[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 <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/ecard.c

@@ -958,6 +958,14 @@ void ecard_release_resources(struct expansion_card *ec)
 }
 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.
  *
@@ -1133,6 +1141,14 @@ static int ecard_drv_remove(struct device *dev)
 	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

@@ -434,8 +434,8 @@ pata_icside_register_v5(struct ata_probe_ent *ae, struct expansion_card *ec)
 
 	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
@@ -480,8 +480,7 @@ pata_icside_register_v6(struct ata_probe_ent *ae, struct expansion_card *ec)
 
 	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;
@@ -609,8 +608,7 @@ static void pata_icside_shutdown(struct expansion_card *ec)
 	 * 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);
 
 	/*
@@ -638,9 +636,6 @@ static void __devexit pata_icside_remove(struct expansion_card *ec)
 	 * 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

@@ -574,8 +574,8 @@ icside_register_v5(struct icside_state *state, struct expansion_card *ec)
 
 	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
@@ -630,8 +630,7 @@ icside_register_v6(struct icside_state *state, struct expansion_card *ec)
 
 	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;
@@ -793,8 +792,6 @@ static void __devexit icside_remove(struct expansion_card *ec)
 	}
 
 	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

@@ -710,8 +710,7 @@ etherh_probe(struct expansion_card *ec, const struct ecard_id *id)
 	 * 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
@@ -778,7 +777,6 @@ static void __devexit etherh_remove(struct expansion_card *ec)
 	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

@@ -450,8 +450,8 @@ cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id)
 
 	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

@@ -569,8 +569,8 @@ eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 
 	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

@@ -361,8 +361,8 @@ powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 
 	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

@@ -121,7 +121,7 @@ struct in_ecid {			/* Packed card ID information	*/
 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);
@@ -179,6 +179,8 @@ struct expansion_card {
 	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;
 	union {