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usb: Clean up newly allocated device nodes in case of configuration failure 

If probe of a newly connected device fails for some reason, clean up
the allocated entry in usb_dev array.

Signed-off-by: Milind Choudhary <milindc@codeaurora.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Milind Choudhary 2012-12-12 17:55:28 -08:00 committed by Marek Vasut
parent b6d7852cf8
commit 359439d288
3 changed files with 15 additions and 0 deletions
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12
common/usb.c
View File

@ -805,6 +805,18 @@ struct usb_device *usb_alloc_new_device(void *controller)
return &usb_dev[dev_index - 1];
}
/*
* Free the newly created device node.
* Called in error cases where configuring a newly attached
* device fails for some reason.
*/
void usb_free_device(void)
{
dev_index--;
USB_PRINTF("Freeing device node: %d\n", dev_index);
memset(&usb_dev[dev_index], 0, sizeof(struct usb_device));
usb_dev[dev_index].devnum = -1;
}
/*
* By the time we get here, the device has gotten a new device ID

2
common/usb_hub.c
View File

@ -259,6 +259,8 @@ void usb_hub_port_connect_change(struct usb_device *dev, int port)
/* Run it through the hoops (find a driver, etc) */
if (usb_new_device(usb)) {
/* Woops, disable the port */
usb_free_device();
dev->children[port] = NULL;
USB_HUB_PRINTF("hub: disabling port %d\n", port + 1);
usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
}

1
include/usb.h
View File

@ -392,5 +392,6 @@ int hub_port_reset(struct usb_device *dev, int port,
struct usb_device *usb_alloc_new_device(void *controller);
int usb_new_device(struct usb_device *dev);
void usb_free_device(void);
#endif /*_USB_H_ */