bcma: unregister gpios before unloading bcma

This patch unregisters the gpio chip before bcma gets unloaded.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Reported-by: Piotr Haber <phaber@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/bcma/bcma_private.h

@@ -94,11 +94,16 @@ void __devinit bcma_core_pci_hostmode_init(struct bcma_drv_pci *pc);
 #ifdef CONFIG_BCMA_DRIVER_GPIO
 /* driver_gpio.c */
 int bcma_gpio_init(struct bcma_drv_cc *cc);
+int bcma_gpio_unregister(struct bcma_drv_cc *cc);
 #else
 static inline int bcma_gpio_init(struct bcma_drv_cc *cc)
 {
 	return -ENOTSUPP;
 }
+static inline int bcma_gpio_unregister(struct bcma_drv_cc *cc)
+{
+	return 0;
+}
 #endif /* CONFIG_BCMA_DRIVER_GPIO */
 
 #endif

drivers/bcma/driver_gpio.c

@@ -96,3 +96,8 @@ int bcma_gpio_init(struct bcma_drv_cc *cc)
 
 	return gpiochip_add(chip);
 }
+
+int bcma_gpio_unregister(struct bcma_drv_cc *cc)
+{
+	return gpiochip_remove(&cc->gpio);
+}

drivers/bcma/main.c

@@ -268,6 +268,13 @@ int __devinit bcma_bus_register(struct bcma_bus *bus)
 void bcma_bus_unregister(struct bcma_bus *bus)
 {
 	struct bcma_device *cores[3];
+	int err;
+
+	err = bcma_gpio_unregister(&bus->drv_cc);
+	if (err == -EBUSY)
+		bcma_err(bus, "Some GPIOs are still in use.\n");
+	else if (err)
+		bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
 
 	cores[0] = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 	cores[1] = bcma_find_core(bus, BCMA_CORE_PCIE);