linux-kernel - [PATCH] usb: gadget: langwell

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Message-Id: <1286423526-2777-1-git-send-email-rahul.ruikar@gmail.com>
Date:	Thu,  7 Oct 2010 09:22:06 +0530
From:	Rahul Ruikar <rahul.ruikar@...il.com>
To:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Joe Perches <joe@...ches.com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rahul Ruikar <rahul.ruikar@...il.com>
Subject: [PATCH] usb: gadget: langwell_udc: Fix error path

Fix for following cases
- Call device_unregister() only when device_register() succeeds.
- Call put_device() when device_register() fails.
- Call device_remove_file() only when device_create_file() succeeds.

Signed-off-by: Rahul Ruikar <rahul.ruikar@...il.com>
---
 drivers/usb/gadget/langwell_udc.c |   14 +++++++++++---
 drivers/usb/gadget/langwell_udc.h |    4 +++-
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c
index c2d2a20..56e216e 100644
--- a/drivers/usb/gadget/langwell_udc.c
+++ b/drivers/usb/gadget/langwell_udc.c
@@ -2952,8 +2952,11 @@ static void langwell_udc_remove(struct pci_dev *pdev)
 	INFO(dev, "unbind\n");
 	DBG(dev, "<--- %s()\n", __func__);
 
-	device_unregister(&dev->gadget.dev);
-	device_remove_file(&pdev->dev, &dev_attr_langwell_udc);
+	if (dev->reg_status)
+		device_unregister(&dev->gadget.dev);
+
+	if (dev->file_created)
+		device_remove_file(&pdev->dev, &dev_attr_langwell_udc);
 
 #ifndef	OTG_TRANSCEIVER
 	pci_set_drvdata(pdev, NULL);
@@ -3190,13 +3193,18 @@ static int langwell_udc_probe(struct pci_dev *pdev,
 	the_controller = dev;
 
 	retval = device_register(&dev->gadget.dev);
-	if (retval)
+	if (retval) {
+		put_device(&dev->gadget.dev);
 		goto error;
+	}
+	dev->reg_status = 1;
 
 	retval = device_create_file(&pdev->dev, &dev_attr_langwell_udc);
 	if (retval)
 		goto error;
 
+	dev->file_created = 1;
+
 	VDBG(dev, "<--- %s()\n", __func__);
 	return 0;
 
diff --git a/drivers/usb/gadget/langwell_udc.h b/drivers/usb/gadget/langwell_udc.h
index 9719934..da40671 100644
--- a/drivers/usb/gadget/langwell_udc.h
+++ b/drivers/usb/gadget/langwell_udc.h
@@ -199,7 +199,9 @@ struct langwell_udc {
 				vbus_active:1,
 				suspended:1,
 				stopped:1,
-				lpm:1;	/* LPM capability */
+				lpm:1,	/* LPM capability */
+				reg_status:1,
+				file_created:1;
 
 	/* pci state used to access those endpoints */
 	struct pci_dev		*pdev;
-- 
1.7.2.3

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