(&ec->dev, &dev_attr_bus_term);
 

include/asm-arm/ecard.h

···
 typedef struct expansion_card ecard_t;
 typedef unsigned long *loader_t;
 
-typedef struct {			/* Card handler routines	*/
+typedef struct expansion_card_ops {	/* Card handler routines	*/
 	void (*irqenable)(ecard_t *ec, int irqnr);
 	void (*irqdisable)(ecard_t *ec, int irqnr);
 	int  (*irqpending)(ecard_t *ec);
···
 	CONST loader_t		loader;		/* loader program */
 	u64			dma_mask;
 };
+
+void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data);
 
 struct in_chunk_dir {
 	unsigned int start_offset;