USB: gadget driver unbind() is optional; section fixes; misc

Allow gadget drivers to omit the unbind() method.  When they're
statically linked, that's an appropriate memory saving tweak.

Similarly, provide consistent/simpler handling for a should-not-happen
error case:  removing a peripheral controller driver when a gadget
driver is still loaded.  Such code dates back to early versions of the
first implementation of the gadget API, and has never been triggered.

Includes relevant section annotation fixs for gmidi.c, file_storage.c,
and serial.c; we don't yet have an "init or exit" annotation.  Also
some whitespace fixes in gmidi.c (space at EOL, before tabs, etc).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

10 files changed, 41 insertions, 47 deletions

diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 3e0abbb..8165633 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -1574,7 +1574,6 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
 	if (!driver
 			|| driver->speed != USB_SPEED_FULL
 			|| !driver->bind
-			|| !driver->unbind
 			|| !driver->setup) {
 		DBG("bad parameter.\n");
 		return -EINVAL;
@@ -1611,7 +1610,7 @@ int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 {
 	struct at91_udc *udc = &controller;
 
-	if (!driver || driver != udc->driver)
+	if (!driver || driver != udc->driver || !driver->unbind)
 		return -EINVAL;
 
 	local_irq_disable();
@@ -1731,10 +1730,10 @@ static int __devexit at91udc_remove(struct platform_device *pdev)
 
 	DBG("remove\n");
 
-	pullup(udc, 0);
+	if (udc->driver)
+		return -EBUSY;
 
-	if (udc->driver != 0)
-		usb_gadget_unregister_driver(udc->driver);
+	pullup(udc, 0);
 
 	device_init_wakeup(&pdev->dev, 0);
 	remove_debug_file(udc);
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index f1f32d7..3c2bc07 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -779,7 +779,7 @@ usb_gadget_register_driver (struct usb_gadget_driver *driver)
 		return -EINVAL;
 	if (dum->driver)
 		return -EBUSY;
-	if (!driver->bind || !driver->unbind || !driver->setup
+	if (!driver->bind || !driver->setup
 			|| driver->speed == USB_SPEED_UNKNOWN)
 		return -EINVAL;
 
@@ -837,7 +837,8 @@ usb_gadget_register_driver (struct usb_gadget_driver *driver)
 err_bind_driver:
 	driver_unregister (&driver->driver);
 err_register:
-	driver->unbind (&dum->gadget);
+	if (driver->unbind)
+		driver->unbind (&dum->gadget);
 	spin_lock_irq (&dum->lock);
 	dum->pullup = 0;
 	set_link_state (dum);
@@ -857,7 +858,7 @@ usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 
 	if (!dum)
 		return -ENODEV;
-	if (!driver || driver != dum->driver)
+	if (!driver || driver != dum->driver || !driver->unbind)
 		return -EINVAL;
 
 	dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index a265e26..72f2ae9 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -4100,7 +4100,7 @@ static struct usb_gadget_driver		fsg_driver = {
 #endif
 	.function	= (char *) longname,
 	.bind		= fsg_bind,
-	.unbind		= __exit_p(fsg_unbind),
+	.unbind		= fsg_unbind,
 	.disconnect	= fsg_disconnect,
 	.setup		= fsg_setup,
 	.suspend	= fsg_suspend,
diff --git a/drivers/usb/gadget/gmidi.c b/drivers/usb/gadget/gmidi.c
index 3135182..f1a67965 100644
--- a/drivers/usb/gadget/gmidi.c
+++ b/drivers/usb/gadget/gmidi.c
@@ -123,7 +123,7 @@ struct gmidi_device {
 	struct usb_request	*req;		/* for control responses */
 	u8			config;
 	struct usb_ep		*in_ep, *out_ep;
-	struct snd_card 	*card;
+	struct snd_card		*card;
 	struct snd_rawmidi	*rmidi;
 	struct snd_rawmidi_substream *in_substream;
 	struct snd_rawmidi_substream *out_substream;
@@ -490,7 +490,7 @@ static void gmidi_complete(struct usb_ep *ep, struct usb_request *req)
 	int status = req->status;
 
 	switch (status) {
-	case 0: 			/* normal completion */
+	case 0:				/* normal completion */
 		if (ep == dev->out_ep) {
 			/* we received stuff.
 			   req is queued again, below */
@@ -505,7 +505,7 @@ static void gmidi_complete(struct usb_ep *ep, struct usb_request *req)
 		break;
 
