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authorDan Carpenter <error27@gmail.com>2010-10-05 20:55:34 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 21:22:04 +0400
commit319feaabb6c7ccd90da6e3207563c265da7d21ae (patch)
tree07998aec5e760ec294566b5facac1ff60d0eb6c8 /drivers/usb/gadget/goku_udc.c
parentd0cc3d4100e829d726d7c0fbf5b7b8d2146f60ba (diff)
downloadlinux-319feaabb6c7ccd90da6e3207563c265da7d21ae.tar.xz
usb: gadget: goku_udc: Fix error path
This is based on an initial patch by Rahul Ruikar. The goku_remove() function can be called before device_register() so it can call device_unregister() improperly. Also if the call to device_register() fails we need to call put_device(). As I was changing the error handling in goku_probe(), I noticed that the label was "done" but actually if the function succeeds we return earlier. I renamed the error path to "err" instead of "done." Reported-by: Rahul Ruikar <rahul.ruikar@gmail.com> Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/goku_udc.c')
-rw-r--r--drivers/usb/gadget/goku_udc.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index 49fbd4dbeb94..48a760220baf 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -1745,7 +1745,8 @@ static void goku_remove(struct pci_dev *pdev)
pci_resource_len (pdev, 0));
if (dev->enabled)
pci_disable_device(pdev);
- device_unregister(&dev->gadget.dev);
+ if (dev->registered)
+ device_unregister(&dev->gadget.dev);
pci_set_drvdata(pdev, NULL);
dev->regs = NULL;
@@ -1775,7 +1776,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (!pdev->irq) {
printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
retval = -ENODEV;
- goto done;
+ goto err;
}
/* alloc, and start init */
@@ -1783,7 +1784,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (dev == NULL){
pr_debug("enomem %s\n", pci_name(pdev));
retval = -ENOMEM;
- goto done;
+ goto err;
}
spin_lock_init(&dev->lock);
@@ -1801,7 +1802,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
retval = pci_enable_device(pdev);
if (retval < 0) {
DBG(dev, "can't enable, %d\n", retval);
- goto done;
+ goto err;
}
dev->enabled = 1;
@@ -1810,7 +1811,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (!request_mem_region(resource, len, driver_name)) {
DBG(dev, "controller already in use\n");
retval = -EBUSY;
- goto done;
+ goto err;
}
dev->got_region = 1;
@@ -1818,7 +1819,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (base == NULL) {
DBG(dev, "can't map memory\n");
retval = -EFAULT;
- goto done;
+ goto err;
}
dev->regs = (struct goku_udc_regs __iomem *) base;
@@ -1834,7 +1835,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
driver_name, dev) != 0) {
DBG(dev, "request interrupt %d failed\n", pdev->irq);
retval = -EBUSY;
- goto done;
+ goto err;
}
dev->got_irq = 1;
if (use_dma)
@@ -1845,13 +1846,16 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
#endif
- /* done */
the_controller = dev;
retval = device_register(&dev->gadget.dev);
- if (retval == 0)
- return 0;
+ if (retval) {
+ put_device(&dev->gadget.dev);
+ goto err;
+ }
+ dev->registered = 1;
+ return 0;
-done:
+err:
if (dev)
goku_remove (pdev);
return retval;