 	/* this endpoint is normally active while we're configured */
-	case -ECONNABORTED: 		/* hardware forced ep reset */
+	case -ECONNABORTED:		/* hardware forced ep reset */
 	case -ECONNRESET:		/* request dequeued */
 	case -ESHUTDOWN:		/* disconnect from host */
 		VDBG(dev, "%s gone (%d), %d/%d\n", ep->name, status,
@@ -656,7 +656,7 @@ gmidi_set_config(struct gmidi_device *dev, unsigned number, gfp_t gfp_flags)
 		case USB_SPEED_LOW:	speed = "low"; break;
 		case USB_SPEED_FULL:	speed = "full"; break;
 		case USB_SPEED_HIGH:	speed = "high"; break;
-		default: 		speed = "?"; break;
+		default:		speed = "?"; break;
 		}
 
 		dev->config = number;
@@ -1308,7 +1308,7 @@ static struct usb_gadget_driver gmidi_driver = {
 	.speed		= USB_SPEED_FULL,
 	.function	= (char *)longname,
 	.bind		= gmidi_bind,
-	.unbind		= __exit_p(gmidi_unbind),
+	.unbind		= gmidi_unbind,
 
 	.setup		= gmidi_setup,
 	.disconnect	= gmidi_disconnect,
@@ -1316,7 +1316,7 @@ static struct usb_gadget_driver gmidi_driver = {
 	.suspend	= gmidi_suspend,
 	.resume		= gmidi_resume,
 
-	.driver 	= {
+	.driver		= {
 		.name		= (char *)shortname,
 		.owner		= THIS_MODULE,
 	},
diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index 805a982..d0ef1d6 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -1432,7 +1432,6 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 	if (!driver
 			|| driver->speed != USB_SPEED_FULL
 			|| !driver->bind
-			|| !driver->unbind
 			|| !driver->disconnect
 			|| !driver->setup)
 		return -EINVAL;
@@ -1495,7 +1494,7 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 
 	if (!dev)
 		return -ENODEV;
-	if (!driver || driver != dev->driver)
+	if (!driver || driver != dev->driver || !driver->unbind)
 		return -EINVAL;
 
 	spin_lock_irqsave(&dev->lock, flags);
@@ -1808,13 +1807,8 @@ static void goku_remove(struct pci_dev *pdev)
 	struct goku_udc		*dev = pci_get_drvdata(pdev);
 
 	DBG(dev, "%s\n", __FUNCTION__);
-	/* start with the driver above us */
-	if (dev->driver) {
-		/* should have been done already by driver model core */
-		WARN(dev, "pci remove, driver '%s' is still registered\n",
-				dev->driver->driver.name);
-		usb_gadget_unregister_driver(dev->driver);
-	}
+
+	BUG_ON(dev->driver);
 
 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
 	remove_proc_entry(proc_node_name, NULL);
diff --git a/drivers/usb/gadget/lh7a40x_udc.c b/drivers/usb/gadget/lh7a40x_udc.c
index 4a99156..a0a73c0 100644
--- a/drivers/usb/gadget/lh7a40x_udc.c
+++ b/drivers/usb/gadget/lh7a40x_udc.c
@@ -422,9 +422,10 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 	DEBUG("%s: %s\n", __FUNCTION__, driver->driver.name);
 
 	if (!driver
-	    || driver->speed != USB_SPEED_FULL
-	    || !driver->bind
-	    || !driver->unbind || !driver->disconnect || !driver->setup)
+			|| driver->speed != USB_SPEED_FULL
+			|| !driver->bind
+			|| !driver->disconnect
+			|| !driver->setup)
 		return -EINVAL;
 	if (!dev)
 		return -ENODEV;
@@ -471,7 +472,7 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 
 	if (!dev)
 		return -ENODEV;
-	if (!driver || driver != dev->driver)
+	if (!driver || driver != dev->driver || !driver->unbind)
 		return -EINVAL;
 
 	spin_lock_irqsave(&dev->lock, flags);
@@ -2125,9 +2126,11 @@ static int lh7a40x_udc_remove(struct platform_device *pdev)
 
 	DEBUG("%s: %p\n", __FUNCTION__, pdev);
 
+	if (dev->driver)
+		return -EBUSY;
+
 	udc_disable(dev);
 	remove_proc_files();
-	usb_gadget_unregister_driver(dev->driver);
 
 	free_irq(IRQ_USBINTR, dev);
 
diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c
index 3024c67..569eb8c 100644
--- a/drivers/usb/gadget/net2280.c
+++ b/drivers/usb/gadget/net2280.c
@@ -2020,7 +2020,6 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
 	if (!driver
 			|| driver->speed != USB_SPEED_HIGH
 			|| !driver->bind
-			|| !driver->unbind
 			|| !driver->setup)
 		return -EINVAL;
 	if (!dev)
@@ -2107,7 +2106,7 @@ int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 
 	if (!dev)
 		return -ENODEV;
-	if (!driver || driver != dev->driver)
+	if (!driver || driver != dev->driver || !driver->unbind)
 		return -EINVAL;
 
 	spin_lock_irqsave (&dev->lock, flags);
@@ -2803,13 +2802,7 @@ static void net2280_remove (struct pci_dev *pdev)
 {
 	struct net2280		*dev = pci_get_drvdata (pdev);
 
-	/* start with the driver above us */
-	if (dev->driver) {
-		/* should have been done already by driver model core */
-		WARN (dev, "pci remove, driver '%s' is still registered\n",
-				dev->driver->driver.name);
-		usb_gadget_unregister_driver (dev->driver);
-	}
+	BUG_ON(dev->driver);
 
 	/* then clean up the resources we allocated during probe() */
 	net2280_led_shutdown (dev);
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index 030d87c..15d77c3 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -2043,7 +2043,6 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
 			// FIXME if otg, check:  driver->is_otg
 			|| driver->speed < USB_SPEED_FULL
 			|| !driver->bind
-			|| !driver->unbind
 			|| !driver->setup)
 		return -EINVAL;
 
@@ -2087,9 +2086,11 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
 		status = otg_set_peripheral(udc->transceiver, &udc->gadget);
 		if (status < 0) {
 			ERR("can't bind to transceiver\n");
-			driver->unbind (&udc->gadget);
-			udc->gadget.dev.driver = NULL;
-			udc->driver = NULL;
+			if (driver->unbind) {
+				driver->unbind (&udc->gadget);
+				udc->gadget.dev.driver = NULL;
+				udc->driver = NULL;
+			}
 			goto done;
 		}
 	} else {
@@ -2117,7 +2118,7 @@ int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 
 	if (!udc)
 		return -ENODEV;
-	if (!driver || driver != udc->driver)
+	if (!driver || driver != udc->driver || !driver->unbind)
 		return -EINVAL;
 
 	if (machine_is_omap_innovator() || machine_is_omap_osk())
@@ -2870,6 +2871,8 @@ static int __exit omap_udc_remove(struct platform_device *pdev)
 
 	if (!udc)
 		return -ENODEV;
+	if (udc->driver)
+		return -EBUSY;
 
 	udc->done = &done;
 
diff --git a/drivers/usb/gadget/pxa2xx_udc.c b/drivers/usb/gadget/pxa2xx_udc.c
index 1ed506e..b78de96 100644
--- a/drivers/usb/gadget/pxa2xx_udc.c
+++ b/drivers/usb/gadget/pxa2xx_udc.c
@@ -1623,7 +1623,6 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 	if (!driver
 			|| driver->speed < USB_SPEED_FULL
 			|| !driver->bind
-			|| !driver->unbind
 			|| !driver->disconnect
 			|| !driver->setup)
 		return -EINVAL;
@@ -1694,7 +1693,7 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 
 	if (!dev)
 		return -ENODEV;
-	if (!driver || driver != dev->driver)
+	if (!driver || driver != dev->driver || !driver->unbind)
 		return -EINVAL;
 
 	local_irq_disable();
@@ -2638,9 +2637,11 @@ static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
 {
 	struct pxa2xx_udc *dev = platform_get_drvdata(pdev);
 
+	if (dev->driver)
+		return -EBUSY;
+
 	udc_disable(dev);
 	remove_proc_files();
-	usb_gadget_unregister_driver(dev->driver);
 
 	if (dev->got_irq) {
 		free_irq(IRQ_USB, dev);
diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index 2d12bf9..f8a3ec6 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -296,7 +296,7 @@ static struct usb_gadget_driver gs_gadget_driver = {
 #endif /* CONFIG_USB_GADGET_DUALSPEED */
 	.function =		GS_LONG_NAME,
 	.bind =			gs_bind,
-	.unbind =		__exit_p(gs_unbind),
+	.unbind =		gs_unbind,
 	.setup =		gs_setup,
 	.disconnect =		gs_disconnect,
 	.driver = {